Filed Pursuant to Rule 424(b)(5)

Registration No. 333-128187

SUBJECT TO COMPLETION, DATED MAY 15, 2006

PRELIMINARY PROSPECTUS SUPPLEMENT

(To Prospectus Dated September 14, 2005)

$325,000,000

CenterPoint Energy Resources Corp.

% Senior Notes due 2016

       The notes will bear interest at a rate of      % per year from the date of issuance to, but excluding, May 1, 2016, when they will mature. We will pay interest on the notes on May 1 and November 1 of each year, beginning on November 1, 2006. The notes are subject to optional redemption prior to maturity as described under the caption “Description of the Notes — Optional Redemption.”

      The notes will be unsecured and will rank on a parity with all of our other unsecured and unsubordinated indebtedness.

       Investing in the notes involves risks. See “Risk Factors” beginning on page S-4 of this prospectus supplement.

       Neither the Securities and Exchange Commission nor any state securities commission has approved or disapproved of these securities or determined if this prospectus supplement or the accompanying prospectus is truthful or complete. Any representation to the contrary is a criminal offense.

      The underwriters expect to deliver the notes to purchasers in New York, New York on or about May      , 2006 through the book-entry facilities of the Depository Trust Company.

RBS Greenwich Capital

SunTrust Robinson Humphrey

Wells Fargo Securities

Prospectus Supplement dated May      , 2006.

      You should rely only on the information contained or incorporated by reference in this prospectus supplement, the accompanying prospectus and any written communication from us or the underwriters specifying the final terms of the offering. We have not, and the underwriters have not, authorized anyone to provide you with different information. If anyone provides you with different or inconsistent information, you should not rely on it. We are not making an offer to sell the notes and are not soliciting an offer to buy the notes in any state where the offer or sale is not permitted. You should assume that the information we have included in this prospectus supplement or the accompanying prospectus is accurate only as of the date of this prospectus supplement or the accompanying prospectus, as the case may be, and that any information we have incorporated by reference is accurate only as of the date of the document incorporated by reference. If the information varies between this prospectus supplement and the accompanying prospectus, the information in this prospectus supplement supersedes the information in the accompanying prospectus.

Table of Contents

Prospectus Supplement

Issuer		CenterPoint Energy Resources Corp.
Notes Offered		$325 million aggregate principal amount of      % senior notes due 2016.
Maturity Date		May 1, 2016.
Interest Payment Dates		May 1 and November 1, commencing on November 1, 2006.
Ranking		The notes will:

		• be unsecured;
		• rank equally with all of our other unsecured and unsubordinated indebtedness; and
		• effectively rank below all existing and future indebtedness and other liabilities of our subsidiaries.

		As of March 31, 2006, our subsidiaries had no outstanding third-party debt.
Optional Redemption		We may redeem all or a part of the notes at any time and from time to time as specified under the heading “Description of the Notes — Optional Redemption” beginning on page S-11.
Significant Covenants		We will issue the notes under an indenture containing certain restrictive covenants for your benefit. Certain of these covenants, which are described under “Description of the Notes — Restrictive Covenants” beginning on page S-12 and are subject to termination as described, initially restrict our ability, with some exceptions, to:

		• incur certain debt secured by liens; and
		• engage in sale/leaseback transactions.

		In addition, the indenture restricts our ability to merge, consolidate or transfer substantially all of our assets. See “Description of Our Senior Debt Securities — Consolidation, Merger and Sale of Assets” on page 8 of the accompanying prospectus.
Lack of Public Markets for the Notes		There is no existing market for the notes. We cannot provide any assurance about:

		• the liquidity of any markets that may develop for the notes;
		• your ability to sell the notes; or
		• the prices at which you will be able to sell the notes.

		Future trading prices of the notes will depend on many factors, including:

		• prevailing interest rates;
		• our operating results;
		• the ratings of the notes; and
		• the market for similar securities.

		We do not intend to apply for listing of the notes on any securities exchange or for quotation of the notes in any automated dealer quotation system.
Risk Factors		You should consider carefully all the information set forth in this prospectus supplement and the accompanying prospectus and, in particular, you should evaluate the specific factors set forth under “Risk Factors” beginning on page S-4 before deciding whether to invest in the notes.
Governing Law		The indenture and the notes are governed by, and construed in accordance with, the laws of the State of New York.
Use of Proceeds		The net proceeds from this offering will be approximately $           million, after deducting underwriters’ discounts and estimated expenses of the offering. We intend to use the net proceeds from this offering for general corporate purposes, including repayment or refinancing of debt, including $145 million of our 8.90% debentures due December 15, 2006, capital expenditures, working capital and loans or advances to affiliates. Pending application of the net proceeds from this offering for these purposes, we intend to invest in CenterPoint Energy’s money pool or, directly or indirectly, in short-term marketable securities. See “Use of Proceeds” on page S-9.
Further Issues		The notes are initially limited to $325 million in aggregate principal amount. However, we may issue additional notes of the same series from time to time without the consent of the holders.
Trustee and Paying Agent		JPMorgan Chase Bank, National Association.

RISK FACTORS

      You should consider carefully the following information about risks, as well as risks arising from any legal proceedings identified in Part I, Item 3. “Legal Proceedings” of our Annual Report on Form 10-K for the year ended December 31, 2005 (“2005 Form 10-K”), together with the other information contained in this prospectus supplement and the accompanying prospectus, before making an investment in the notes.

Risk Factors Affecting Our Businesses

      Our rates for our local distribution companies are regulated by certain municipalities and state commissions, and for our interstate pipelines by the FERC, based on an analysis of our invested capital and our expenses in a test year. Thus, the rates that we are allowed to charge may not match our expenses at any given time. The regulatory process in which rates are determined may not always result in rates that will produce full recovery of our costs and enable us to earn a reasonable return on our invested capital.

      We compete primarily with alternate energy sources such as electricity and other fuel sources. In some areas, intrastate pipelines, other natural gas distributors and marketers also compete directly with us for natural gas sales to end-users. In addition, as a result of federal regulatory changes affecting interstate pipelines, natural gas marketers operating on these pipelines may be able to bypass our facilities and market, sell and/or transport natural gas directly to commercial and industrial customers. Any reduction in the amount of natural gas marketed, sold or transported by us as a result of competition may have an adverse impact on our results of operations, financial condition and cash flows.

      Our two interstate pipelines and our gathering systems compete with other interstate and intrastate pipelines and gathering systems in the transportation and storage of natural gas. The principal elements of competition are rates, terms of service, and flexibility and reliability of service. They also compete indirectly with other forms of energy, including electricity, coal and fuel oils. The primary competitive factor is price. The actions of our competitors could lead to lower prices, which may have an adverse impact on our results of operations, financial condition and cash flows.

      We are subject to risk associated with increases in the price of natural gas, which has been the trend in recent years. Increases in natural gas prices might affect our ability to collect balances due from our customers and, on the regulated side, could create the potential for uncollectible accounts expense to exceed the recoverable levels built into our tariff rates. In addition, a sustained period of high natural gas prices could apply downward demand pressure on natural gas consumption in the areas in which we operate and increase the risk that our suppliers or customers fail or are unable to meet their obligations. Additionally, increasing gas prices could create the need for us to provide collateral in order to purchase gas.

      Our contract with Laclede Gas Company, one of our pipeline’s customers, is currently scheduled to expire in 2007. To the extent the pipeline is unable to extend this contract or the contract is renegotiated

at rates substantially less than the rates provided in the current contract, there could be an adverse effect on our results of operations, financial condition and cash flows.

      If our credit rating were to decline, we might be required to post cash collateral in order to purchase natural gas. If a credit rating downgrade and the resultant cash collateral requirement were to occur at a time when we were experiencing significant working capital requirements or otherwise lacked liquidity, we might be unable to obtain the necessary natural gas to meet our obligations to customers, and our results of operations, financial condition and cash flows would be adversely affected.

      Our pipelines and field services business largely relies on gas sourced in the various supply basins located in the Midcontinent region of the United States. To the extent the availability of this supply is substantially reduced, it could have an adverse effect on our results of operations, financial condition and cash flows.

      A substantial portion of our revenues is derived from natural gas sales and transportation. Thus, our revenues and results of operations are subject to seasonality, weather conditions and other changes in natural gas usage, with revenues being higher during the winter months.

Risk Factors Associated with Our Consolidated Financial Condition

      As of March 31, 2006, we had $2 billion of outstanding indebtedness on a consolidated basis, with approximately $458 million principal amount of this debt required to be paid through 2008. Our future financing activities may depend, at least in part, on:

      Our current credit ratings are discussed in “Management’s Narrative Analysis of Results of Operations — Liquidity — Impact on Liquidity of a Downgrade in Credit Ratings” in Item 7 of our 2005 Form 10-K. These credit ratings may not remain in effect for any given period of time and one or more of these ratings may be lowered or withdrawn entirely by a rating agency. We note that these credit ratings are not recommendations to buy, sell or hold our securities. Each rating should be evaluated independently of any other rating. Any future reduction or withdrawal of one or more of our credit ratings could have a material adverse impact on our ability to access capital on acceptable terms.

