UNITED STATES

SECURITIES AND EXCHANGE COMMISSION

Washington, D.C. 20549

Form 10-Q

(Mark One)

[X]

QUARTERLY REPORT PURSUANT TO SECTION 13 OR 15(d)

OF THE SECURITIES EXCHANGE ACT OF 1934

For the quarterly period ended March 31, 2005

OR

[  ]

TRANSITION REPORT PURSUANT TO SECTION 13 OR 15(d)

OF THE SECURITIES EXCHANGE ACT OF 1934

For the transition period from           to           

Commission File Number 333-106586

El Paso Production Holding Company

(Exact Name of Registrant as Specified in its Charter)

Telephone Number: (713) 420-2600

     Indicate by check mark whether the registrant (1) has filed all reports required to be filed by Section 13 or 15(d) of the Securities Exchange Act of 1934 during the preceding 12 months (or for such shorter period that the registrant was required to file such reports), and (2) has been subject to such filing requirements for the past 90 days.  Yes þ No o

     Indicate by check mark whether the registrant is an accelerated filer (as defined in Rule 12b-2 of the Exchange Act).  Yes o No þ

     Indicate the number of shares outstanding of each of the issuer’s classes of common stock, as of the latest practicable date.

      Common stock, par value $1 per share. Shares outstanding on May 12, 2005: 1,000

      EL PASO PRODUCTION HOLDING COMPANY MEETS THE CONDITIONS OF GENERAL INSTRUCTION H(1)(a) AND (b) TO FORM 10-Q AND IS THEREFORE FILING THIS REPORT WITH A REDUCED DISCLOSURE FORMAT AS PERMITTED BY SUCH INSTRUCTION.

EL PASO PRODUCTION HOLDING COMPANY

TABLE OF CONTENTS

      Below is a list of terms that are common to our industry and used throughout this document:

     When we refer to natural gas and oil in “equivalents,” we are doing so to compare quantities of oil with quantities of natural gas or to express these different commodities in a common unit. In calculating equivalents, we use a generally recognized standard in which one Bbl of oil is equal to six Mcf of natural gas. Also, when we refer to cubic feet measurements, all measurements are at a pressure of 14.73 pounds per square inch.

     When we refer to “us”, “we”, “our”, “ours”, or “El Paso Production”, we are describing El Paso Production Holding Company and/or our subsidiaries.

PART I — FINANCIAL INFORMATION

Item 1. Financial Statements

EL PASO PRODUCTION HOLDING COMPANY

CONDENSED CONSOLIDATED STATEMENTS OF INCOME

(In millions)

(Unaudited)

See accompanying notes.

EL PASO PRODUCTION HOLDING COMPANY

CONDENSED CONSOLIDATED BALANCE SHEETS

(In millions, except share amounts)

(Unaudited)

See accompanying notes.

EL PASO PRODUCTION HOLDING COMPANY

CONDENSED CONSOLIDATED STATEMENTS OF CASH FLOWS

(In millions)

(Unaudited)

See accompanying notes.

EL PASO PRODUCTION HOLDING COMPANY

CONDENSED CONSOLIDATED STATEMENTS OF COMPREHENSIVE LOSS

(In millions)

(Unaudited)

See accompanying notes.

EL PASO PRODUCTION HOLDING COMPANY

NOTES TO CONDENSED CONSOLIDATED FINANCIAL STATEMENTS

(Unaudited)

1. Basis of Presentation and Significant Accounting Policies

  Basis of Presentation

      We are a wholly owned subsidiary of El Paso Corporation (El Paso). We prepared this Quarterly Report on Form 10-Q under the rules and regulations of the United States Securities and Exchange Commission (SEC). Because this is an interim period filing presented using a condensed format, it does not include all of the disclosures required by generally accepted accounting principles. You should read this Quarterly Report on Form 10-Q along with our 2004 Annual Report on Form 10-K, which includes a summary of our significant accounting policies and other disclosures. The financial statements as of March 31, 2005, and for the quarters ended March 31, 2005 and 2004, are unaudited. We derived the balance sheet as of December 31, 2004, from the audited balance sheet filed in our 2004 Annual Report on Form 10-K. In our opinion, we have made all adjustments which are of a normal, recurring nature to fairly present our interim period results. Due to the seasonal nature of our business, information for interim periods may not be indicative of our results of operations for the entire year. In addition, prior period information presented in these financial statements includes reclassifications which were made to conform to the current period presentation. These reclassifications had no effect on our previously reported net income or stockholder’s equity.

