10-Q

UNITED STATES

SECURITIES AND EXCHANGE COMMISSION

Washington, D.C. 20549

FORM 10-Q

(Mark One)

þ QUARTERLY REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934

For the quarterly period ended September 30, 2014

Or

o 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: 001-34046

WESTERN GAS PARTNERS, LP

(Exact name of registrant as specified in its charter)

Delaware	26-1075808
(State or other jurisdiction of incorporation or organization)	(I.R.S. Employer Identification No.)
1201 Lake Robbins Drive The Woodlands, Texas	77380
(Address of principal executive offices)	(Zip Code)

(832) 636-6000

(Registrant’s telephone number, including area code)

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 has submitted electronically and posted on its corporate Web site, if any, every Interactive Data File required to be submitted and posted pursuant to Rule 405 of Regulation S-T (§232.405 of this chapter) during the preceding 12 months (or for such shorter period that the registrant was required to submit and post such files).    Yes  þ    No  o

Indicate by check mark whether the registrant is a large accelerated filer, an accelerated filer, a non-accelerated filer, or a smaller reporting company. See the definitions of “large accelerated filer,” “accelerated filer” and “smaller reporting company” in Rule 12b-2 of the Exchange Act.

Large accelerated filer þ	Accelerated filer o	Non-accelerated filer o	Smaller reporting company o
	(Do not check if a smaller reporting company)

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

There were 119,070,104 common units outstanding as of October 27, 2014.

TABLE OF CONTENTS

PART I		FINANCIAL INFORMATION (UNAUDITED)	PAGE
	Item 1.	Financial Statements
		Consolidated Statements of Income for the three and nine months ended September 30, 2014 and 2013	4
		Consolidated Balance Sheets as of September 30, 2014, and December 31, 2013	5
		Consolidated Statement of Equity and Partners’ Capital for the nine months ended September 30, 2014	6
		Consolidated Statements of Cash Flows for the nine months ended September 30, 2014 and 2013	7
		Notes to Consolidated Financial Statements	8
	Item 2.	Management’s Discussion and Analysis of Financial Condition and Results of Operations	22
		Cautionary Note Regarding Forward-Looking Statements	22
		Executive Summary	24
		Acquisitions	25
		Equity Offerings	26
		Results of Operations	27
		Operating Results	27
		Key Performance Metrics	34
		Liquidity and Capital Resources	38
		Contractual Obligations	45
		Off-Balance Sheet Arrangements	45
		Recent Accounting Developments	45
	Item 3.	Quantitative and Qualitative Disclosures About Market Risk	46
	Item 4.	Controls and Procedures	47
PART II		OTHER INFORMATION
	Item 1.	Legal Proceedings	47
	Item 1A.	Risk Factors	48
	Item 2.	Unregistered Sales of Equity Securities and Use of Proceeds	48
	Item 6.	Exhibits	49

2

DEFINITIONS

As generally used within the energy industry and in this quarterly report on Form 10-Q, the identified terms have the following meanings:

Barrel or Bbl: 42 U.S. gallons measured at 60 degrees Fahrenheit.

Btu: British thermal unit; the approximate amount of heat required to raise the temperature of one pound of water by one degree Fahrenheit.

Condensate: A natural gas liquid with a low vapor pressure mainly composed of propane, butane, pentane and heavier hydrocarbon fractions.

Cryogenic: The process in which liquefied gases, such as liquid nitrogen or liquid helium, are used to bring volumes to very low temperatures (below approximately -238 degrees Fahrenheit) to separate natural gas liquids from natural gas. Through cryogenic processing, more natural gas liquids are extracted than when traditional refrigeration methods are used.

Drip condensate: Heavier hydrocarbon liquids that fall out of the natural gas stream and are recovered in the gathering system without processing.

Fractionation: The process of applying various levels of higher pressure and lower temperature to separate a stream of natural gas liquids into ethane, propane, normal butane, isobutane and natural gasoline for end-use sale.

Imbalance: Imbalances result from (i) differences between gas volumes nominated by customers and gas volumes received from those customers and (ii) differences between gas volumes received from customers and gas volumes delivered to those customers.

MBbls/d: One thousand barrels per day.

MMBtu: One million British thermal units.

