exv99w1

EXHIBIT 99.1

NEWS RELEASE

WESTERN GAS ANNOUNCES
FOURTH-QUARTER AND FULL-YEAR 2008 RESULTS

Provides Capital program and Outlook for 2009

HOUSTON, March 10, 2009 — Western Gas Partners, LP (NYSE: WES) today announced fourth-quarter and full-year financial and operating results for 2008. The announced results include the full-year effect of the Partnership’s acquisition of Powder River assets from Anadarko Petroleum Corporation (NYSE: APC), which closed in December 2008. In addition, the Partnership today announced its 2009 capital program and outlook for the year.

Net income available to limited partners⁽¹⁾ for 2008 totaled $41.3 million, or $0.77 per limited partner unit (diluted), with full-year 2008 Adjusted EBITDA of $112.5 million and full-year distributable cash flow of $105.2 million.⁽²⁾

Net income available to limited partners for the fourth quarter of 2008 totaled $16.1 million, or $0.30 per limited partner unit (diluted). The Partnership’s fourth-quarter Adjusted EBITDA was $27.4 million and distributable cash flow was $24.5 million, resulting in a coverage ratio of 1.44 times for the period. Adjusting these results to exclude the effects of the acquisitions and associated transaction costs, fourth-quarter Adjusted EBITDA and distributable cash flow would have been approximately $21.6 million and $19.1 million, respectively, which would have resulted in a coverage ratio of 1.18 times for the period.

“Western Gas achieved significant milestones during the year, completing our initial public offering and closing our first asset acquisition,” said Western Gas Partners’ President and Chief Executive Officer Robert Gwin. “Our business model is predominantly fee-based and minimizes direct exposure to commodity prices. This strategy, combined with the low capital intensity of our assets and our ability to manage operating costs, enabled us to deliver results consistent with expectations in a challenging market environment.”

Total throughput volumes for the quarter were 1,074 MMcf/d, an increase of approximately 2 percent over the fourth quarter of 2007.


¹		Excludes the results prior to the IPO and the results of the Powder River acquisitions prior to closing.

²		Please see the tables at the end of this release for a reconciliation of GAAP to non-GAAP measures.

Capital expenditures totaled approximately $12.8 million during the fourth quarter of 2008. Of this amount, maintenance capital expenditures were approximately $6.9 million. For the full-year 2008, the Partnership’s capital expenditures totaled $36.9 million, which included maintenance capital of $17.6 million, or 16 percent of Adjusted EBITDA, below the initial forecast of 30 percent of Adjusted EBITDA.

2009 CAPITAL PROGRAM AND OUTLOOK

The board of directors of the Partnership’s general partner has approved a 2009 capital budget of $31 million.

The Partnership’s 2009 performance will be driven primarily by system throughput, as its operations have minimal direct exposure to commodity prices. System throughput will be impacted by our customers’ successful drilling activity in the Partnership’s areas of operation, and the resulting volume of new production connected to our systems to offset natural field decline. Based on current expectations for drilling and completion activity, Adjusted EBITDA for 2009 is expected to be between $90 and $110 million. Total capital expenditures are expected to be between $27 and $31 million with maintenance capital expenditures expected to be between 15 percent and 20 percent of Adjusted EBITDA.

CONFERENCE CALL TOMORROW AT 9 A.M. CDT

The Partnership will host a conference call on March 11 at 9 a.m. Central Daylight Time (10 a.m. Eastern Daylight Time) to discuss fourth-quarter and year-end results and the outlook for 2009. The dial-in number is 1.888.680.0879 and the participant code is 52005646. For complete instructions on how to participate in the conference call, or to access the live audio webcast and slide presentation, please visit www.westerngas.com. A replay of the call will also be available on the Web site for approximately two weeks following the conference call.

Western Gas Partners, LP is a growth-oriented Delaware limited partnership formed by Anadarko Petroleum Corporation (NYSE: APC) to own, operate, acquire and develop midstream energy assets. With midstream assets in East and West Texas, the Rocky Mountains and the Mid-Continent, the Partnership is engaged in the business of gathering, compressing, processing, treating and transporting natural gas for Anadarko and other producers and customers. For more information about Western Gas Partners, please visit www.westerngas.com.

- 2 -

This news release contains forward-looking statements within the meaning of Section 27A of the Securities Act of 1933 and Section 21E of the Securities Exchange Act of 1934. Western Gas Partners believes that its expectations are based on reasonable assumptions. No assurance, however, can be given that such expectations will prove to have been correct. A number of factors could cause actual results to differ materially from the projections, anticipated results or other expectations expressed in this news release. These factors include the ability to meet financial guidance or distribution growth expectations; the ability to obtain new sources of natural gas supplies; the effect of fluctuations in commodity prices and the demand for natural gas and related products; and construction costs or capital expenditures exceeding estimated or budgeted costs or expenditures, as well as other factors described in the “Risk Factors” section of the Form S-1 registration statement filed with the Securities and Exchange Commission and other public filings and press releases by Western Gas Partners. Western Gas Partners undertakes no obligation to publicly update or revise any forward-looking statements.

# # #

Western Gas Partners, LP Contact

Chris Campbell, CFA, chris.campbell@westerngas.com, 832.636.6012

- 3 -

Reconciliation of GAAP to Non-GAAP Measures

Below are reconciliations of Distributable Cash Flow and Adjusted EBITDA (non-GAAP) to Net Income (GAAP), as required under Regulation G of the Securities Exchange Act of 1934. Management believes that the presentation of Distributable Cash Flow and Adjusted EBITDA provides information useful in assessing the Partnership’s financial condition and results of operations and that Distributable Cash Flow and Adjusted EBITDA are widely accepted financial indicators of a company’s ability to incur and service debt, fund capital expenditures and make distributions. Distributable Cash Flow and Adjusted EBITDA, as defined by the Partnership, may not be comparable to similarly titled measures used by other companies. Therefore, the Partnership’s consolidated Distributable Cash Flow and Adjusted EBITDA should be considered in conjunction with net income and other performance measures, such as operating income or cash flow from operating activities.

Distributable Cash Flow

The Partnership defines Distributable Cash Flow as Adjusted EBITDA, plus interest income, less net cash paid for interest expense, maintenance capital expenditures and income taxes.


	Quarter		Year
	Ended		Ended
	December 31,		December 31,
	2008		2008
	(in thousands)
Reconciliation of Net Income to Distributable Cash Flow and Distributable Cash Flow Attributable to Initial Assets
Net income	$	20,113	$	65,276
Add:
Distributions from equity investee		1,455		5,128
Interest expense, net — affiliate (non-cash settled)		—		1,147
Income tax expense		2,654		13,777
Depreciation and impairment		8,395		42,365
Less:
Equity income, net		896		4,736
Cash paid for maintenance capital expenditures		6,908		17,624
Interest income, net — affiliate (non-cash settled)		324		—
Other income		21		145

Distributable Cash Flow	$	24,468	$	105,188

Less: Distributable cash flow attributable to Powder River acquisition		6,796
Add: Transaction costs		1,455

Distributable cash flow attributable to initial assets⁽¹⁾	$	19,127


⁽¹⁾		Initial assets refers to assets contributed to the Partnership in connection with its initial public offering and consists of Anadarko Gathering Company LLC, Pinnacle Gas Treating LLC and MIGC LLC.

- 4 -

Reconciliation of GAAP to Non-GAAP Measures, continued

Adjusted EBITDA

The Partnership defines Adjusted EBITDA as net income (loss), plus distributions from equity investee and interest expense, income tax expense, and depreciation and impairment, less income from equity investment, interest income, income tax benefit and other income (expense).


	Quarter Ended December 31,				Year Ended December 31,
	2008		2007⁽¹⁾		2008		2007⁽¹⁾
			(in thousands)
Reconciliation of Net Income to Adjusted EBITDA and Adjusted EBITDA attributable to Initial Assets
Net Income	$	20,113	$	11,900	$	65,276	$	36,658
Add:
Distributions from equity investee		1,455		1,348		5,128		1,348
Interest expense, net — affiliates		—		1,645		1,259		7,805
Interest expense from note — affiliate		253		—		253		—
Income tax expense		2,654		5,493		13,777		19,540
Depreciation and impairment		8,395		7,722		42,365		30,481
Other expense		—		15		—		15
Less:
Equity income, net		896		935		4,736		4,017
Interest income, net — affiliates		288		—		—		—
Interest income from note — affiliate		4,224		—		10,703		—
Other income		21		—		145		—

Adjusted EBITDA	$	27,441	$	27,188	$	112,474	$	91,830

Less: Adjusted EBITDA attributable to	$	7,309
Powder River acquisition
Add: Transaction costs		1,455

Adjusted EBITDA attributable to initial assets⁽²⁾	$	21,587


⁽¹⁾		Financial information for 2007 has been revised to include results attributable to the Powder River acquisition.

⁽²⁾		Initial assets refers to assets contributed to the Partnership in connection with its initial public offering and consists of Anadarko Gathering Company LLC, Pinnacle Gas Treating LLC and MIGC LLC.

- 5 -

Western Gas Partners, LP
CONDENSED CONSOLIDATED STATEMENTS OF INCOME


	Quarter Ended					Year Ended
	December 31,					December 31,
	2008		2007⁽¹⁾			2008		2007⁽¹⁾
	(in thousands, except per-unit amounts)
Revenues
Gathering, processing and transportation of natural gas	$	30,379	$	27,713		$	123,540	$	104,026
Natural gas, natural gas liquids and condensate sales		23,034		40,940			170,891		148,923
Equity income and other		3,999		1,811			17,217		8,544

Total Revenues	$	57,412	$	70,464		$	311,648	$	261,493

Operating Expenses
Cost of product	$	14,479	$	26,904		$	134,715	$	112,283
Operation and maintenance		9,525		12,718			44,765		40,756
General and administrative		5,541		2,557			14,385		8,364
Property and other taxes		985		1,510			5,701		5,591
Depreciation		8,395		7,722			33,011		30,481
Impairment		—		—			9,354		—

Total Operating Expenses	$	38,925	$	51,411		$	241,931	$	197,475

Operating Income	$	18,487	$	19,053		$	69,717	$	64,018

Interest income (expense), net — affiliates		4,259		(1,645	)		9,191		(7,805	)
Other income (expense)		21		(15	)		145		(15	)

Income Before Income Taxes	$	22,767	$	17,393		$	79,053	$	56,198

Income Tax Expense		2,654		5,493			13,777		19,540

Net Income	$	20,113	$	11,900		$	65,276	$	36,658


Calculation of Limited Partner Interest in Net Income:

Net income	$	20,113		n/a		$	65,276		n/a
Less predecessor interest in net income		3,655		n/a			23,173		n/a
Less general partner interest in net income		329		n/a			842		n/a

Limited partner interest in net income	$	16,129		n/a		$	41,261		n/a
Net income per limited partner unit — basic	$	0.30		n/a		$	0.78		n/a
Net income per limited partner unit — diluted	$	0.30		n/a		$	0.77		n/a
Limited partner units outstanding — basic		53,434		n/a			53,216		n/a
Limited partner units outstanding — diluted		53,464		n/a			53,246		n/a


⁽¹⁾		Financial information for 2007 has been revised to include results attributable to the Powder River acquisition.