  Significant Accounting Policies

      Our significant accounting policies are consistent with those discussed in our 2004 Annual Report on Form 10-K.

2. Acquisitions

      In the first quarter of 2005, we acquired a 100 percent equity interest in GMT Energy Corp (GMT), a company engaged in the exploration, development and production of natural gas and oil in east Texas, for approximately $173 million (net of cash acquired). In addition, during the first quarter of 2005, we acquired properties in south Texas for approximately $33 million and we purchased the interest held by one of the parties under a net profits interest agreement for approximately $40 million. These acquisitions added properties with approximately 131 Bcfe of existing proved reserves and 48 MMcfe/d of current production.

      The GMT acquisition was treated as a business combination accounted for using the purchase method of accounting and the purchase price was assigned to natural gas and oil properties in our full cost pool in the amount of approximately $266 million, accounts payable in the amount of approximately $5 million, and noncurrent deferred tax liabilities of approximately $88 million. No goodwill was recorded in the transaction. Results of operations since the date of acquisition, which was February 25, 2005, have been included in the accompanying consolidated financial statements. The following summary presents unaudited proforma consolidated results of operations for the quarters ended March 31, 2005 and 2004 as if the acquisition had occurred as of the beginning of the periods presented. The proforma results include adjustments for depreciation, depletion and amortization based on the purchase price allocated to the properties and the related income tax effect, assuming a 35% effective rate, and are not necessarily indicative of the operating results that would have occurred had the acquisition been consummated at that date, nor are they necessarily indicative of future operating results.

3. Commitments and Contingencies

      Grynberg. In 1997, a number of El Paso entities, including our subsidiary, El Paso Production Company, were named defendants in actions brought by Jack Grynberg on behalf of the U.S. Government under the False Claims Act. Generally, these complaints allege an industry-wide conspiracy to underreport the heating value as well as the volumes of the natural gas produced from federal and Native American lands, which deprived the U.S. Government of royalties. The plaintiff in this case seeks royalties that he contends the government should have received had the volume and heating value been differently measured, analyzed, calculated and reported, together with interest, treble damages, civil penalties, expenses and future injunctive relief to require the defendants to adopt allegedly appropriate gas measurement practices. No monetary relief has been specified in this case. These matters have been consolidated for pretrial purposes (In re: Natural Gas Royalties Qui Tam Litigation, U.S. District Court for the District of Wyoming, filed June 1997). Motions to dismiss have been briefed and argued and the parties are awaiting the court’s ruling. Our costs and legal exposure related to these lawsuits and claims are not currently determinable.

      Will Price (formerly Quinque). A number of El Paso entities, including our subsidiary, El Paso Production Company, are named as defendants in Will Price et al v. Gas Pipelines and Their Predecessors, et al., filed in 1999 in the District Court of Stevens County, Kansas. Plaintiffs allege that the defendants mismeasured natural gas volumes and heating content of natural gas on non-federal and non-Native American lands and seek to recover royalties that they contend they should have received had the volume and heating value of natural gas produced from their properties been differently measured, analyzed, calculated and reported, together with prejudgment and postjudgment interest, punitive damages, treble damages, attorneys’ fees, costs and expenses, and future injunctive relief to require the defendants to adopt allegedly appropriate gas measurement practices. No monetary relief has been specified in this case. Plaintiffs’ motion for class certification of a nationwide class of natural gas working interest owners and natural gas royalty owners was denied in April 2003. Plaintiffs were granted leave to file a Fourth Amended Petition, which narrows the proposed class to royalty owners in wells in Kansas, Wyoming and Colorado and removes claims as to heating content. A second class action petition has since been filed as to the heating content claims. Motions for class certification have been briefed and argued in both proceedings, and the parties are awaiting the court’s ruling. Our costs and legal exposure related to these lawsuits and claims are not currently determinable.

      Reserve Revisions. In March 2004, El Paso received a subpoena from the SEC requesting documents relating to its December 31, 2003 natural gas and oil reserve revisions. El Paso and its Audit Committee have also received federal grand jury subpoenas for documents with regard to these reserve revisions. We are assisting El Paso and its Audit Committee in their efforts to cooperate with the SEC’s and the U.S. Attorney’s investigations into this matter.