MMcf/d: One million cubic feet per day.

Natural gas liquid(s) or NGL(s): The combination of ethane, propane, normal butane, isobutane and natural gasolines that, when removed from natural gas, become liquid under various levels of higher pressure and lower temperature.

Residue: The natural gas remaining after being processed or treated.

3

PART I. FINANCIAL INFORMATION

Item 1.Financial Statements

WESTERN GAS PARTNERS, LP

CONSOLIDATED STATEMENTS OF INCOME

(UNAUDITED)

	Three Months Ended   September 30,						Nine Months Ended   September 30,
thousands except per-unit amounts	2014			2013 (1)			2014			2013 (1)
Revenues – affiliates
Gathering, processing and transportation of natural gas and natural gas liquids	$	104,258		$	83,606		$	288,392		$	218,680
Natural gas, natural gas liquids and condensate sales	138,464			129,411			415,715			371,077
Other, net	2,778			108			4,349			1,253
Total revenues – affiliates	245,500			213,125			708,456			591,010
Revenues – third parties
Gathering, processing and transportation of natural gas and natural gas liquids	64,098			47,175			182,663			124,791
Natural gas, natural gas liquids and condensate sales	11,630			11,915			37,471			31,539
Other, net	5,237			1,287			7,276			3,330
Total revenues – third parties	80,965			60,377			227,410			159,660
Total revenues	326,465			273,502			935,866			750,670
Equity income, net (2)	19,063			4,520			41,322			11,944
Operating expenses
Cost of product (3)	108,393			93,516			318,428			270,059
Operation and maintenance (3)	53,657			42,757			145,064			121,165
General and administrative (3)	7,889			7,276			24,304			22,228
Property and other taxes	6,564			6,649			20,718			18,520
Depreciation, amortization and impairments	45,651			37,615			130,009			106,551
Total operating expenses	222,154			187,813			638,523			538,523
Operating income	123,374			90,209			338,665			224,091
Interest income, net – affiliates	4,225			4,225			12,675			12,675
Interest expense	(20,878		)	(13,018		)	(55,703		)	(37,483		)
Other income (expense), net	97			439			788			1,612
Income before income taxes	106,818			81,855			296,425			200,895
Income tax (benefit) expense	278			(27		)	276			4,192
Net income	106,540			81,882			296,149			196,703
Net income attributable to noncontrolling interest	3,863			3,376			11,005			7,467
Net income attributable to Western Gas Partners, LP	$	102,677		$	78,506		$	285,144		$	189,236
Limited partners’ interest in net income:
Net income attributable to Western Gas Partners, LP	$	102,677		$	78,506		$	285,144		$	189,236
Pre-acquisition net (income) loss allocated to Anadarko	—			(106		)	956			(4,616		)
General partner interest in net (income) loss (4)	(31,058		)	(18,693		)	(83,939		)	(47,733		)
Limited partners’ interest in net income (4)	71,619			59,707			202,161			136,887
Net income per common unit – basic and diluted	$	0.60		$	0.53		$	1.71		$	1.26
Weighted average common units outstanding – basic and diluted	119,068			112,143			118,326			108,540

⁽¹⁾  Financial information has been recast to include the financial position and results attributable to the TEFR Interests. See Note 1 and Note 2.

⁽²⁾  Income earned from equity investments is classified as affiliate. See Note 1.

⁽³⁾  Cost of product includes product purchases from Anadarko (as defined in Note 1) of $22.7 million and $74.6 million for the three and nine months ended September 30, 2014, respectively, and $33.8 million and $97.8 million for the three and nine months ended September 30, 2013, respectively. Operation and maintenance includes charges from Anadarko of $14.6 million and $42.5 million for the three and nine months ended September 30, 2014, respectively, and $13.5 million and $41.0 million for the three and nine months ended September 30, 2013, respectively. General and administrative includes charges from Anadarko of $6.6 million and $19.9 million for the three and nine months ended September 30, 2014, respectively, and $5.9 million and $17.3 million for the three and nine months ended September 30, 2013, respectively. See Note 5.

⁽⁴⁾  Represents net income earned on and subsequent to the date of acquisition of the Partnership assets (as defined in Note 1). See Note 4.