      Our ratings and credit may be impacted by CenterPoint Energy’s credit standing. As of March 31, 2006, CenterPoint Energy and its other subsidiaries had approximately $200 million principal amount of debt required to be paid through 2008. This amount excludes amounts related to capital leases, transition bonds and indexed debt securities obligations. In addition, as of March 31, 2006, CenterPoint Energy has $830 million of outstanding convertible notes on which holders could exercise their “put” rights during this period. We cannot assure you that CenterPoint Energy and its other subsidiaries will be able to pay or refinance these amounts. If CenterPoint Energy were to experience a deterioration in its credit standing or liquidity difficulties, our access to credit and our credit ratings could be adversely affected.

      We are managed by officers and employees of CenterPoint Energy. Our management will make determinations with respect to the following:

      There are no contractual restrictions on our ability to pay dividends to CenterPoint Energy. Our management could decide to increase our dividends to CenterPoint Energy to support its cash needs. This could adversely affect our liquidity. However, under our credit facility and our receivables facility, our ability to pay dividends is restricted by a covenant that debt as a percentage of total capitalization may not exceed 65%.

      We use derivative instruments, such as swaps, options, futures and forwards, to manage our commodity and financial market risks. We could recognize financial losses as a result of volatility in the market values of these contracts, or should a counterparty fail to perform. In the absence of actively quoted market prices and pricing information from external sources, the valuation of these financial instruments can involve management’s judgment or use of estimates. As a result, changes in the underlying assumptions could affect the reported fair value of these contracts.

Risks Common to Our Businesses and Other Risks

      Our operations are subject to stringent and complex laws and regulations pertaining to health, safety and the environment. As an owner or operator of natural gas pipelines and distribution systems, gas gathering and processing systems, and electric transmission and distribution systems we must comply with these laws and regulations at the federal, state and local levels. These laws and regulations can restrict or impact our business activities in many ways, such as:

      In order to comply with these requirements, we may need to spend substantial amounts and devote other resources from time to time to:

      Failure to comply with these laws and regulations may trigger a variety of administrative, civil and criminal enforcement measures, including the assessment of monetary penalties, the imposition of remedial actions, and the issuance of orders enjoining future operations. Certain environmental statutes impose strict, joint and several liability for costs required to clean up and restore sites where hazardous substances have been disposed or otherwise released. Moreover, it is not uncommon for neighboring landowners and other third parties to file claims for personal injury and property damage allegedly caused by the release of hazardous substances or other waste products into the environment.

      We currently have general liability and property insurance in place to cover certain of our facilities in amounts that we consider appropriate. Such policies are subject to certain limits and deductibles and do not include business interruption coverage. Insurance coverage may not be available in the future at current costs or on commercially reasonable terms, and the insurance proceeds received for any loss of, or any damage to, any of our facilities may not be sufficient to restore the loss or damage without negative impact on our results of operations, financial condition and cash flows.

      In connection with the organization and capitalization of our former affiliate, Reliant Energy, Inc. (RRI), by the predecessor of CenterPoint Energy, RRI and its subsidiaries assumed liabilities associated with various assets and businesses Reliant Energy, Incorporated transferred to them. RRI also agreed to indemnify, and cause the applicable transferee subsidiaries to indemnify, CenterPoint Energy and its subsidiaries, including us, with respect to liabilities associated with the transferred assets and businesses. The indemnity provisions were intended to place sole financial responsibility on RRI and its subsidiaries for all liabilities associated with the current and historical businesses and operations of RRI, regardless of the time those liabilities arose. If RRI is unable to satisfy a liability that has been so assumed in circumstances in which Reliant Energy, Incorporated and its subsidiaries were not released from the liability in connection with the transfer, we or CenterPoint Energy could be responsible for satisfying the liability.

      Prior to CenterPoint Energy’s distribution of its ownership in RRI to its shareholders, we had guaranteed certain contractual obligations of what became RRI’s trading subsidiary. Under the terms of the separation agreement between the companies, RRI agreed to extinguish all such guaranty obligations prior to separation, but when separation occurred in September 2002, RRI had been unable to extinguish all obligations. To secure CenterPoint Energy and us against obligations under the remaining guarantees, RRI agreed to provide cash or letters of credit for our benefit and that of CenterPoint Energy, and undertook to use commercially reasonable efforts to extinguish the remaining guarantees. Our current

exposure under the remaining guarantees relates to our guaranty of the payment by RRI of demand charges related to transportation contracts with one counterparty. The demand charges are approximately $53 million per year in 2006 through 2015, $49 million in 2016, $38 million in 2017 and $13 million in 2018. As a result of changes in market conditions, our potential exposure under that guaranty currently exceeds the security provided by RRI. We have requested RRI to increase the amount of its existing letters of credit or, in the alternative, to obtain a release of our obligations under the guaranty, and we and RRI are pursuing other alternatives. RRI continues to meet its obligations under the transportation contracts.

      RRI’s unsecured debt ratings are currently below investment grade. If RRI were unable to meet its obligations, it would need to consider, among various options, restructuring under the bankruptcy laws, in which event RRI might not honor its indemnification obligations and claims by RRI’s creditors might be made against us as its former owner.

Risk Factor Related to the Notes

      The notes will be a new issue of securities for which there is currently no established trading market. We do not intend to apply for the listing of the notes on any securities exchange or for quotation of the notes on any dealer quotation system. Even if a market for the notes does develop, we cannot assure you that there will be liquidity in that market, or that the notes might not trade for less than the their original value or face amount. The liquidity of any market for the notes will depend on the number of holders of those notes, the interest of securities dealers in making a market in those securities and other factors. If a liquid market for the notes does not develop, you may be unable to resell the notes for a long period of time, if at all. Accordingly, we cannot assure you as to the development or liquidity of any trading market for the notes or as to your ability to sell your notes.

      Even if a market for the notes develops, trading prices could be higher or lower than the initial offering price. The prices of the notes will depend on many factors, including prevailing interest rates, our operating results and financial conditions and the market for similar securities. Declines in the market prices for debt securities generally may also materially and adversely affect the liquidity of the notes, independent of our financial performance.

USE OF PROCEEDS

      The net proceeds from this offering will be approximately $          million, after deducting underwriters’ discounts and the estimated expenses of the offering. We intend to use the net proceeds from this offering for general corporate purposes, including repayment or refinancing of debt, including $145 million of our 8.90% debentures due December 15, 2006, capital expenditures, working capital and loans or advances to affiliates. Pending application of the net proceeds from this offering for these purposes, we intend to invest in CenterPoint Energy’s money pool or, directly or indirectly, in short-term marketable securities.

CAPITALIZATION

      The following table sets forth our short-term debt and capitalization as of March 31, 2006. No adjustments have been made for the issuance of the notes in this offering or the use of the proceeds therefrom, as discussed in “Use of Proceeds” above. This table should be read in conjunction with our consolidated financial statements and related notes thereto and “Management’s Narrative Analysis of the Results of Operations” included in our 2005 Form 10-K and our Quarterly Report on Form 10-Q for the period ended March 31, 2006.

DESCRIPTION OF THE NOTES

      The following description of the particular terms of the notes (referred to in the accompanying prospectus as the debt securities) supplements, and to the extent inconsistent therewith replaces, the description of the general terms and provisions of the debt securities set forth in the accompanying prospectus, to which we refer you.

      We will issue the notes (the “notes”) under an indenture, dated as of February 1, 1998, as supplemented (the “indenture”), between us and JPMorgan Chase Bank, National Association (formerly Chase Bank of Texas, National Association), as trustee. The following description is a summary of the material provisions of the notes and the indenture. This summary is not complete and is qualified in its entirety by reference to the indenture and the notes. For a complete description of the notes, you should refer to the indenture and the supplemental indenture establishing the terms of the notes, copies of which are available from us. In addition, we have filed the indenture and will file the supplemental indenture with the SEC. Please read “Where You Can Find More Information.”

      We may issue debt securities from time to time in one or more series under the indenture. There is no limitation on the amount of debt securities we may issue under the indenture. As of March 31, 2006, approximately $1.8 billion aggregate principal amount of debt securities were outstanding under the indenture.

      We have included cross-references in the summary below to refer you to the section numbers of the indenture we are describing.

Ranking of the Notes

      The notes will:

      Subject to the exceptions, and subject to compliance with the applicable requirements, set forth in the indenture, we may discharge our obligations under the indenture with respect to the notes as described in the accompanying prospectus under the heading “Description of Our Senior Debt Securities — Defeasance.”

Principal, Maturity and Interest

      The notes will mature on May 1, 2016. The notes are initially limited to $325 million in aggregate principal amount. However, we may issue additional notes of the same series from time to time, without the consent of the holders of the notes.