      In addition to the above matters, we and our subsidiaries and affiliates are named defendants in numerous lawsuits and governmental proceedings that arise in the ordinary course of our business.

      Raton. During the third quarter of 2004, we discovered that the supplier of electricity to our Raton field in New Mexico may have underbilled us for electricity usage during the last two years. We are currently reviewing information concerning this matter and do not expect this matter to have a significant impact on our financial statements.

      For each of our outstanding legal and other contingent matters, we evaluate the merits of the case, our exposure to the matter, possible legal or settlement strategies and the likelihood of an unfavorable outcome. If we determine that an unfavorable outcome is probable and can be estimated, we establish the necessary accruals. While the outcome of these matters cannot be predicted with certainty and there are still uncertainties related to the costs we may incur, based upon our evaluation and experience to date, we believe we have established appropriate reserves for these matters. However, it is possible that new information or future developments could require us to reassess our potential exposure related to these matters and adjust our

accruals accordingly. As of March 31, 2005, we had approximately $4 million accrued for all outstanding legal and other contingent matters.

      We are subject to federal, state and local laws and regulations governing environmental quality and pollution control. These laws and regulations require us to remove or remedy the effect on the environment of the disposal or release of specified substances at current and former operating sites. At March 31, 2005, we had no accrual for remediation costs and associated onsite, offsite and groundwater technical studies or for related environmental legal costs.

      Air Permit Violation. In March 2003, the Louisiana Department of Environmental Quality (LDEQ) issued a Consolidated Compliance Order and Notice of Potential Penalty to our subsidiary, El Paso Production Company, alleging that it failed to timely obtain air permits for specified oil and gas facilities. El Paso Production Company requested an adjudicatory hearing on the matter. The hearing has been stayed by agreement to allow El Paso Production Company and the LDEQ time to possibly settle this matter. Negotiations are ongoing for resolving this matter.

      It is possible that new information or future developments could require us to reassess our potential exposure related to environmental matters. We may incur significant costs and liabilities in order to comply with existing environmental laws and regulations. It is also possible that other developments, such as increasingly strict environmental laws, regulations and orders of regulatory agencies, as well as claims for damages to property and the environment or injuries to employees and other persons, resulting from our current or past operations, could result in substantial costs and liabilities in the future. As this information becomes available, or other relevant developments occur, we will adjust our accrual amounts accordingly. While there are still uncertainties relating to the ultimate costs we may incur, based upon our evaluation and experience to date, we believe no reserves are required at this time.

   Guarantees. In April 2005, we entered into a financial guarantee with the Minerals Management Services that obligates us to make payments for the offshore operations of our affiliate, El Paso CGP Company (El Paso CGP) if El Paso CGP fails to make its required payments for oil spills and plug and abandonment obligations. El Paso CGP has agreed to reimburse us for any costs we incur associated with this guarantee and has established a $10 million escrow account to cover their obligations. However, we may be responsible for any costs not reimbursed. We negotiated the guarantee on an arms length basis and obtained a third party fairness opinion.

      Cash Management Program. Subject to limitations in our indenture, we participate in El Paso’s cash management program which matches short-term cash surpluses and needs of its participating affiliates, thus minimizing total borrowing from outside sources. At March 31, 2005 and December 31, 2004, we had a receivable from El Paso of $459 million and $477 million. We classified $42 million and $145 million of this receivable as a current note receivable from affiliate on our balance sheets at March 31, 2005 and December 31, 2004. The interest rate on this receivable was 3.5% at March 31, 2005 and 2.0% at December 31, 2004.

      Taxes. We are party to a tax accrual policy with El Paso whereby El Paso files U.S. and state tax returns on our behalf. In certain states, we file and pay directly to the state taxing authorities. We have current federal income taxes receivable of $26 million and $15 million included in other current assets on our balance sheets at March 31, 2005 and December 31, 2004. Additionally, we have non-current federal income taxes receivable of $32 million included in other non-current assets at March 31, 2005 and December 31, 2004, on our balance sheets. We have state income taxes payable of $8 million at December 31, 2004, included in other current liabilities on our balance sheets. The majority of these balances will become payable to or receivable from El Paso.

      Capital Contribution. In the first quarter of 2005, El Paso contributed approximately $79 million to us to partially fund the acquisition of GMT.