See accompanying Notes to Consolidated Financial Statements.

4

WESTERN GAS PARTNERS, LP

CONSOLIDATED BALANCE SHEETS

(UNAUDITED)

thousands except number of units	September 30, 2014		December 31, 2013 (1)
ASSETS
Current assets
Cash and cash equivalents	$	67,837	$	100,728
Accounts receivable, net (2)	126,345		84,060
Other current assets (3)	6,773		10,022
Total current assets	200,955		194,810
Note receivable – Anadarko	260,000		260,000
Property, plant and equipment
Cost	4,754,279		4,239,100
Less accumulated depreciation	986,692		855,845
Net property, plant and equipment	3,767,587		3,383,255
Goodwill	105,336		105,336
Other intangible assets	52,561		53,606
Equity investments	639,191		593,400
Other assets	28,910		27,401
Total assets	$	5,054,540	$	4,617,808
LIABILITIES, EQUITY AND PARTNERS’ CAPITAL
Current liabilities
Accounts and natural gas imbalance payables (4)	$	27,011	$	39,589
Accrued ad valorem taxes	21,083		13,860
Income taxes payable	258		—
Accrued liabilities (5)	152,878		137,011
Total current liabilities	201,230		190,460
Long-term debt	2,082,914		1,418,169
Deferred income taxes	780		37,998
Asset retirement obligations and other	85,903		79,145
Total long-term liabilities	2,169,597		1,535,312
Total liabilities	2,370,827		1,725,772
Equity and partners’ capital
Common units (119,070,104 and 117,322,812 units issued and outstanding at September 30, 2014, and December 31, 2013, respectively)	2,524,313		2,431,193
General partner units (2,430,007 and 2,394,345 units issued and outstanding at September 30, 2014, and December 31, 2013, respectively)	89,150		78,157
Net investment by Anadarko	—		312,092
Total partners’ capital	2,613,463		2,821,442
Noncontrolling interest	70,250		70,594
Total equity and partners’ capital	2,683,713		2,892,036
Total liabilities, equity and partners’ capital	$	5,054,540	$	4,617,808

⁽¹⁾  Financial information has been recast to include the financial position and results attributable to the TEFR Interests. See Note 1 and Note 2.

⁽²⁾  Accounts receivable, net includes amounts receivable from affiliates (as defined in Note 1) of $87.3 million and $47.9 million as of September 30, 2014, and December 31, 2013, respectively.

⁽³⁾  Other current assets includes natural gas imbalance receivables from affiliates of $0.1 million as of September 30, 2014, and December 31, 2013.

⁽⁴⁾  Accounts and natural gas imbalance payables includes amounts payable to affiliates of $0.1 million and $2.3 million as of September 30, 2014, and December 31, 2013, respectively.

⁽⁵⁾  Accrued liabilities includes amounts payable to affiliates of zero and $0.1 million as of September 30, 2014, and December 31, 2013, respectively.

See accompanying Notes to Consolidated Financial Statements.

5

WESTERN GAS PARTNERS, LP

CONSOLIDATED STATEMENT OF EQUITY AND PARTNERS’ CAPITAL

(UNAUDITED)

	Partners’ Capital
thousands	Net Investment by Anadarko			Common Units			General Partner  Units			Noncontrolling Interest			Total
Balance at December 31, 2013 (1)	$	312,092		$	2,431,193		$	78,157		$	70,594		$	2,892,036
Net income (loss)	(956		)	202,161			83,939			11,005			296,149
Issuance of common and general partner units, net of offering expenses	—			99,274			2,467			—			101,741
Distributions to noncontrolling interest owner	—			—			—			(11,349		)	(11,349		)
Distributions to unitholders	—			(221,677		)	(75,336		)	—			(297,013		)
Acquisitions from affiliates	(372,784		)	16,534			—			—			(356,250		)
Contributions of equity-based compensation from Anadarko	—			2,471			50			—			2,521
Net pre-acquisition contributions from Anadarko (2)	23,488			—			—			—			23,488
Net distributions to Anadarko of other assets	—			(6,271		)	(127		)	—			(6,398		)
Elimination of net deferred tax liabilities	38,160			—			—			—			38,160
Other	—			628			—			—			628
Balance at September 30, 2014	$	—		$	2,524,313		$	89,150		$	70,250		$	2,683,713

⁽¹⁾  Financial information has been recast to include the financial position and results attributable to the TEFR Interests. See Note 1 and Note 2.