      Interest on the notes will:

If any interest payment date, the maturity date or any redemption date falls on a day that is not a business day, the payment will be made on the next business day with the same force and effect as if made on the relevant interest payment date, maturity date or redemption date. Unless we default on a payment, no interest will accrue for the period from and after the applicable maturity date or redemption date.

Optional Redemption

      We may redeem the notes, in whole or in part, at our option exercisable at any time and from time to time upon not less than 30 and not more than 60 days’ notice as provided in the indenture, on any date prior to their maturity at a redemption price equal to:

      The redemption price will never be less than 100% of the principal amount of the notes redeemed plus accrued and unpaid interest thereon, if any, to, but excluding, the redemption date.

      The amount of the make-whole premium with respect to any note to be redeemed will be equal to the excess, if any, of:

      (1) the sum of the present values, calculated as of the redemption date, of:

      (2) the principal amount of the note being redeemed.

      The present values of interest and principal payments referred to in clause (1) above will be determined in accordance with generally accepted principles of financial analysis. These present values will be calculated by discounting the amount of each payment of interest or principal from the date that each such payment would have been payable, but for the redemption, to the redemption date at a discount rate equal to the comparable treasury yield (as defined below) plus           basis points.

      The make-whole premium will be calculated by an independent investment banking institution of national standing appointed by us. If we fail to appoint an independent investment banking institution at least 45 days prior to the redemption date, or if the independent investment banking institution we appoint is unwilling or unable to calculate the make-whole premium, the calculation will be made by Barclays Capital Inc., LaSalle Financial Services, Inc. or Scotia Capital (USA) Inc. If Barclays Capital Inc., LaSalle Financial Services, Inc. and Scotia Capital (USA) Inc. are unwilling or unable to make the calculation, we will appoint a different independent investment banking institution of national standing to make the calculation.

      For purposes of determining the make-whole premium, “comparable treasury yield” means a rate of interest per annum equal to the weekly average yield to maturity of United States Treasury Securities that have a constant maturity that corresponds to the remaining term to maturity of the notes to be redeemed, calculated to the nearest 1/12th of a year. The comparable treasury yield will be determined as of the third business day immediately preceding the applicable redemption date.

      The weekly average yields of United States Treasury Securities will be determined by reference to the most recent statistical release published by the Federal Reserve Bank of New York and designated “H.15(519) Selected Interest Rates” or any successor release. If this statistical release sets forth a weekly average yield for United States Treasury Securities having a constant maturity that is the same as the

remaining term calculated as set forth above, then the comparable treasury yield will be equal to such weekly average yield. In all other cases, the comparable treasury yield will be calculated by interpolation on a straight-line basis, between the weekly average yields on the United States Treasury Securities that have a constant maturity closest to and greater than the remaining term and the United States Treasury Securities that have a constant maturity closest to and less than the remaining term (in each case as set forth in the H.15 statistical release or any successor release). Any weekly average yields calculated by interpolation will be rounded to the nearest 1/100th of 1%, with any figure of 1/200th of 1% or above being rounded upward. If weekly average yields for United States Treasury Securities are not available in the H.15 statistical release or otherwise, then the comparable treasury yield will be calculated by interpolation of comparable rates selected by an independent investment banking institution selected in the manner described in the second preceding paragraph.

      If we redeem the notes in part, the trustee will select the notes for redemption on a pro rata basis, by lot or by such other method as the trustee in its sole discretion deems fair and appropriate. We will only redeem notes in multiples of $1,000 in original principal amount. If any note is to be redeemed in part only, the notice of redemption will state the portion of the principal amount to be redeemed. A new note in principal amount equal to the unredeemed portion of the original note will be issued upon the cancellation of the original note.

Sinking Fund

      We are not obligated to make mandatory redemption or sinking fund payments with respect to the notes.

Restrictive Covenants

      The indenture does not limit the amount of indebtedness or other obligations that we may incur and does not contain provisions that would give holders of the notes the right to require us to repurchase their notes in the event of a change in control of us, or in the event we enter into one or more highly leveraged transactions, regardless of whether a rating decline results therefrom, or in the event we dispose of one or more of our business units, nor are any such events deemed to be events of default under the terms of the indenture.

      The indenture contains certain covenants for the benefit of the holders of the notes which we have summarized below and in the accompanying prospectus under the heading “Description of Our Senior Debt Securities — Consolidation, Merger and Sale of Assets.” The restrictive covenants summarized below are applicable to the notes; provided, however, that these restrictive covenants will terminate pursuant to the termination provision of the indenture and will no longer be applicable to the notes on and after the date, which we refer to as the “termination date,” on which there remains outstanding, in the aggregate, no more than $200 million in principal amount of our:

Our 7.875% Senior Notes due 2013 and our 5.95% Senior Notes due 2014 have covenants similar to the restrictive covenants summarized below.

      Limitations on Liens. We will not, and we will not permit any subsidiary (as defined below) to, pledge, mortgage or hypothecate, or permit to exist, except in our favor or in favor of any subsidiary, any lien (as defined below) upon any principal property (as defined below) or any equity interest (as defined below) in any significant subsidiary (as defined below) owning any principal property, at any time owned

by us or by a subsidiary, to secure any indebtedness (as defined below), unless effective provision is made whereby outstanding notes will be secured equally and ratably therewith (or prior thereto), and with any other indebtedness similarly entitled to be equally and ratably secured. This restriction will not apply to or prevent the creation or existence of:

      Notwithstanding the foregoing, we or a subsidiary may issue, assume or guarantee indebtedness secured by a mortgage which would otherwise be subject to the foregoing restrictions in an aggregate amount which, together with all of our other indebtedness or indebtedness of a subsidiary secured by a mortgage (not including secured indebtedness permitted under the foregoing exceptions) and the value of all sale and leaseback transactions (as defined below) existing at such time (other than sale and leaseback transactions which, if a lien, would have been permitted under the third or fourth bullet points above), does not at the time such indebtedness is incurred exceed 5% of consolidated net tangible assets (as defined below), as shown on our most recent audited consolidated balance sheet preceding the date of determination. For purposes of this “Limitation on Liens” covenant, subsidiary does not include a project finance subsidiary (as defined below).

      Limitation on Sale and Leaseback Transactions. We will not, and we will not permit any subsidiary to, engage in a sale and leaseback transaction of any principal property unless the net proceeds of such sale are at least equal to the fair value of such principal property (as determined by our board of directors) and either:

      For purposes of this “Limitation on Sale and Leaseback Transactions” covenant, subsidiary does not include a project finance subsidiary.

Defined Terms

      “Capital lease” means a lease that, in accordance with accounting principles generally accepted in the United States, would be recorded as a capital lease on the balance sheet of the lessee.

      “Consolidated net tangible assets” means the total amount of our assets, including the assets of our subsidiaries, less, without duplication:

      “Equity interests” means any capital stock, partnership, joint venture, member or limited liability or unlimited liability company interest, beneficial interest in a trust or similar entity or other equity interest or investment of whatever nature.

      “Indebtedness,” as applied to us or any subsidiary, means bonds, debentures, notes and other instruments or arrangements representing obligations created or assumed by us or any such subsidiary, including any and all:

      All indebtedness secured by a lien upon property owned by us or any subsidiary and upon which indebtedness we or any such subsidiary customarily pays interest, although we or any such subsidiary has not assumed or become liable for the payment of such indebtedness, is also deemed to be indebtedness of us or any such subsidiary. All indebtedness for borrowed money incurred by other persons which is directly guaranteed as to payment of principal by us or any subsidiary will for all purposes of the indenture be deemed to be indebtedness of us or any such subsidiary, but no other contingent obligation of us or any such subsidiary in respect of indebtedness incurred by other persons shall be deemed indebtedness of us or any such subsidiary.

      “Lien” means any mortgage, deed of trust, pledge, hypothecation, assignment, deposit arrangement, charge, security interest, encumbrance or lien of any kind whatsoever (including any capital lease).

      “Non-recourse debt” means (i) any indebtedness for borrowed money incurred by any project finance subsidiary to finance the acquisition, improvement, installation, design, engineering, construction, development, completion, maintenance or operation of, or otherwise to pay costs and expenses relating to or providing financing for, any project, which indebtedness for borrowed money does not provide for recourse against us or any of our subsidiaries (other than a project finance subsidiary and such recourse as exists under a performance guaranty) or any property or asset of us or any of our subsidiaries (other than equity interests in, or the property or assets of, a project finance subsidiary and such recourse as exists under a performance guaranty) and (ii) any refinancing of such indebtedness for borrowed money that does not increase the outstanding principal amount thereof (other than to pay costs incurred in connection therewith and the capitalization of any interest or fees) at the time of the refinancing or increase the property subject to any lien securing such indebtedness for borrowed money or otherwise add additional security or support for such indebtedness for borrowed money.