- 6 -

Western Gas Partners, LP
CONDENSED CONSOLIDATED BALANCE SHEETS


	December 31,		December 31,
	2008		2007⁽¹⁾
	(in thousands)
Cash and cash equivalents	$	33,306	$	—
Other current assets		12,073		9,658
Note receivable — Anadarko		260,000		—
Net property, plant and equipment		517,815		511,775
Goodwill		14,436		12,347
Equity investment		18,183		10,511
Other assets		628		27

Total Assets	$	856,441	$	544,318


Accounts payable	$	5,544	$	3,737
Other current liabilities		10,797		8,640
Note payable — Anadarko		175,000		—
Other long-term liabilities		10,146		139,801

Total Liabilities	$	201,487	$	152,178


Common unit partner capital (29,093 units issued and outstanding at December 31, 2008)	$	368,049	$	—
Subordinated unit partner capital (26,536 units issued and outstanding at December 31, 2008)		275,917		—
General partner capital (1,135 units issued and outstanding at December 31, 2008)		10,988		—
Parent net investment		—		392,140

Total Partners’ Capital and Parent Net Investment	$	654,954	$	392,140

Total Liabilities, Partners’ Capital and Parent Net Investment	$	856,441	$	544,318


⁽¹⁾		Financial information as of December 31, 2007 has been revised to include assets, liabilities and parent net equity attributable to the Powder River acquisition.

- 7 -

Western Gas Partners, LP
CONDENSED CONSOLIDATED STATEMENTS OF CASH FLOWS


	Year Ended December 31,
	2008			2007⁽¹⁾
	(in thousands)
Cash Flows from Operating Activities
Net income	$	65,276		$	36,658
Adjustments to reconcile net income to net cash provided by operating activities:
Depreciation and impairment		42,365			30,481
Deferred income taxes		1,624			10,816
Changes in assets and liabilities:
(Increase) in accounts receivable		(4,047	)		(3,466	)
(Increase) in natural gas imbalance receivable		(912	)		(226	)
Increase (decrease) in accounts payable and accrued expenses		4,840			142
Increase (decrease) in other items, net		650			(1,497	)

Net cash provided by operating activities	$	109,796		$	72,908

Cash Flows from Investing Activities
Capital expenditures	$	(36,864	)	$	(54,328	)
Acquisition of Powder River Basin operations		(175,000	)		—
Investment in equity — affiliate		(8,095	)		—
Loan to Anadarko		(260,000	)		—

Net cash used in investing activities	$	(479,959	)	$	(54,328	)


Cash Flows from Financing Activities
Proceeds from issuance of common units	$	315,161		$	—
Issuance of note payable to Anadarko		175,000			—
Reimbursement of capital expenditures to parent		(45,161	)		—
Distributions to unitholders		(24,814	)		—
Net advance to parent		(16,717	)		(19,038	)

Net cash provided by (used in) financing activities	$	403,469		$	(19,038	)


Net Increase (Decrease) in Cash and Cash Equivalents		33,306			(458	)
Cash and Cash Equivalents at Beginning of Period		—			458

Cash and Cash Equivalents at End of Period	$	33,306		$	—


⁽¹⁾		Financial information for 2007 has been revised to include results attributable to the Powder River acquisition.

- 8 -

Western Gas Partners, LP
Operating Statistics


	Quarter Ended				Year Ended
	December 31,				December 31,
	2008		2007⁽¹⁾		2008		2007⁽¹⁾

Throughput volumes (MMcf/d)
Gathering and transportation		923		946		966		1,007
Processing		30		29		30		30

Reported throughput		953		975		996		1,037
Equity investment⁽²⁾		121		82		112		84

Total throughput		1,074		1,057		1,108		1,121

Average gross margin per Mcf⁽³⁾	$	0.44	$	0.47	$	0.44	$	0.37


⁽¹⁾		Operating statistics for 2007 have been revised to include results attributable to the Powder River acquisition.

⁽²⁾		Represents the Partnership’s proportionate share of volumes attributable to its 14.81% interest in Fort Union.

⁽³⁾		Calculated as gross operating margin (operating revenues less cost of product) divided by reported throughput.

- 9 -