⁽²⁾  Includes deferred taxes on capitalized interest of $0.3 million associated with the acquisition of the TEFR Interests as of September 30, 2014.

See accompanying Notes to Consolidated Financial Statements.

6

WESTERN GAS PARTNERS, LP

CONSOLIDATED STATEMENTS OF CASH FLOWS

(UNAUDITED)

	Nine Months Ended   September 30,
thousands	2014			2013 (1)
Cash flows from operating activities
Net income	$	296,149		$	196,703
Adjustments to reconcile net income to net cash provided by operating activities:
Depreciation, amortization and impairments	130,009			106,551
Non-cash equity-based compensation expense	3,210			2,564
Deferred income taxes	642			29,216
Debt-related amortization and other items, net	2,045			1,756
Equity income, net (2)	(41,322		)	(11,944		)
Distributions from equity investment earnings (2)	43,061			15,563
Changes in assets and liabilities:
(Increase) decrease in accounts receivable, net	(41,408		)	(27,387		)
Increase (decrease) in accounts and natural gas imbalance payables and accrued liabilities, net	9,736			6,818
Change in other items, net	1,645			(2,523		)
Net cash provided by operating activities	403,767			317,317
Cash flows from investing activities
Capital expenditures	(492,287		)	(469,678		)
Contributions in aid of construction costs from affiliates	183			—
Acquisitions from affiliates	(372,393		)	(469,884		)
Acquisitions from third parties	—			(240,274		)
Investments in equity affiliates	(63,267		)	(252,308		)
Distributions from equity investments in excess of cumulative earnings (2)	14,387			—
Proceeds from the sale of assets to affiliates	—			82
Proceeds from the sale of assets to third parties	5			14
Net cash used in investing activities	(913,372		)	(1,432,048		)
Cash flows from financing activities
Borrowings, net of debt issuance costs	1,136,878			842,566
Repayments of debt	(480,000		)	(495,000		)
Increase (decrease) in outstanding checks	2,908			(3,335		)
Proceeds from the issuance of common and general partner units, net of offering expenses	101,502			427,848
Distributions to unitholders	(297,013		)	(215,115		)
Contributions from noncontrolling interest owner	—			2,247
Distributions to noncontrolling interest owner	(11,349		)	(8,001		)
Net contributions from Anadarko	23,788			181,904
Net cash provided by financing activities	476,714			733,114
Net increase (decrease) in cash and cash equivalents	(32,891		)	(381,617		)
Cash and cash equivalents at beginning of period	100,728			419,981
Cash and cash equivalents at end of period	$	67,837		$	38,364
Supplemental disclosures
Net distributions to Anadarko of other assets	$	6,398		$	4,080
Interest paid, net of capitalized interest	43,504			34,974
Taxes paid (reimbursements received)	(340		)	—
Capital lease asset transfer (3)	4,833			—

⁽¹⁾  Financial information has been recast to include the financial position and results attributable to the TEFR Interests. See Note 1 and Note 2.

⁽²⁾  Income earned on, distributions from and contributions to equity investments are classified as affiliate. See Note 1.

⁽³⁾  For the nine months ended September 30, 2014, represents transfers of $0.2 million and $4.6 million from other current assets and other long-term assets, respectively, associated with the capital lease components of a processing agreement. See Note 6.

See accompanying Notes to Consolidated Financial Statements.

7

WESTERN GAS PARTNERS, LP

NOTES TO CONSOLIDATED FINANCIAL STATEMENTS

(UNAUDITED)

1.  DESCRIPTION OF BUSINESS AND BASIS OF PRESENTATION

General. Western Gas Partners, LP is a growth-oriented Delaware master limited partnership formed by Anadarko Petroleum Corporation in 2007 to own, operate, acquire and develop midstream energy assets.

For purposes of these consolidated financial statements, the “Partnership” refers to Western Gas Partners, LP and its subsidiaries. The Partnership’s general partner, Western Gas Holdings, LLC (the “general partner” or “GP”), is owned by Western Gas Equity Partners, LP (“WGP”), a Delaware master limited partnership formed by Anadarko Petroleum Corporation in September 2012 to own the Partnership’s general partner, as well as a significant limited partner interest in the Partnership (see Western Gas Equity Partners, LP below). Western Gas Equity Holdings, LLC is WGP’s general partner and is a wholly owned subsidiary of Anadarko Petroleum Corporation. “Anadarko” refers to Anadarko Petroleum Corporation and its subsidiaries, excluding the Partnership and the general partner, and “affiliates” refers to subsidiaries of Anadarko, excluding the Partnership, and includes equity interests in Fort Union Gas Gathering, LLC (“Fort Union”), White Cliffs Pipeline, LLC (“White Cliffs”), Rendezvous Gas Services, LLC (“Rendezvous”), Enterprise EF78, LLC (the “Mont Belvieu JV”), Texas Express Pipeline LLC (“TEP”), Texas Express Gathering LLC (“TEG”) and Front Range Pipeline LLC (“FRP”) (see Note 2). The interests in TEP, TEG and FRP are referred to collectively as the “TEFR Interests.” All income earned on, distributions from and contributions to the Partnership’s equity investments are considered to be affiliate transactions. “Equity investment throughput” refers to the Partnership’s 14.81% share of average Fort Union throughput and 22% share of average Rendezvous throughput, but excludes throughput measured in barrels, consisting of the Partnership’s 10% share of average White Cliffs throughput, 25% share of average Mont Belvieu JV throughput, 20% share of average TEP and TEG throughput and 33.33% share of average FRP throughput. The “DJ Basin complex” refers to the Platte Valley system, Wattenberg system, and Lancaster plant, all of which were combined into a single complex in the first quarter of 2014.

The Partnership is engaged in the business of gathering, processing, compressing, treating and transporting natural gas, condensate, NGLs and crude oil for Anadarko, as well as for third-party producers and customers. As of September 30, 2014, the Partnership’s assets and investments accounted for under the equity method consisted of the following:

	Owned and Operated	Operated Interests	Non-Operated Interests	Equity Interests
Natural gas gathering systems	13	1	5	2
NGL gathering systems	—	—	—	2
Natural gas treating facilities	8	—	—	1
Natural gas processing facilities	9	3	—	2
NGL pipelines	3	—	—	2
Natural gas pipelines	3	—	—	—
Oil pipeline	—	—	—	1

These assets and investments are located in the Rocky Mountains (Colorado, Utah and Wyoming), the Mid-Continent (Kansas and Oklahoma), north-central Pennsylvania and Texas. The Partnership completed construction of Train I at the Lancaster processing plant (located in the DJ Basin complex) in Northeast Colorado in April 2014, and is constructing Train II at the same plant with operations expected to commence in the second quarter of 2015.

Western Gas Equity Partners, LP. WGP owns the following types of interests in the Partnership: (i) the 2.0% general partner interest and all of the incentive distribution rights (“IDRs”) in the Partnership, both owned through WGP’s 100% ownership of the Partnership’s general partner and (ii) a significant limited partner interest (see Holdings of Partnership equity in Note 4). WGP has no independent operations or material assets other than its partnership interests in the Partnership.

8

WESTERN GAS PARTNERS, LP

NOTES TO CONSOLIDATED FINANCIAL STATEMENTS

(UNAUDITED)

1.  DESCRIPTION OF BUSINESS AND BASIS OF PRESENTATION (CONTINUED)

Basis of presentation. The consolidated financial statements have been prepared in accordance with generally accepted accounting principles in the United States (“GAAP”). The consolidated financial statements include the accounts of the Partnership and entities in which it holds a controlling financial interest. All significant intercompany transactions have been eliminated. Investments in non-controlled entities over which the Partnership exercises significant influence are accounted for under the equity method. The Partnership proportionately consolidates its 33.75% share of the assets, liabilities, revenues and expenses attributable to the Non-Operated Marcellus Interest and Anadarko-Operated Marcellus Interest (see Note 2) and its 50% share of the assets, liabilities, revenues and expenses attributable to the Newcastle system in the accompanying consolidated financial statements. The 25% membership interest in Chipeta Processing LLC (“Chipeta”) held by a third-party member is reflected within noncontrolling interest in the consolidated financial statements for all periods presented.