      “Performance guaranty” means any guaranty issued in connection with any non-recourse debt that (i) if secured, is secured only by assets of or equity interests in a project finance subsidiary, and (ii) guarantees to the provider of such non-recourse debt or any other person (a) performance of the improvement, installation, design, engineering, construction, acquisition, development, completion, maintenance or operation of, or otherwise affects any such act in respect of, all or any portion of the project that is financed by such non-recourse debt, (b) completion of the minimum agreed equity or other contributions or support to the relevant project finance subsidiary, or (c) performance by a project finance subsidiary of obligations to persons other than the provider of such non-recourse debt.

      “Principal property” means any natural gas distribution property, natural gas pipeline or gas processing plant located in the United States, except any such property that in the opinion of our board of directors is not of material importance to the total business conducted by us and our consolidated subsidiaries. “Principal property” shall not include any oil or gas property or the production or proceeds of production from an oil or gas producing property or the production or any proceeds of production of gas processing plants or oil or gas or petroleum products in any pipeline or storage field.

      “Project finance subsidiary” and “project finance subsidiaries” means any of our subsidiaries designated by us whose principal purpose is to incur non-recourse debt and/or construct, lease, own or operate the assets financed thereby, or to become a direct or indirect partner, member or other equity

participant or owner in a person created for such purpose, and substantially all the assets of which subsidiary or person are limited to (x) those assets being financed (or to be financed), or the operation of which is being financed (or to be financed), in whole or in part by non-recourse debt, or (y) equity interests in, or indebtedness or other obligations of, one or more other such subsidiaries or persons, or (z) indebtedness or other obligations of us or our subsidiaries or other persons. At the time of designation of any project finance subsidiary, the sum of the net book value of the assets of such subsidiary and the net book value of the assets of all other project finance subsidiaries then existing shall not in the aggregate exceed 10 percent of the consolidated net tangible assets.

      “Sale and leaseback transaction” means any arrangement entered into by us or any subsidiary with any person providing for the leasing to us or any subsidiary of any principal property (except for temporary leases for a term, including any renewal thereof, of not more than three years and except for leases between us and a subsidiary or between subsidiaries), which principal property has been or is to be sold or transferred by us or such subsidiary to such person.

      “Significant subsidiary” means any subsidiary of ours, other than a project finance subsidiary, that is a “significant subsidiary” as defined in Rule 1-02 of Regulation S-X under the Securities Act of 1933 and the Securities Exchange Act of 1934, as such regulation is in effect on the date of issuance of the notes.

      “Subsidiary” of any entity means any corporation, partnership, joint venture, limited liability company, trust or estate of which (or in which) more than 50% of (i) the issued and outstanding capital stock having ordinary voting power to elect a majority of the board of directors of such corporation (irrespective of whether at the time capital stock of any other class or classes of such corporation shall or might have voting power upon the occurrence of any contingency), (ii) the interest in the capital or profits of such limited liability company, partnership, joint venture or other entity or (iii) the beneficial interest in such trust or estate is at the time directly or indirectly owned or controlled by such entity, by such entity and one or more of its other subsidiaries or by one or more of such entity’s other subsidiaries.

Payment and Paying Agent

      We have designated the trustee as the sole paying agent for the notes.

Events of Default

      Each of the following is an event of default under the indenture with respect to the notes; provided, however, that the event of default described in the fourth bullet point below will terminate pursuant to the termination provision of the indenture and will no longer be applicable to the notes on and after the termination date:

provided, however, that no event described in the third, fourth or fifth bullet points above will be an event of default until an officer of the trustee, assigned to and working in the trustee’s corporate trust department, has actual knowledge of the event or until the trustee receives written notice of the event at its corporate trust office, and the notice refers to the notes generally, us or the indenture. (Section 501)

      If an event of default occurs and is continuing with respect to the notes, either the trustee or the holders of at least 25% in principal amount of the outstanding notes may declare the principal amount of the notes due and immediately payable. In order to declare the principal amount of the notes due and immediately payable, the trustee or the holders must deliver a notice that satisfies the requirements of the indenture. Upon a declaration by the trustee or the holders, we will be obligated to pay the principal amount of the notes.

      This right does not apply if an event of default described in the fifth bullet point above occurs. If one of the events of default described in the fifth bullet point above occurs and is continuing, the notes then outstanding under the indenture shall be due and payable immediately.

      After any declaration of acceleration of the notes, but before a judgment or decree for payment, the holders of a majority in principal amount of the outstanding notes may, under certain circumstances, rescind and annul the declaration of acceleration if all events of default, other than the non-payment of principal, have been cured or waived as provided in the indenture. (Section 502) For information regarding waiver of defaults, please read “Description of Our Senior Debt Securities — Modification and Waiver” in the accompanying prospectus.

      If an event of default occurs and is continuing, the trustee will generally have no obligation to exercise any of its rights or powers under the indenture at the request or direction of any of the holders, unless the holders offer reasonable indemnity to the trustee. (Section 603) The holders of a majority in principal amount of the outstanding notes will generally have the right to direct the time, method and place of conducting any proceeding for any remedy available to the trustee or exercising any trust or power conferred on the trustee for the notes, provided that:

      A holder of a note may only pursue a remedy under the indenture if:

However, these limitations do not apply to a suit by a holder of a note demanding payment of the principal, premium, if any, or interest on a note on or after the date the payment is due. (Section 508)

      We will be required to furnish to the trustee annually a statement by some of our officers regarding our performance or observance of any of the terms of the indenture and specifying all of our known defaults, if any. (Section 1004)

Exchange and Transfer of the Notes

      We will issue the notes in registered form, without coupons. We will only issue notes in denominations of integral multiples of $1,000.

      Holders may present notes for exchange or for registration of transfer at the office of the security registrar or at the office of any transfer agent we designate for that purpose. The security registrar or designated transfer agent will exchange or transfer the notes if it is satisfied with the documents of title and identity of the person making the request. We will not charge a service charge for any exchange or registration of transfer of notes. However, we may require payment of a sum sufficient to cover any tax or other governmental charge payable for the exchange or registration of transfer. The trustee will serve as the security registrar. (Section 305) At any time we may:

      However, we are required to maintain a transfer agent in each place of payment for the notes at all times. (Sections 305 and 1002)

      In the event we elect to redeem the notes, neither we nor the trustee will be required to register the transfer or exchange of the notes:

Regarding the Trustee

      JPMorgan Chase Bank, National Association is the trustee, security registrar and paying agent under the indenture for the notes. As of March 31, 2006, the trustee serves as trustee for approximately $1.8 billion aggregate principal amount of our debt securities. In addition, the trustee serves as trustee or fiscal agent for debt securities of our affiliates aggregating approximately $6.0 billion as of March 31, 2006.

      The trustee and its affiliates are parties to credit agreements under which we and our affiliates have bank lines of credit. We and our affiliates maintain depository and other banking, investment banking and investment management relationships with the trustee and its affiliates.

Book-Entry Delivery and Settlement

      We will issue the notes in the form of one or more permanent global notes in definitive, fully registered, book-entry form. The global notes will be deposited with or on behalf of The Depository Trust Company and registered in the name of Cede & Co., as nominee of DTC, or will remain in the custody of the trustee in accordance with the FAST Balance Certificate Agreement between DTC and the trustee.

      Beneficial interests in the global notes will be represented through book-entry accounts of financial institutions acting on behalf of beneficial owners as direct and indirect participants in DTC. Investors may hold interests in the global notes through DTC either directly if they are participants in DTC or indirectly through organizations that are participants in DTC. DTC has advised us as follows:

      We have provided the description of the operations and procedures of DTC in this prospectus supplement solely as a matter of convenience. These operations and procedures are solely within the control of DTC and are subject to change by it from time to time. Neither we nor the underwriters or the trustee takes any responsibility for these operations or procedures, and you are urged to contact DTC or its participants directly to discuss these matters.

      We expect that under procedures established by DTC:

      The laws of some jurisdictions may require that purchasers of securities take physical delivery of those securities in definitive form. Accordingly, the ability to transfer interests in the notes represented by a global note to those persons may be limited. In addition, because DTC can act only on behalf of its participants, who in turn act on behalf of persons who hold interests through participants, the ability of a person having an interest in notes represented by a global note to pledge or transfer those interests to persons or entities that do not participate in DTC’s system, or otherwise to take actions in respect of such interest, may be affected by the lack of a physical definitive security in respect of such interest.

      So long as DTC or its nominee is the registered owner of a global note, DTC or that nominee will be considered the sole owner or holder of the notes represented by that global note for all purposes under the indenture and under the notes. Except as provided below, owners of beneficial interests in a global note will not be entitled to have notes represented by that global note registered in their names, will not receive or be entitled to receive physical delivery of certificated notes and will not be considered the owners or holders thereof under the indenture or under the notes for any purpose, including with respect to the giving of any direction, instruction or approval to the trustee. Accordingly, each holder owning a beneficial interest in a global note must rely on the procedures of DTC and, if that holder is not a direct or indirect participant, on the procedures of the participant through which that holder owns its interest, to exercise any rights of a holder of notes under the indenture or the global note.