      Other Affiliate Balances. At March 31, 2005 and December 31, 2004, we billed our affiliate $7 million and $92 million for sales of natural gas. In addition, we had payables to our affiliates of $29 million at March 31, 2005.

      At March 31, 2005 and December 31, 2004 we had contractual deposits of $5 million with El Paso’s regulated interstate pipelines.

      Affiliate Revenues and Expenses. We enter into a number of transactions with affiliates in the ordinary course of conducting our business. The following table shows revenues and charges to/from our affiliates for the quarters ended March 31:

      We have also entered into a service agreement with El Paso that provides for a reimbursement of 2.5 cents per MMBtu in 2005 and 2006 for our expected administrative costs associated with hedging transactions we entered into in December 2004.

Item 2. Management’s Discussion and Analysis of Financial Condition and Results of Operations

      The information contained in Item 2 updates, and should be read in conjunction with, information disclosed in our 2004 Annual Report on Form 10-K, and the financial statements and notes presented in Item 1 of this Quarterly Report on Form 10-Q.

Results of Operations

      Our management, as well as El Paso’s management, uses earnings before interest expense and income taxes (EBIT) to assess the operating results and effectiveness of our business. We define EBIT as net income adjusted for (i) items that do not impact our income from continuing operations, (ii) income taxes, (iii) interest and debt expense and (iv) affiliated interest income. Our business consists of consolidated operations as well as an investment in an unconsolidated affiliate. We exclude interest and debt expense from this measure so that our management can evaluate our operating results without regard to our financing methods. We believe the discussion of our results of operations based on EBIT is useful to our investors because it allows them to more effectively evaluate the operating performance of both our consolidated business and our unconsolidated investment using the same performance measure analyzed internally by our management. EBIT may not be comparable to measurements used by other companies. Additionally, EBIT should be considered in conjunction with net income and other performance measures such as operating income or operating cash flow.

Overview

      We conduct natural gas and oil exploration and production activities. Our operating results are driven by a variety of factors including the ability to locate and develop economic natural gas and oil reserves, extract those reserves with minimal production costs, sell the products at attractive prices, and minimize our total administrative costs. During the first quarter of 2005, we continued in our efforts to stabilize production by improving the production mix across our operating areas through a more balanced allocation of our capital to development and exploration projects, supplemented by acquisition activities with low risk development locations that provide operating synergies with our existing operations.

Operational Factors Affecting the Quarter Ended March 31, 2005

      During the first quarter of 2005, we continued to benefit from a strong commodity price environment. Our production volumes were relatively stable from the third and fourth quarters of 2004; however, production volumes for the quarter ended March 31, 2005 were lower than production volumes for the quarter ended March 31, 2004, due to normal production declines and lower capital spending programs over the last several years, combined with limited drilling success. Specifically, during the quarter ended March 31, 2005, we experienced:

Outlook for Remainder of 2005

      For the second quarter of 2005, we estimate that approximately 55 percent of our anticipated natural gas production will be hedged at an average price of $3.21 per MMBtu, which is significantly lower than current market prices for natural gas and will continue to affect revenues. We expect our depletion rate to increase to $2.14/Mcfe in the second quarter of 2005 from $2.09/Mcfe in the first quarter of 2005 due to higher finding and development costs and the cost of our recent acquisitions.

Production Hedge Position

      As part of our overall strategy, we hedge our natural gas and oil production to stabilize cash flows, reduce the risk of downward commodity price movements on our sales and to protect the economic assumptions associated with our capital investment programs. Our current hedge position, as further described in our 2004 Annual Report on Form 10-K, includes average hedge prices that are significantly below the current market price for natural gas. During the first quarter of 2005 and through the date of this filing, we have not added any additional hedges.

      Overall, in the first quarter of 2005, we experienced a significant decrease in the fair value of our natural gas hedging derivatives discussed above. The total unrealized loss of these positions at March 31, 2005 was $693 million compared to $516 million at December 31, 2004. These non-cash fair value decreases are generally deferred in our accumulated other comprehensive income and will be realized in our operating results at the time the production volumes to which they relate are sold. The income impact of the settlement of these derivative commodity instruments will be substantially offset by a corresponding change in the value to be received when the hedged natural gas production is sold.

      The following is a reconciliation of EBIT to net income for the quarters ended March 31: