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PXP Announces Fourth Quarter and Full-Year 2005 Results

March 2, 2006

HOUSTON, March 2 /PRNewswire-FirstCall/ — Plains Exploration & Production Company (“PXP” or the “Company”) today announced financial and operating results for the fourth quarter and full-year 2005.

    Highlights of the year include:    *  PXP’s stock price increased 53 percent for the year ended December 31,       2005. Since the Company became independent in December 2002 the stock       price has increased approximately 300 percent through December 31,       2005.     *  Established high impact exploration opportunities in the Deepwater       Gulf of Mexico and the Green River Basin in Wyoming. PXP currently has       interests in more than 40 blocks in the Deepwater Gulf of Mexico with       a discovery recently announced by the operator of the Big Foot       prospect. Approximately four additional prospects will be drilled in       2006. In the Green River Basin, PXP acquired rights with respect to       50,000 net acres in Sublette County, Wyoming. The acreage includes an       existing indicated discovery and PXP expects well permitting to be       completed and drilling to commence in 2007.     *  Focused the development and exploitation portfolio by acquiring       producing properties in the Los Angeles Basin and acquiring an       additional 16.7 percent interest in the offshore California Point       Arguello Unit while selling our interests in non-core, mostly non-       operated producing properties located in East Texas.     *  Significantly improved PXP’s financial outlook by terminating 2006 oil       price swaps and collars, acquiring substantial oil price downside       protection via put option contracts and improving our oil price       realizations by negotiating lower contractual price differentials on       most of our crude oil production.     *  Created a venture with Cook Hill Properties of Los Angeles to advance       the development and monetization of our real estate surface holdings       in California.     *  Established a $500 million stock repurchase program that is intended       to return excess capital to our investors and generate shareholder       value.    FOURTH QUARTER 2005  

For the quarter PXP reported production of 62.9 thousand barrels of oil equivalent per day (BOEPD) compared to 76.9 BOEPD for 2004. Production was lower year-over-year due to asset sales late in the fourth quarter 2004 and in the second quarter 2005 as well as to previously announced hurricane downtime and operational shut-ins.

For the quarter PXP reported a net income of $73.8 million, or $0.93 per diluted share, compared to a net income of $27.5 million, or $0.35 per diluted share, for the fourth quarter 2004. The results for the fourth quarter 2005 reflect the following items:

    *  $6.9 million pre-tax loss on market-to-market derivative contracts;       cash payments related to the mark-to-market derivative contracts that       settled during the quarter totaled $90.7 million;     *  $23.7 million pre-tax non cash charge to revenue related to certain       oil and gas hedges; and     *  $0.5 million pre-tax credit related to stock-based compensation.   

Without the effects of these items net income for the fourth quarter would have been $33.9 million, or $0.43 per diluted share compared to $18.3 million, or $0.24 per diluted share for 2004. See the end of this release for an explanation and reconciliation of non-GAAP financial measures.

Operating cash flow, a non-GAAP measure, was $96.0 million in the fourth quarter of 2005 compared to 2004 fourth quarter operating cash flow of $72.7 million.

The average realized sales price per BOE before hedging and derivative transactions was $51.71 during the fourth quarter of 2005 compared to $39.55 in the fourth quarter of 2004. Cash payments related to hedging and derivative transactions that settled during the quarter were $16.12 per BOE in 2005 compared to $15.25 in 2004.

Total production costs were $13.54 per BOE in the fourth quarter of 2005, compared to $9.33 per BOE in 2004. The year-over-year increase per unit is primarily attributable to higher steam gas costs, higher than expected lease operating costs due to workover activity and lower volumes associated with hurricane downtime and operational shut-ins.

Total oil and gas depreciation, depletion and amortization costs were $8.40 per BOE in the fourth quarter of 2005, compared to guidance of $7.00 per BOE and $6.99 per BOE in the fourth quarter of 2004. The fourth quarter 2005 includes an $8.7 million pre-tax charge to reflect the year-end depreciation rate increase to $8.40 per BOE from $6.89 per BOE in the third quarter of 2005.

General and administrative costs for the quarter, excluding stock-based compensation, were $14.4 million. The Company recorded a pre-tax credit of $4.2 million for SARs and a $3.8 million pre-tax charge related to vesting of restricted stock and restricted stock units. Cash payments for SARs exercised during the fourth quarter were approximately $9.1 million.

FULL YEAR 2005

For 2005 PXP reported production of 64.6 thousand BOEPD compared to 62.5 BOEPD in 2004. Operating cash flow, a non-GAAP measure, was $343.9 million in 2005 compared to $223.2 million in the prior year period.

Due primarily to a mark-to-market charge for derivative fair value losses associated with the rise in oil prices during the year, PXP reported a net loss of $211.0 million, or $2.71 per diluted share as compared to net income of $8.8 million, or $0.14 per diluted share, for 2004. During 2005, PXP recognized the following items:

    *  $636.5 million pre-tax loss on mark-to-market derivative contracts.       Cash payments related to the mark-to-market derivative contracts       totaled $425.4 million, including the $145.4 million cash payment to       eliminate the 2006 collars;     *  $82.8 million pre-tax non cash charge to revenue related to certain       oil and gas hedges; and     *  $72.3 million pre-tax charge related to stock-based compensation.   

Without the effects of these items net income for the year would have been $103.6 million, or $1.32 per diluted share compared to $63.9 million, or $1.00 per diluted share for 2004.

The average realized sales price per BOE before hedging and derivative transactions was $45.96 during 2005 compared to $35.92 in 2004. Cash payments related to hedging and derivative transactions that settled during the twelve months were $14.40 per BOE in 2005 compared to $11.24 in 2004.

Total production costs were $12.10 per BOE for the year, compared to $9.76 per BOE in 2004. The year-over-year increase per unit is primarily attributable to higher steam gas costs for the San Joaquin Valley production acquired through the Nuevo merger that was completed in May 2004 and higher lease operating expenses due to workover activity, increased field costs and lost volumes associated with shut-in production from Gulf of Mexico hurricanes.

General and administrative costs for the year, excluding stock-based compensation, were $50.3 million. The Company recognized a pre-tax stock-based compensation charge of $72.3 million during the year related to SARs and restricted stock. The Company recorded a pre-tax charge of $39.9 million for SARs and a $32.4 million pre-tax charge related to vesting of restricted stock and restricted stock units. Cash payments for SARs exercised during the year were approximately $22.5 million.

2005 RESERVES

As determined by its third party independent engineers, PXP’s year-end 2005 proven reserves totaled 401 million barrels of oil equivalent (MMBOE) compared to 419 MMBOE at year-end 2004. The 2005 reserve total includes the effect of divesting 26.2 MMBOE, acquiring 19.3 MMBOE, net negative revisions of 12.4 MMBOE notably related to Deep Inglewood and Rocky Point, drill-bit additions of 24.6 MMBOE and production for the year of 23.6 MMBOE. The Company’s total costs incurred for the year was $580.9 million, of which $129.1 million was exploration capital and $151.4 million was for acquisitions.

Year-end 2005 estimated proved reserves include 356 million barrels of oil and liquids and 268 billion cubic feet of natural gas. Approximately 67 percent of the reserves are classified as proved developed. PXP’s reserve-to- production ratio is about 17 years for total proved reserves.

The following table summarizes PXP’s 2005 and five-year reserve statistics.

                                                2005         2001-2005 (A)     (Million BOE)    Beginning Reserves                          419.3          220.0    Extensions/Discoveries/Improved Recovery     24.6          130.5    Revisions                                   (12.4)         (36.7)    Acquisitions                                 19.3          257.1    Divestitures                                (26.2)         (93.0)    Production                                  (23.6)         (76.9)    Ending Reserves                             401.0          401.0     ($ Million)    Exploration & Development Costs          $  429.5       $  931.5    Acquisition Costs                        $  151.4       $1,880.0    Total Costs Incurred                     $  580.9       $2,811.5    (A)  PXP was spun off from Plains Resources in December 2002.     OPERATIONAL UPDATE  

At PXP’s Rocky Point development offshore California, as a follow on to the successful re-drill of the C-14 well announced in November 2005, PXP and its partners approved and re-drilled the low volume C-13 well as an additional near horizontal side-track well and brought it on to production this February at a gross rate of 2,200 BOEPD. Based on the results of these two side-track near horizontal wells, a new well, the C-15, will be drilled with operations currently underway. With the addition of the C-15 well and including the original C-12 development well, the total Rocky Point well count will be four, all from the same platform. PXP’s working interest at Point Arguello and Rocky Point is approximately 69.3 percent. Further Rocky Point drilling beyond the new C-15 well is not presently anticipated; however, opportunities for additional drilling in the main Point Arguello Field are under review.

Also offshore California at the Point Pedernales Field, rig refurbishment activities were completed in January and the first of four planned in-fill wells has been drilled to its planned total depth. Completion and initial production are expected later this month. Drilling operations at Point Pedernales will not necessarily be sequential as workovers of existing wells will also be conducted with the available platform rig. PXP has a 100 percent working interest at Point Pedernales.

In California’s Los Angeles Basin, 38 wells have been completed in the fourth quarter and thus far in 2006. Drilling activities during this period have been concentrated in the Inglewood Field in the Vickers-Rindge waterflood zone, the Moynier formation with a newly initiated waterflood, and to a lesser extent in the Sentous Sand primary recovery zone. Drilling will continue in Inglewood in the Vickers-Rindge and in expanding the successful Moynier development. Additionally a pay interval called the Rubel located between the Vickers-Rindge and Moynier will be drilled, pilot waterflooded, and evaluated this year. PXP has a 100 percent working interest and 80-85 percent income interest in Inglewood. Additional drilling in the Los Angeles Basin in the Las Cienegas Field which was acquired last year should begin this summer.

In the San Joaquin Valley (SJV), 101 wells have been drilled in the fourth quarter and thus far in 2006. In the Midway Sunset Field, 24 producers were completed, and 11 more producers are in the completion/steaming process and have not yet started production. At the Mt. Poso Field, which produces lighter oil without the need for steaming, 4 new wells were completed with another 12 wells being completed or recovering completion fluids. In the Cymric Field, 9 producers were completed with another 5 producers not yet producing and 8 new steam injection wells were drilled. The remaining new wells included stratigraphic tests to define field expansion possibilities, steam temperature observation wells, and drilling in other SJV fields. Total new drilling in the San Joaquin Valley should total slightly over 200 wells in 2006. In addition to drilling activities, considerable facilities construction or expansion is underway to support both new and increased production and steam volumes in Midway Sunset, Cymric, Belridge, and McKittrick Fields. PXP generally has a 100 percent working interest and 80-100 percent income interest in the above listed San Joaquin Valley fields.

In the south Louisiana portion of PXP’s Eastern Development Unit, success continued at the Queen Bess Isle Field in Jefferson Parish with the third of three PXP drilled wells finding pay. The well was completed as a single zone completion with additional up hole pay available for a future completion. The well was brought on to sales in February at a rate of 7.5 MMCFD. PXP has a 50 percent working interest and approximate 42.7 percent income interest in Queen Bess #3. Three Breton Sound wells are anticipated in 2006 with one completion each in the second, third, and fourth quarters.

In the Texas portion of the Eastern Development Unit, PXP completed a horizontal Wolfcamp formation test in the Pakenham Field which is currently flowing to sales at a rate of 1.2 MMCFD. This is the field’s first horizontal well in the Wolfcamp which is the primary producing zone at Pakenham. PXP has a 100 percent working interest and 75 percent income interest in the well. Also in Texas during 2005, PXP assembled acreage over several specific Ellenburger Formation exploratory prospects in West Texas and several more Pettit Formation prospects in East Texas. Net acreage totals exceed 32,000 acres with additional acreage acquisition possible. Both zones will be evaluated initially with vertical pilot holes and if pay is indicated the resources will be exploited with horizontal wells. Initial test wells on both an Ellenburger and Pettit prospect are currently drilling. If successful, gas production is expected at rates between 2 and 6 MMCFD per well. PXP will have a 75-100 percent working interest in most of the Ellenburger and Pettit acreage.

In the deep water Middle/Lower Miocene trend area of the Gulf of Mexico, PXP owns a 12.5 percent working interest in the Big Foot prospect announced by the operator earlier this year as a successful well with as much as 300 feet or more of net oil pay. Appraisal operations at Big Foot are underway. PXP is also currently participating in drilling the Caesar Prospect with a 17.5 percent working interest. Two additional deep water Miocene exploratory tests are also anticipated later in 2006. PXP’s deepwater Miocene prospect inventory now totals 13 prospects on over 40 blocks with interests averaging about 15 percent.

2006 OUTLOOK

PXP plans to issue updated annual guidance for 2006 via Form 8-K to reflect an increase in the depreciation, depletion and amortization rate to a range of $8.40 to $8.50 per BOE. PXP reaffirms all other 2006 estimates originally filed on December 6, 2005.

FOURTH QUARTER AND FULL-YEAR EARNINGS CONFERENCE CALL

PXP will host a conference call tomorrow March 3, 2006 at 8:30 a.m. Central to discuss the results and other forward-looking items. Investors wishing to participate may dial 1-800-370-0740 or 1-973-409-9259. The replay will be available through March 17, 2006 and can be accessed by dialing 1-877-519-4471 or 1-973-341-3080, Replay ID: 6936123.

ADDITIONAL INFORMATION & FORWARD LOOKING STATEMENTS

This press release contains forward-looking information regarding PXP that is intended to be covered by the safe harbor “forward-looking statements” provided by the Private Securities Litigation Reform Act of 1995. All statements included in this press release that address activities, events or developments that PXP expects, believes or anticipates will or may occur in the future are forward-looking statements. These include statements regarding:

    * reserve and production estimates,    * oil and gas prices,    * the impact of derivative positions,    * production expense estimates,    * cash flow estimates,    * future financial performance,    * planned capital expenditures, and    * other matters that are discussed in PXP’s filings with the SEC.   

These statements are based on our current expectations and projections about future events and involve known and unknown risks, uncertainties, and other factors that may cause our actual results and performance to be materially different from any future results or performance expressed or implied by these forward-looking statements. Please refer to our filings with the SEC, including our Form 10-K for the year ended December 31, 2004, for a discussion of these risks.

All forward-looking statements in this report are made as of the date hereof, and you should not place undue reliance on these statements without also considering the risks and uncertainties associated with these statements and our business that are discussed in this report. Moreover, although we believe the expectations reflected in the forward-looking statements are based upon reasonable assumptions, we can give no assurance that we will attain these expectations or that any deviations will not be material. Except for any obligation to disclose material information under the Federal securities laws, we do not intend to update these forward-looking statements and information.

PXP is an independent oil and gas company primarily engaged in the upstream activities of acquiring, exploiting, developing and producing oil and gas in its core areas of operation: onshore and offshore California, West Texas and the Gulf Coast region of the United States. PXP is headquartered in Houston, Texas.