      Neither we nor the trustee will have any responsibility or liability for any aspect of the records relating to or payments made on account of notes by DTC, or for maintaining, supervising or reviewing any records of DTC relating to the notes.

      Payments on the notes represented by the global notes will be made to DTC or its nominee, as the case may be, as the registered owner thereof. We expect that DTC or its nominee, upon receipt of any payment on the notes represented by a global note, will credit participants’ accounts with payments in amounts proportionate to their respective beneficial interests in the global note as shown in the records of DTC or its nominee. We also expect that payments by participants to owners of beneficial interests in the global note held through such participants will be governed by standing instructions and customary practice as is now the case with securities held for the accounts of customers registered in the names of nominees for such customers. The participants will be responsible for those payments.

      Initial settlement for the notes will be made in immediately available funds. Secondary market trading between DTC participants will occur in the ordinary way in accordance with DTC rules and will be settled in immediately available funds. Although DTC has agreed to the foregoing procedures to facilitate transfers of the notes among its participants, it is under no obligation to perform or continue to perform such procedures and such procedures may be changed or discontinued at any time.

Certificated Notes

      Certificated notes will be issued to each person that DTC identifies as the beneficial owner of the notes represented by the global notes, upon surrender by DTC of the global notes, if (i) DTC or any successor depositary (the “depositary”) notifies us that it is no longer willing or able to act as a depositary for the global notes or DTC ceases to be registered as a clearing agency under the Securities Exchange Act of 1934 and a successor depositary is not appointed within 90 days of such notice or cessation, (ii) we, at our option, notify the trustee in writing that we elect to cause the issuance of notes in definitive form under the indenture or (iii) upon the occurrence of certain other events as provided pursuant to the indenture.

UNDERWRITING

      Subject to the terms and conditions set forth in an underwriting agreement between us and the underwriters named below, for whom Barclays Capital Inc., LaSalle Financial Services, Inc. and Scotia Capital (USA) Inc. are acting as representatives, we have agreed to sell to each of the underwriters, and each of the underwriters has severally agreed to purchase from us, the principal amount of notes set forth opposite its name below.

      The obligations of the underwriters, including their agreement to purchase the notes from us, are several and not joint. The underwriting agreement provides that the obligations of the underwriters are subject to certain conditions and that the underwriters will be obligated to purchase all of the notes if any are purchased. The underwriting agreement also provides that if an underwriter defaults, the purchase commitments of the non-defaulting underwriters may be increased or the offering of notes may be terminated.

      The underwriters have advised us that they propose to initially offer the notes to the public at the offering price appearing on the cover page of this prospectus supplement and may also offer the notes to dealers at a price that represents a concession not in excess of      % of the principal amount of the notes. Any underwriter may allow, and any of these dealers may re-allow, a concession not in excess of      % of the principal amount of the notes. After the initial offering of the notes, the underwriters may from time to time vary the offering price and other selling terms.

      The notes are a new issue of securities with no established trading market. We do not intend to apply for listing of the notes on any national securities exchange or the Nasdaq Stock Market. The underwriters have advised us that they intend to make a market in the notes after the offering, although they are under no obligation to do so. The underwriters may discontinue any market-making activities at any time without any notice. We can give no assurance as to the liquidity of the trading market for the notes or that a public trading market for the notes will develop.

      In connection with the offering of the notes, the underwriters may engage in transactions that stabilize, maintain or otherwise affect the price of the notes. Specifically, the underwriters may overallot in connection with the offering of the notes, creating a syndicate short position. In addition, the underwriters may bid for, and purchase, the notes in the open market to cover short positions or to stabilize the price of the notes. Finally, the underwriters may reclaim selling concessions allowed for distributing the notes in the offering, if the underwriters repurchase previously distributed notes in transactions to cover short positions, in stabilization transactions or otherwise. Any of these activities may stabilize or maintain the market prices of the notes above independent market levels. The underwriters are not required to engage in any of these activities, and may end any of them at any time without notice.

      We estimate that our share of the total expenses of the offering, excluding underwriting discounts and commissions, will be approximately $600,000.

      We have agreed to indemnify the underwriters against, or contribute to payments that the underwriters may be required to make in respect of, certain liabilities, including liabilities under the Securities Act of 1933, as amended.

      In the ordinary course of their respective businesses, the underwriters and/or their affiliates have engaged, and may in the future engage, in commercial banking, investment banking or investment management transactions with us and our affiliates for which they have received, and will in the future receive, customary compensation.

      Lazard Capital Markets LLC has entered into an agreement with Mitsubishi UFJ Securities (USA), Inc. (MUS (USA)) pursuant to which MUS (USA) provides certain advisory and/or other services to Lazard Capital Markets LLC, including in respect of this offering. In return for the provision of such services by MUS (USA) to Lazard Capital Markets LLC, Lazard Capital Markets LLC will pay to MUS (USA) a mutually agreed upon fee.

      Certain of the underwriters will make the notes available for distribution on the Internet through a proprietary Web site and/or a third-party system operated by MarketAxess Corporation, an Internet-based communications technology provider. MarketAxess Corporation is providing the system as a conduit for communications between those underwriters and their customers and is not a party to any transactions. MarketAxess Corporation, a registered broker-dealer, will receive compensation from such underwriters based on transactions they conduct through the system. Certain of the underwriters will make the notes available to their customers through the Internet distributions, whether made through a proprietary or third-party system, on the same terms as distributions made through other channels.

LEGAL MATTERS

      Baker Botts L.L.P., Houston, Texas will pass on the validity of the notes offered in this prospectus supplement. Scott E. Rozzell, Esq., our Executive Vice President, General Counsel and Corporate Secretary, or Rufus S. Scott, Esq., our Vice President, Deputy General Counsel and Assistant Corporate Secretary, may pass on other legal matters for us. Dewey Ballantine LLP will pass on certain legal matters for the underwriters.

EXPERTS

      The consolidated financial statements and related consolidated financial statement schedule incorporated in this document by reference from our 2005 Form 10-K have been audited by Deloitte & Touche LLP, an independent registered public accounting firm, as stated in their reports (which reports express an unqualified opinion and include an explanatory paragraph regarding our adoption of a new accounting standard related to conditional asset retirement obligations), which are incorporated herein by reference, and have been so incorporated in reliance upon the reports of such firm given upon their authority as experts in accounting and auditing.

WHERE YOU CAN FIND MORE INFORMATION

      We file annual, quarterly and current reports and other information with the SEC. You may read and copy any document we file with the SEC at the SEC’s public reference room located at 100 F Street, N.E., Washington, D.C. 20549. You may obtain further information regarding the operation of the SEC’s public reference room by calling the SEC at 1-800-SEC-0330. Our filings are also available to the public on the SEC’s Internet site located at http://www.sec.gov. You can obtain information about us at the offices of the New York Stock Exchange, 20 Broad Street, New York, New York 10005.

      This prospectus supplement is part of a registration statement we have filed with the SEC relating to the securities we may offer. As permitted by SEC rules, this prospectus supplement does not contain all of the information we have included in the registration statement and the accompanying exhibits and schedules we file with the SEC. You may refer to the registration statement, the exhibits and the schedules for more information about us and our securities. The registration statement, exhibits and schedules are available at the SEC’s public reference room or through its Internet site.

      We are “incorporating by reference” into this prospectus supplement information we file with the SEC. This means we are disclosing important information to you by referring you to the documents containing the information. The information we incorporate by reference is considered to be part of this prospectus supplement. Information that we file later with the SEC that is deemed incorporated by reference into this prospectus supplement (but not information deemed to be furnished to and not filed with the SEC) will automatically update and supersede information previously included.

      We are incorporating by reference into this prospectus supplement the documents listed below and any subsequent filings we make with the SEC under Sections 13(a), 13(c), 14 or 15(d) of the Securities Exchange Act of 1934 (excluding information deemed to be furnished and not filed with the SEC) until all the securities are sold:

      You may also obtain a copy of our filings with the SEC at no cost by writing to or telephoning us at the following address:

CenterPoint Energy Resources Corp.

c/o CenterPoint Energy, Inc.

Attn: Investor Relations

P.O. Box 4567

Houston, Texas 77210-4567

(713) 207-6500

PROSPECTUS

CenterPoint Energy Resources Corp.

1111 Louisiana

Houston, Texas 77002

(713) 207-1111

CenterPoint Energy Resources Corp.

$500,000,000

Senior Debt Securities

        We may offer and sell up to $500,000,000 of our debt securities in one or more series by using this prospectus. Unless we inform you otherwise in a supplement to this prospectus, our debt securities will be unsecured and will rank on a parity with all of our other unsecured and unsubordinated indebtedness. We will establish the terms for our debt securities at the time we sell them and we will describe them in one or more supplements to this prospectus. You should read this prospectus and the related supplement carefully before you invest in our debt securities. This prospectus may not be used to offer and sell our debt securities unless accompanied by a prospectus supplement.

      Neither the Securities and Exchange Commission nor any state securities commission has approved or disapproved of these securities or determined whether this prospectus is truthful or complete. Any representation to the contrary is a criminal offense.

The date of this prospectus is September 14, 2005.

      You should rely only on the information contained or incorporated by reference in this prospectus or any prospectus supplement. We have not authorized anyone to provide you with different information. We are not making an offer of these securities in any state where the offer is not permitted. You should not assume that the information contained in this prospectus or any prospectus supplement is accurate as of any date other than the date on the front of that document. Any information we have incorporated by reference is accurate only as of the date of the document incorporated by reference.

Table of Contents

About This Prospectus

      This prospectus is part of a registration statement we have filed with the SEC using a “shelf” registration process. Using this process, we may offer the securities described in this prospectus in one or more offerings with a total initial offering price of up to $500,000,000. This prospectus provides you with a general description of the securities we may offer. Each time we use this prospectus to offer securities, we will provide a supplement to this prospectus that will describe the specific terms of that offering. The prospectus supplement may also add to, update or change the information contained in this prospectus. You should carefully read this prospectus, the applicable prospectus supplement and the information contained in the documents we refer to under the heading “Where You Can Find More Information.”

      References in this prospectus to the terms “we,” “us,” “our” or other similar terms mean CenterPoint Energy Resources Corp. and its subsidiaries, and references to “CenterPoint Energy” mean our indirect parent, CenterPoint Energy, Inc., unless the context clearly indicates otherwise.

About CenterPoint Energy Resources Corp.

      We own gas distribution systems serving approximately 3 million customers in Arkansas, Louisiana, Minnesota, Mississippi, Oklahoma and Texas. Through wholly owned subsidiaries, we also own two interstate natural gas pipelines and gas gathering systems, provide various ancillary services, and offer variable and fixed price physical natural gas supplies to commercial and industrial customers and natural gas distributors. We are an indirect wholly owned subsidiary of CenterPoint Energy.

      CenterPoint Energy is a registered public utility holding company under the Public Utility Holding Company Act of 1935, as amended (1935 Act). The 1935 Act and related rules and regulations impose a number of restrictions on the activities of CenterPoint Energy and those of its subsidiaries, including us. The 1935 Act, among other things, limits the ability of CenterPoint Energy and its regulated subsidiaries, including us, to issue debt and equity securities without prior authorization, restricts the source of dividend payments to current and retained earnings without prior authorization, regulates sales and acquisitions of certain assets and businesses and governs affiliated service, sales and construction contracts. On August 8, 2005 President Bush signed the Energy Policy Act of 2005 (Energy Act), which, among other things, repeals the 1935 Act six months after the enactment of the Energy Act. After the effective date of repeal, CenterPoint Energy and its subsidiaries, including us, will no longer be subject to restrictions imposed under the 1935 Act. Until the repeal is effective, CenterPoint Energy and its subsidiaries remain subject to the provisions of the 1935 Act and the terms of orders issued by the SEC under the 1935 Act. The Energy Act transfers to the Federal Energy Regulatory Commission (FERC) certain functions performed by the SEC under the 1935 Act, including the requirement that holding companies and their subsidiaries maintain certain books and records and make them available for review by FERC and, through FERC, to state regulatory authorities. The Energy Act requires FERC to issue regulations to implement its jurisdiction under the Energy Act. It is presently unknown what, if any, specific obligations under those rules may be imposed on us as result of that rulemaking.

      Our principal executive offices are located at 1111 Louisiana, Houston, Texas 77002, and our main telephone number at that address is 713-207-1111.

Recent Developments

      In late August 2005, Hurricane Katrina struck the Gulf Coast of the United States, including Louisiana and Mississippi, causing extensive damage. A number of our natural gas customers were affected by the storm and some of our facilities were damaged. Although the customers and facilities affected were a comparatively small portion of our total system, we expect to experience the loss of some customers and to incur additional expenditures to repair and reconstruct facilities in order to restore service. At this time, we cannot determine the impact, if any, that this storm will have on our financial condition or results of operations.

Cautionary Statement Regarding Forward-Looking Information

      In this prospectus, including the information we incorporate by reference, we make statements concerning our expectations, beliefs, plans, objectives, goals, strategies, future events or performance and underlying assumptions and other statements that are not historical facts. These statements are “forward-looking statements” within the meaning of the Private Securities Litigation Reform Act of 1995. Actual results may differ materially from those expressed or implied by these statements. You can generally identify our forward-looking statements by the words “anticipate,” “believe,” “continue,” “could,” “estimate,” “expect,” “forecast,” “goal,” “intend,” “may,” “objective,” “plan,” “potential,” “predict,” “projection,” “should,” “will” or other similar words.

      We have based our forward-looking statements on our management’s beliefs and assumptions based on information available to our management at the time the statements are made. We caution you that assumptions, beliefs, expectations, intentions and projections about future events may and often do vary materially from actual results. Therefore, we cannot assure you that actual results will not differ materially from those expressed or implied by our forward-looking statements.

      The following are some of the factors that could cause actual results to differ materially from those expressed or implied in forward-looking statements:

      Additional risk factors are described in other documents we file with the SEC and incorporate by reference in this prospectus.

      You should not place undue reliance on forward-looking statements. Each forward-looking statement speaks only as of the date of the particular statement.

Ratios of Earnings to Fixed Charges

      The following table sets forth our ratios of earnings from continuing operations to fixed charges for each of the periods indicated.

Use of Proceeds

      Unless we inform you otherwise in the prospectus supplement, we anticipate using any net proceeds from the sale of our securities offered by this prospectus for general corporate purposes. These purposes may include, but are not limited to:

Pending any specific application, we may initially invest funds in short-term marketable securities or apply them to the reduction of short-term indebtedness.

Description of Our Senior Debt Securities

      The Senior Debt Securities offered by this prospectus will be issued under an indenture, dated as of February 1, 1998, as supplemented, between us and JPMorgan Chase Bank, National Association (formerly Chase Bank of Texas, National Association), as trustee. We have filed the indenture as an exhibit to the registration statement of which this prospectus is a part. We have summarized selected provisions of the indenture and the Senior Debt Securities below. This summary is not complete and is qualified in its entirety by reference to the indenture. References to section numbers in this prospectus, unless otherwise indicated, are references to section numbers of the indenture. For purposes of this summary, the terms “we,” “our,” “ours,” and “us” refer only to CenterPoint Energy Resources Corp. and not to any of our subsidiaries.

      We may issue debt securities from time to time in one or more series under the indenture. There is no limitation on the amount of debt securities we may issue under the indenture. We will describe the particular terms of each series of debt securities we offer in a supplement to this prospectus. The terms of our debt securities will include those set forth in the indenture and those made a part of the indenture by the Trust Indenture Act of 1939. You should carefully read the summary below, the applicable prospectus supplement and the provisions of the indenture that may be important to you before investing in our debt securities.

Ranking

      The debt securities offered by this prospectus will:

      Subject to the exceptions, and subject to compliance with the applicable requirements, set forth in the indenture, we may discharge our obligations under the indenture with respect to our debt securities as described below under “— Defeasance.”

Terms

      We may issue debt securities in separate series from time to time under the indenture. The total principal amount of debt securities that may be issued under the indenture is unlimited. Our 6¹/2 % Debentures due February 1, 2008 ($300 million outstanding as of July 31, 2005), our 7.75% Notes due 2011 ($550 million outstanding as of July 31, 2005)), our 7.875% Notes due 2013 ($762 million outstanding as of July 31, 2005)) and our 5.95% Notes due 2014 ($160 million outstanding as of July 31, 2005) are currently outstanding under the indenture. We may limit the maximum total principal amount for the debt securities of any series. However, any limit may be increased by resolution of our board of directors. (Section 301) We will establish the terms of each series of debt securities, which may not be inconsistent with the indenture, in a supplemental indenture.

      We will describe the specific terms of the series of debt securities being offered in a supplement to this prospectus. These terms will include some or all of the following:

      We may sell the debt securities, including original issue discount securities, at a substantial discount below their stated principal amount. If there are any special United States federal income tax considerations applicable to debt securities we sell at an original issue discount, we will describe them in the prospectus supplement. In addition, we will describe in the prospectus supplement any special United States federal

income tax considerations and any other special considerations for any debt securities we sell which are denominated in a currency or currency unit other than $U.S.

Form, Exchange and Transfer

      We will issue the debt securities in registered form, without coupons. Unless we inform you otherwise in the prospectus supplement, we will only issue debt securities in denominations of integral multiples of $1,000. (Section 302)

      Holders generally will be able to exchange debt securities for other debt securities of the same series with the same total principal amount and the same terms but in different authorized denominations. (Section 305)

      Holders may present debt securities for exchange or for registration of transfer at the office of the security registrar or at the office of any transfer agent we designate for that purpose. The security registrar or designated transfer agent will exchange or transfer the debt securities if it is satisfied with the documents of title and identity of the person making the request. We will not charge a service charge for any exchange or registration of transfer of debt securities. However, we may require payment of a sum sufficient to cover any tax or other governmental charge payable for the registration of transfer or exchange. Unless we inform you otherwise in the prospectus supplement, we will appoint the trustee as security registrar. We will identify any transfer agent in addition to the security registrar in the prospectus supplement. (Section 305) At any time we may:

      However, we are required to maintain a transfer agent in each place of payment for the debt securities at all times. (Sections 305 and 1002)

      If we elect to redeem a series of debt securities, neither we nor the trustee will be required:

Book-Entry

      We may issue the debt securities of a series in the form of one or more global debt securities that would be deposited with a depositary or its nominee identified in the prospectus supplement. We may issue global debt securities in either temporary or permanent form. We will describe in the prospectus supplement the terms of any depositary arrangement and the rights and limitations of owners of beneficial interests in any global debt security.

Payment and Paying Agents

      Under the indenture, we will pay interest on the debt securities to the persons in whose names the debt securities are registered at the close of business on the regular record date for each interest payment. However, unless we inform you otherwise in the prospectus supplement, we will pay the interest payable on the debt securities at their stated maturity to the persons to whom we pay the principal amount of the debt securities. The initial payment of interest on any series of debt securities issued between a regular record date and the related interest payment date will be payable in the manner provided by the terms of the series, which we will describe in the prospectus supplement. (Section 307)

      Unless we inform you otherwise in the prospectus supplement, we will pay principal, premium, if any, and interest on the debt securities at the offices of the paying agents we designate. However, except in the case of a global security, we may pay interest by:

We will designate the trustee as the sole paying agent for the debt securities unless we inform you otherwise in the prospectus supplement. If we initially designate any other paying agents for a series of debt securities, we will identify them in the prospectus supplement. At any time, we may designate additional paying agents or rescind the designation of any paying agents. However, we are required to maintain a paying agent in each place of payment for the debt securities at all times. (Sections 307 and 1002)

      Any money deposited with the trustee or any paying agent for the payment of principal, premium, if any, and interest on the debt securities that remains unclaimed for two years after the date the payments became due, may be repaid to us upon our request. After we have been repaid, holders entitled to those payments may only look to us for payment as our unsecured general creditors. The trustee and any paying agents will not be liable for those payments after we have been repaid. (Section 1003)

Restrictive Covenants

      We will describe any restrictive covenants for any series of debt securities in the prospectus supplement.

Consolidation, Merger and Sale of Assets

      Under the indenture, we may not consolidate with or merge into, or convey, transfer or lease our properties and assets substantially as an entirety, to any person, referred to as a “successor person,” and we may not permit any person to consolidate with or merge into, or convey, transfer or lease its properties and assets substantially as an entirety to us, unless:

      As used in the indenture, the term “corporation” means a corporation, association, company, joint-stock company or business trust.

Events of Default

      Unless we inform you otherwise in the prospectus supplement, each of the following will be an event of default under the indenture for a series of debt securities:

provided, however, that no event described in the fourth, fifth or sixth bullet points above will be an event of default until an officer of the trustee, assigned to and working in the trustee’s corporate trust department, has actual knowledge of the event or until the trustee receives written notice of the event at its corporate trust office, and the notice refers to the debt securities generally, us or the indenture. (Section 501)

      If an event of default for a series of debt securities occurs and is continuing, either the trustee or the holders of at least 25% in principal amount of the outstanding debt securities of that series may declare the principal amount of all the debt securities of that series due and immediately payable. In order to declare the principal amount of that series of debt securities due and immediately payable, the trustee or the holders must deliver a notice that satisfies the requirements of the indenture. Upon a declaration by the trustee or the holders, we will be obligated to pay the principal amount of the series of debt securities.

      The right described in the preceding paragraph does not apply if:

If any of these events of default occurs and is continuing, either the trustee or holders of at least 25% in principal amount of all of the debt securities then outstanding, treated as one class, may declare the principal amount of all of the debt securities then outstanding to be due and payable immediately. In order to declare the principal amount of the debt securities due and immediately payable, the trustee or the holders must deliver a notice that satisfies the requirements of the indenture. Upon a declaration by the trustee or the holders, we will be obligated to pay the principal amount of the debt securities.

      However, after any declaration of acceleration of a series of debt securities, but before a judgment or decree for payment has been obtained, the holders of a majority in principal amount of the outstanding debt securities of that series may rescind and annul the declaration of acceleration if:

      If an event of default occurs and is continuing, the trustee will generally have no obligation to exercise any of its rights or powers under the indenture at the request or direction of any of the holders, unless the holders offer reasonable indemnity to the trustee. (Section 603) The holders of a majority in principal amount of the outstanding debt securities of any series will generally have the right to direct the time, method and

place of conducting any proceeding for any remedy available to the trustee or exercising any trust or power conferred on the trustee for the debt securities of that series, provided that:

      A holder of a debt security of any series may only pursue a remedy under the indenture if:

However, these limitations do not apply to a suit by a holder of a debt security demanding payment of the principal, premium, if any, or interest on a debt security on or after the date the payment is due. (Section 508)

      We will be required to furnish to the trustee annually a statement by some of our officers regarding our performance or observance of any of the terms of the indenture and specifying all of our known defaults, if any. (Section 1004)

Modification and Waiver

      We may enter into one or more supplemental indentures with the trustee without the consent of the holders of the debt securities in order to:

      We may enter into one or more supplemental indentures with the trustee in order to add to, change or eliminate provisions of the indenture or to modify the rights of the holders of one or more series of debt securities if we obtain the consent of the holders of a majority in principal amount of the outstanding debt securities of each series affected by the supplemental indenture, treated as one class. However, without the consent of the holders of each outstanding debt security affected by the supplemental indenture, we may not enter into a supplemental indenture that:

      Holders of a majority in principal amount of the outstanding debt securities of any series may waive past defaults or noncompliance with restrictive provisions of the indenture. However, such holders of a majority in principal amount may not waive, and consequently, the consent of holders of each outstanding debt security of a series would be required to:

      In order to determine whether the holders of the requisite principal amount of the outstanding debt securities have taken an action under the indenture as of a specified date:

An “original issue discount security” means a debt security issued under the indenture which provides for an amount less than the principal amount thereof to be due and payable upon a declaration of acceleration of maturity. Some debt securities, including those for the payment or redemption of which money has been deposited or set aside in trust for the holders and those that have been fully defeased pursuant to Section 1402 of the indenture, will not be deemed to be outstanding. (Section 101)

      We will generally be entitled to set any day as a record date for determining the holders of outstanding debt securities of any series entitled to give or take any direction, notice, consent, waiver or other action under the indenture. In limited circumstances, the trustee will be entitled to set a record date for action by holders of outstanding debt securities. If a record date is set for any action to be taken by holders of a particular series, the action may be taken only by persons who are holders of outstanding debt securities of that series on the record date. To be effective, the action must be taken by holders of the requisite principal amount of debt securities within a specified period following the record date. For any particular record date, this period will be 180 days or such shorter period as we may specify, or the trustee may specify, if it set the record date. This period may be shortened or lengthened by not more than 180 days. (Section 104)

Defeasance

      When we use the term defeasance, we mean discharge from some or all of our obligations under the indenture. Unless we inform you otherwise in the prospectus supplement, if we deposit with the trustee funds or government securities sufficient to make payments on the debt securities of a series on the dates those payments are due and payable, then, at our option, either of the following will occur:

      If we defease a series of debt securities, the holders of the debt securities of the series affected will not be entitled to the benefits of the indenture, except for our obligations to:

      Unless we inform you otherwise in the prospectus supplement, we will be required to deliver to the trustee an opinion of counsel that the deposit and related defeasance would not cause the holders of the debt securities to recognize gain or loss for federal income tax purposes and that the holders would be subject to federal income tax on the same amounts, in the same manner and at the same times as would have been the case if the deposit and related defeasance had not occurred. If we elect legal defeasance, that opinion of counsel must be based upon a ruling from the United States Internal Revenue Service or a change in law to that effect. (Sections 1401, 1402, 1403 and 1404)

Satisfaction And Discharge

      We may discharge our obligations under the indenture while debt securities remain outstanding if (1) all outstanding debt securities issued under the indenture have become due and payable, (2) all outstanding debt securities issued under the indenture have or will become due and payable at their scheduled maturity within one year or (3) all outstanding debt securities issued under the indenture are scheduled for redemption in one year, and in each case, we have deposited with the trustee an amount sufficient to pay and discharge all outstanding debt securities issued under the indenture on the date of their scheduled maturity or the scheduled date of redemption and we have paid all other sums payable under the Indenture. (Section 401)

Notices

      Holders will receive notices by mail at their addresses as they appear in the security register. (Section 106)

Title

      We may treat the person in whose name a debt security is registered on the applicable record date as the owner of the debt security for all purposes, whether or not it is overdue. (Section 309)

Governing Law

      New York law will govern the indenture and the debt securities. (Section 112)

Regarding the Trustee

      JPMorgan Chase Bank, National Association, is the trustee, security registrar and paying agent under the indenture. As of July 31, 2005, the trustee served as trustee for approximately $1.8 billion aggregate principal amount of our debt securities. In addition, the trustee serves as trustee or fiscal agent for debt securities of our affiliates aggregating approximately $7.3 billion as of July 31, 2005.