    Plains Exploration & Production Company    Consolidated Statements of Income    (amounts in thousands, except per share data)                                        Quarter Ended         Year Ended                                        December 31,         December 31,                                        2005     2004       2005      2004(A)   Revenues     Oil sales                       $218,900  $150,554   $734,032  $448,056     Gas sales                         54,128    64,371    206,736   221,360     Other operating revenues           1,390       689      3,652     2,290                                      274,418   215,614    944,420   671,706   Costs and Expenses     Production costs       Lease operating expenses        35,106    30,474    140,595   122,540       Steam gas costs                 27,260    17,901     78,277    40,521       Electricity                      8,139     8,417     31,817    30,137       Production and ad valorem taxes  6,064     7,214     24,478    22,332       Gathering and transportation        expenses                        1,709     1,983     10,125     7,550     General and administrative       G&A excluding items below       14,445    11,123     50,321    35,394       Stock appreciation rights       (4,245)    7,015     39,856    35,464       Other stock-based        compensation                    3,792     1,447     32,449     8,092       Merger related costs               —     2,772        —     6,247     Provision for legal and      regulatory settlements              —     6,845        —     6,845     Depletion, depreciation,      amortization and accretion       52,346    53,743    187,915   147,985                                      144,616   148,934    595,833   463,107   Income from Operations             129,802    66,680    348,587   208,599   Other Income (Expense)     Gain (loss) on mark-to-market      derivative contracts             (6,904)  (24,472)  (636,473) (150,314)     Debt extinguishment costs            —       —        —   (19,691)     Interest expense                 (15,382)  (10,788)   (55,421)  (37,294)     Interest and other income          3,544        54      3,324       723   Income (Loss) Before Income Taxes  111,060    31,474   (339,983)    2,023     Income tax (expense) benefit       Current                            802       232        229      (375)       Deferred                       (38,074)   (4,179)   128,745     7,192   Net Income (Loss)                  $73,788   $27,527  $(211,009)   $8,840    Earnings per Share     Basic                              $0.94     $0.36     $(2.71)    $0.14     Diluted                            $0.93     $0.35     $(2.71)    $0.14   Weighted Average Shares    Outstanding     Basic                             78,305    77,043     77,726    63,542     Diluted                           78,997    77,824     77,726    64,014     (A) Reflects the acquisition of Nuevo Energy Company effective        May 14, 2004.       Plains Exploration & Production Company    Operating Data                                            Quarter Ended      Year Ended                                            December 31,      December 31,                                           2005     2004     2005     2004(A)   Sales Volumes      Oil and Liquids (MBbls)             4,880     5,267   18,671    16,441      Gas (MMcf)                          5,446    10,859   29,359    38,590      MBOE                                5,787     7,076   23,564    22,872    Average Daily Sales Volumes      Oil and Liquids (Bbls)             53,038    57,246   51,154    44,920      Gas (Mcf)                          59,195   118,027   80,435   105,436      BOE                                62,904    76,917   64,560    62,493    Unit Economics (in dollars)      Average NYMEX Prices        Oil                              $60.03    $48.27   $56.61    $41.43        Gas                               12.97      7.11     8.62      6.14       Average Realized Sales Price       Before Derivative Transactions        Oil (per Bbl)                    $49.80    $40.19   $46.76    $36.12        Gas (per Mcf)                     10.32      6.29     7.15      5.90        Per BOE                           51.71     39.55    45.96     35.92       Production expenses per BOE        Lease operating expenses          $6.07     $4.31    $5.97     $5.36        Steam gas costs                    4.71      2.53     3.32      1.77        Electricity                        1.41      1.19     1.35      1.32        Production and ad valorem taxes    1.05      1.02     1.03      0.98        Gathering and transportation         expenses                          0.30      0.28     0.43      0.33     Cash payments related to 2005 and    2004 derivative contracts that settled    during the periods were as follows    ($/millions):        Contracts accounted for using         hedge accounting          Oil                              $—     $84.6    $53.0    $207.4          Gas                               2.6       7.4      6.3      17.5        Mark-to-market contracts           90.7      15.9    280.0      32.2     (A)  Reflects the acquisition of Nuevo Energy Company effective         May 14, 2004.                       PLAINS EXPLORATION & PRODUCTION COMPANY                          CONSOLIDATED BALANCE SHEETS                           (in thousands of dollars)                                                         December 31,                                                    2005              2004                     ASSETS   Current Assets    Cash and cash equivalents                      $1,552            $1,545    Accounts receivable                           148,691           122,288    Inventories                                    10,325             8,505    Deferred income taxes                         128,816            76,823    Assets held for sale                              —            44,222    Other current assets                            3,948             4,784                                                  293,332           258,167   Property and Equipment, at cost    Oil and natural gas properties –     full cost method                           2,717,096         2,481,584    Other property and equipment                   16,282            12,546                                                2,733,378         2,494,130    Less allowance for depreciation,     depletion and amortization                  (498,075)         (323,041)                                                2,235,303         2,171,089   Goodwill                                       173,858           170,467   Other Assets                                    39,449            33,522                                               $2,741,942        $2,633,245         LIABILITIES AND STOCKHOLDERS’ EQUITY   Current Liabilities    Accounts payable                             $122,996           $90,469    Commodity derivative contracts                 85,596           175,473    Royalties payable                              43,279            39,174    Stock appreciation rights                      55,170            34,589    Interest payable                               13,000            13,070    Deposit on assets held for sale                   —            40,711    Other current liabilities                      43,957            32,909                                                  363,998           426,395   Long-Term Debt    8.75% Senior Subordinated Notes               276,538           276,727    7.125% Senior Notes                           248,837           248,741    Revolving credit facility                     272,000           110,000                                                  797,375           635,468   Other Long-Term Liabilities    Asset retirement obligation                   155,865           126,850    Commodity derivative contracts                440,543           244,140    Other                                           7,014            10,534                                                  603,422           381,524   Deferred Income Taxes                          260,694           319,483   Stockholders’ Equity    Common stock                                      784               772    Additional paid-in capital                    936,101           913,466    Retained earnings (deficit)                  (130,661)           80,406    Accumulated other comprehensive income        (89,566)         (123,874)    Treasury stock, at cost                          (205)             (395)                                                  716,453           870,375                                               $2,741,942        $2,633,245       Plains Exploration & Production Company    Consolidated Statements of Cash Flows    (thousands of  dollars)                                         Quarter Ended         Year Ended                                         December 31,        December 31,                                        2005      2004      2005       2004   CASH FLOWS FROM OPERATING ACTIVITIES   Net income (loss)                  $73,788   $27,527  $(211,009)   $8,840   Items not affecting cash flows    from operating activities     Depreciation, depletion,      amortization and accretion       52,346    53,743    187,915   147,985     Deferred income taxes             38,074     4,179   (128,745)   (7,192)     Debt extinguishment costs            —       —        —    (4,453)     Commodity derivative contracts       Loss (gain) on derivatives     (58,686)  (16,365)   300,152    49,841       Reclassify financing        derivative settlements         94,518    42,247    459,450   103,521     Noncash compensation       Stock appreciation rights      (13,375)    2,384     17,354    20,268       Other noncash compensation       3,952     1,447     33,030     8,092     Other noncash items                  (24)      (52)       (93)     (144)   Changes in assets and liabilities    from operating activities         (15,434)   (2,060)  (194,720)   36,461   Net cash provided by operating    activities                        175,159   113,050    463,334   363,219    CASH FLOWS FROM INVESTING ACTIVITIES   Acquisition, exploration,    development and other costs      (115,749)  (69,288)  (509,127) (211,387)   Acquisition of Nuevo Energy Company    —       —        —   (14,156)   Proceeds from property sales         3,354   153,097    346,450   238,989   Other                               (2,220)   (2,293)    (5,743)   (8,032)   Net cash provided by (used in)    investing activities             (114,615)   81,516   (168,420)    5,414    CASH FLOWS FROM FINANCING ACTIVITIES   Change in revolving credit    facilities                         33,500  (153,000)   162,000  (101,000)   Proceeds from debt issuance            —       —        —   248,695   Retirement of debt assumed in    acquisition of Nuevo Energy Company   —       —        —  (405,000)   Derivative settlements             (94,518)  (42,247)  (459,450) (103,521)   Other                                  720       436      2,543    (7,639)   Net cash provided by (used in)    financing activities              (60,298) (194,811)  (294,907) (368,465)    Net increase (decrease) in cash    and cash equivalents                  246      (245)         7       168   Cash and cash equivalents,    beginning of period                 1,306     1,790      1,545     1,377   Cash and cash equivalents, end of    period                             $1,552    $1,545     $1,552    $1,545       Plains Exploration & Production Company    Summary of Open Derivative Positions    at December 31, 2005                 Instrument      Daily              Average      Period       Type        Volumes              Price              Index     Sales of Crude Oil Production     2006    Jan – Dec   Put options  50,000/Bbls     $55.00 Strike price        WTI     2007    Jan – Dec   Collar       22,000/Bbls  $25.00 Floor – $34.76 Ceiling WTI    Jan – Dec   Put options  50,000/Bbls     $55.00 Strike price        WTI     2008    Jan – Dec   Collar       22,000/Bbls  $25.00 Floor – $34.76 Ceiling WTI     Purchases of Natural Gas     2006    Jan – Dec   Call options 30,000/MMBtu    $12.00 Strike price       Socal      Plains Exploration & Production Company    Reconciliation of GAAP to Non-GAAP Measures   

The following chart reconciles Net Cash Provided by Operating Activities (GAAP) to Operating Cash Flow (non-GAAP) for the three-month and the twelve- month periods ended December 31. Management believes this presentation may be useful to investors because it is illustrative of the impact of the Company’s derivative contracts. PXP management uses this information for comparative purposes within the industry and as a means of measuring the Company’s ability to fund capital expenditures and service debt. This measure is not intended to replace the GAAP statistic but to provide additional information that may be helpful in evaluating the Company’s operational trends and performance.

Operating cash flow is calculated by adjusting the GAAP measure of cash provided by operating activities to exclude changes in assets and liabilities and include derivative cash flows that are classified as a financing activity in the statement of cash flows. Pursuant to SFAS 149 “Amendment of SFAS 133, Derivative Instruments and Hedging Activities”, certain of our derivative instruments are deemed to contain a significant financing element and cash flows associated with these positions are required to be reflected as financing activities. The cash flows that were reclassified in the tables below reflect settlements for 2005 and 2004 positions and do not include the $145.4 million that we paid in the second quarter of 2005 to eliminate our 2006 collar positions.

                                            Quarter Ended      Year Ended                                             December 31,      December 31,                                            2005     2004     2005     2004                                                (millions of dollars)    Net cash provided by operating    activities (GAAP)                      $175.1   $113.0   $463.3   $363.2     Changes in operating assets and      liabilities       Commodity derivative contracts         3.7     (4.1)   139.0    (19.7)       Other                                 11.8      6.0     55.7    (16.8)     Cash payments for commodity derivative      contracts that settled during the       period that are reflected as       financing cash flows in the statement       of cash flows                        (94.6)   (42.2)  (314.1)  (103.5)   Operating cash flow (Non-GAAP)           $96.0    $72.7   $343.9   $223.2                                                          2005                                    1st Qtr  2nd Qtr  3rd Qtr  4th Qtr  Year                                               (millions of dollars)    Net cash provided by operating    activities (GAAP)                $97.8    $15.7   $174.7  $175.1  $463.3     Changes in operating assets      and liabilities       Commodity derivative contracts (3.0)   145.9     (7.6)    3.7   139.0       Other                          34.1     (3.4)    13.2    11.8    55.7     Cash payments for commodity      derivative contracts that      settled during the period that      are reflected as financing      cash flows in the statement      of cash flows                  (50.8)   (74.6)   (94.1)  (94.6) (314.1)   Operating cash flow (Non-GAAP)    $78.1    $83.6    $86.2   $96.0  $343.9      Plains Exploration & Production Company    Reconciliation of GAAP to Non-GAAP Measures   

The following chart reconciles net income (loss) (GAAP) to net income (loss) excluding certain items (Non-GAAP) for the three-month and the twelve- month periods ended December 31. This measure excludes certain items that management believes affect the comparability of operating results. Items excluded are generally items whose timing or amount cannot be reasonably estimated. Management believes this presentation may be helpful to investors who want to isolate the impacts from oil and gas derivative contracts and stock-based compensation. PXP management uses this information to analyze operating trends and for comparative purposes within the industry. This measure is not intended to replace the GAAP statistic but to provide additional information that may be helpful in evaluating the Company’s operational trends and performance.

                                          Quarter Ended      Year Ended                                           December 31,     December 31,                                           2005    2004     2005     2004                                              (millions of dollars)     Net income (loss)  (GAAP)             $73.8   $27.5   $(211.0)   $8.8       Loss on mark-to-market derivative       contracts                            6.9    24.5     636.5   150.3      Cash payments on mark-to-market       derivative contracts               (90.7)  (15.9)   (280.0)  (32.2)      Non cash charge to revenue for oil       and gas hedges                      23.7   (27.0)     82.9   (73.0)      Stock-based compensation             (0.5)    8.5      72.2    43.6      Adjust income taxes                  20.7     0.7    (197.0)  (33.6)     Net income (loss) excluding certain     items (Non-GAAP)                     $33.9   $18.3    $103.6   $63.9    

The cash payment on mark-to-market derivative contracts in the table above reflects settlements for 2005 positions. The 2005 amount does not include the $145.4 million that we paid in the second quarter of 2005 to eliminate our 2006 collar positions.

Plains Exploration & Production Company

CONTACT: Scott D. Winters, Vice President – Investor Relations of PlainsExploration & Production Company, +1-713-579-6190, or +1-800-934-6083

Web site: http://www.plainsxp.com/