      The trustee and its affiliates are parties to credit agreements under which we and our affiliates have bank lines of credit. We and our affiliates maintain depository and other banking, investment banking and investment management relationships with the trustee and its affiliates.

      If an event of default occurs under the indenture and is continuing, the trustee will be required to use the degree of care and skill of a prudent person in the conduct of that person’s own affairs. The trustee will become obligated to exercise any of its powers under the indenture at the request of any of the holders of any debt securities issued under the indenture only after those holders have offered the trustee indemnity satisfactory to it.

      If the trustee becomes one of our creditors, its rights to obtain payment of claims in specified circumstances, or to realize for its own account on certain property received in respect of any such claim as security or otherwise will be limited under the terms of the indenture pursuant to the provisions of the Trust Indenture Act. (Section 613) The trustee may engage in certain other transactions; however, if the trustee acquires any conflicting interest (within the meaning specified under the Trust Indenture Act), it will be required to eliminate the conflict or resign. (Section 608)

Plan of Distribution

      We may sell the offered securities in and outside the United States:

      The prospectus supplement will include the following information:

Sale Through Underwriters or Dealers

      If we use underwriters in the sale, the underwriters will acquire the securities for their own account. The underwriters may resell the securities from time to time in one or more transactions, including negotiated transactions, at a fixed public offering price or at varying prices determined at the time of sale. Underwriters may offer securities to the public either through underwriting syndicates represented by one or more managing underwriters or directly by one or more firms acting as underwriters. Unless we inform you otherwise in the prospectus supplement, the obligations of the underwriters to purchase the securities will be subject to certain conditions, and the underwriters will be obligated to purchase all the offered securities if they purchase any of them. The underwriters may change from time to time any initial public offering price and any discounts or concessions allowed or reallowed or paid to dealers.

      During and after an offering through underwriters, the underwriters may purchase and sell the securities in the open market. These transactions may include overallotment and stabilizing transactions and purchases to cover syndicate short positions created in connection with the offering. The underwriters also may impose a penalty bid, which means that selling concessions allowed to syndicate members or other broker-dealers for the offered securities sold for their account may be reclaimed by the syndicate if the offered securities are repurchased by the syndicate in stabilizing or covering transactions. These activities may stabilize, maintain or otherwise affect the market price of the offered securities, which may be higher than the price that might otherwise prevail in the open market. If commenced, the underwriters may discontinue these activities at any time.

      If we use dealers in the sale of securities, we will sell the securities to them as principals. They may then resell those securities to the public at varying prices determined by the dealers at the time of resale. The dealers participating in any sale of the securities may be deemed to be underwriters within the meaning of the Securities Act of 1933 with respect to any sale of these securities. We will include in the prospectus supplement the names of the dealers and the terms of the transaction.

Direct Sales and Sales Through Agents

      We may sell the securities directly. In that event, no underwriters or agents would be involved. We may also sell the securities through agents we designate from time to time. In the prospectus supplement, we will name any agent involved in the offer or sale of the offered securities, and we will describe any commissions

payable by us to the agent. Unless we inform you otherwise in the prospectus supplement, any agent will agree to use its reasonable best efforts to solicit purchases for the period of its appointment.

      We may sell the securities directly to institutional investors or others who may be deemed to be underwriters within the meaning of the Securities Act of 1933 with respect to any sale of those securities. We will describe the terms of any such sales in the prospectus supplement.

Delayed Delivery Contracts

      If we so indicate in the prospectus supplement, we may authorize agents, underwriters or dealers to solicit offers from certain types of institutions to purchase securities from us at the public offering price under delayed delivery contracts. These contracts would provide for payment and delivery on a specified date in the future. The contracts would be subject only to those conditions described in the prospectus supplement. The prospectus supplement will describe the commission payable for solicitation of those contracts.

Remarketing

      We may offer and sell any of the offered securities in connection with a remarketing upon their purchase, in accordance with a redemption or repayment by their terms or otherwise by one or more remarketing firms acting as principals for their own accounts or as our agents. We will identify any remarketing firm, the terms of any remarketing agreement and the compensation to be paid to the remarketing firm in the prospectus supplement. Remarketing firms may be deemed underwriters under the Securities Act of 1933.

Derivative Transactions

      We may enter into derivative transactions with third parties, or sell securities not covered by this prospectus to third parties in privately negotiated transactions. If the applicable prospectus supplement indicates, in connection with those derivatives, the third parties may sell securities covered by this prospectus and the applicable prospectus supplement, including in short sale transactions. If so, the third parties may use securities pledged by us or borrowed from us or others to settle those sales or to close out any related open borrowings of stock, and may use securities received from us in settlement of those derivatives to close out any related open borrowings of stock. The third parties in these sale transactions will be underwriters and will be identified in the applicable prospectus supplement or in a post-effective amendment to the registration statement of which this prospectus forms a part.

General Information

      We may have agreements with the agents, dealers and underwriters to indemnify them against certain civil liabilities, including liabilities under the Securities Act of 1933, or to contribute with respect to payments that the agents, dealers or underwriters may be required to make. Agents, dealers and underwriters may be customers of, engage in transactions with or perform services for us in the ordinary course of their businesses.

      Each series of offered securities will be a new issue and will have no established trading market. We may elect to list any series of offered securities on an exchange, but we are not obligated to do so. It is possible that one or more underwriters may make a market in a series of offered securities. However, they will not be obligated to do so and may discontinue market making at any time without notice. We cannot assure you that a liquid trading market for any of our offered securities will develop.

Legal Matters

      The validity of the securities described in this prospectus will be passed upon for us by Baker Botts L.L.P., Houston, Texas. Scott E. Rozzell, Esq., our Executive Vice President, General Counsel and Corporate Secretary, or Rufus S. Scott, our Vice President, Deputy General Counsel and Assistant Corporate Secretary, may pass upon other legal matters for us. Any underwriters will be advised about the validity of our debt securities and other matters by Dewey Ballantine LLP.

Experts

      The consolidated financial statements and the related financial statement schedule incorporated in this prospectus by reference from our Annual Report on Form 10-K for the year ended December 31, 2004, as amended, have been audited by Deloitte & Touche LLP, an independent registered public accounting firm, as stated in their reports, which are incorporated herein by reference, and have been so incorporated in reliance upon the reports of such firm given upon their authority as experts in accounting and auditing.

Where You Can Find More Information

      We file annual, quarterly and current reports and other information with the SEC. You may read and copy any document we file with the SEC at the SEC’s public reference room located at 100 F Street, N.E., Washington, D.C. 20549. You may obtain further information regarding the operation of the SEC’s public reference room by calling the SEC at 1-800-SEC-0330. Our filings are also available to the public on the SEC’s Internet site located at http://www.sec.gov. You can obtain information about us at the offices of the New York Stock Exchange, 20 Broad Street, New York, New York 10005.

      This prospectus is part of a registration statement we have filed with the SEC relating to the securities we may offer. As permitted by SEC rules, this prospectus does not contain all of the information we have included in the registration statement and the accompanying exhibits and schedules we file with the SEC. You may refer to the registration statement, the exhibits and the schedules for more information about us and our securities. The registration statement, exhibits and schedules are available at the SEC’s public reference room or through its Internet site.

      We are “incorporating by reference” into this prospectus information we file with the SEC. This means we are disclosing important information to you by referring you to the documents containing the information. The information we incorporate by reference is considered to be part of this prospectus. Information that we file later with the SEC that is deemed incorporated by reference into this prospectus (but not information deemed to be furnished to and not filed with the SEC) will automatically update and supersede information previously included.

      We are incorporating by reference into this prospectus the documents listed below and any subsequent filings we make with the SEC under Sections 13(a), 13(c), 14 or 15(d) of the Securities Exchange Act of 1934 (excluding information deemed to be furnished and not filed with the SEC) until all the securities are sold:

      You may also obtain a copy of our filings with the SEC at no cost by writing to or telephoning us at the following address:

CenterPoint Energy Resources Corp.

c/o CenterPoint Energy, Inc.

Attn: Investor Relations

P.O. Box 4567

Houston, Texas 77210-4567

(713) 207-6500

$325,000,000

CENTERPOINT ENERGY RESOURCES CORP.

% Senior Notes due 2016

PROSPECTUS SUPPLEMENT

May        , 2006

RBS Greenwich Capital

SunTrust Robinson Humphrey

Wells Fargo Securities