In preparing financial statements in accordance with GAAP, management makes informed judgments and estimates that affect the reported amounts of assets, liabilities, revenues and expenses. Management evaluates its estimates and related assumptions regularly, using historical experience and other methods considered reasonable under the particular circumstances. Changes in facts and circumstances or additional information may result in revised estimates and actual results may differ from these estimates. Effects on the business, financial condition and results of operations resulting from revisions to estimates are recognized when the facts that give rise to the revisions become known. The information furnished herein reflects all normal recurring adjustments which are, in the opinion of management, necessary for a fair presentation of the consolidated financial statements, and certain prior-period amounts have been reclassified to conform to the current-year presentation.

Certain information and note disclosures commonly included in annual financial statements have been condensed or omitted pursuant to the rules and regulations of the Securities and Exchange Commission (“SEC”). Accordingly, the accompanying consolidated financial statements and notes should be read in conjunction with the Partnership’s 2013 Form 10-K, as filed with the SEC on February 28, 2014, certain sections of which were recast to reflect the results of the TEFR Interests in the Partnership’s Current Report on Form 8-K, as filed with the SEC on August 27, 2014. Management believes that the disclosures made are adequate to make the information not misleading.

Presentation of Partnership assets. The “Partnership assets” refer collectively to the assets owned and interests accounted for under the equity method by the Partnership as of September 30, 2014. Because Anadarko controls the Partnership through its ownership and control of WGP, which owns the Partnership’s general partner, each acquisition of Partnership assets from Anadarko has been considered a transfer of net assets between entities under common control. As such, the Partnership assets acquired from Anadarko were initially recorded at Anadarko’s historic carrying value, which did not correlate to the total acquisition price paid by the Partnership. Further, after an acquisition of Partnership assets from Anadarko, the Partnership may be required to recast its financial statements to include the activities of the Partnership assets as of the date of common control. See Note 2.

For those periods requiring recast, the consolidated financial statements for periods prior to the Partnership’s acquisition of the Partnership assets from Anadarko have been prepared from Anadarko’s historical cost-basis accounts and may not necessarily be indicative of the actual results of operations that would have occurred if the Partnership had owned the Partnership assets during the periods reported. Net income attributable to the Partnership assets acquired from Anadarko for periods prior to the Partnership’s acquisition of the Partnership assets is not allocated to the limited partners for purposes of calculating net income per common unit.

9

WESTERN GAS PARTNERS, LP

NOTES TO CONSOLIDATED FINANCIAL STATEMENTS

(UNAUDITED)

1.  DESCRIPTION OF BUSINESS AND BASIS OF PRESENTATION (CONTINUED)

Equity investments.The following table presents the activity in the Partnership’s equity investments for the nine months ended September 30, 2014:

	Equity Investments
thousands	Fort Union			White Cliffs			Rendezvous			Mont Belvieu JV			TEG			TEP			FRP			Total
Balance at December 31, 2013	$	25,172		$	35,039		$	60,928		$	122,480		$	16,649		$	197,731		$	135,401		$	593,400
Investment earnings (loss), net of amortization	4,811			8,385			1,180			22,872			466			3,488			120			41,322
Contributions	—			10,456			—			3,956			352			6,263			40,033			61,060
Capitalized interest	—			—			—			—			—			—			857			857
Distributions	(4,619		)	(7,949		)	(2,636		)	(24,423		)	(373		)	(2,938		)	(123		)	(43,061		)
Distributions in excess of cumulative earnings (1)	—			(891		)	(1,993		)	—			(338		)	(5,321		)	(5,844		)	(14,387		)
Balance at September 30, 2014	$	25,364		$	45,040		$	57,479		$	124,885		$	16,756		$	199,223		$	170,444		$	639,191

⁽¹⁾  Distributions in excess of cumulative earnings, classified as investing cash flows in the consolidated statements of cash flows, is calculated on an individual investment basis.

Recently issued accounting standards. Accounting Standards Update (“ASU”) 2014-09, Revenue from Contracts with Customers, supersedes the revenue recognition requirements inTopic605, Revenue Recognition, and industry-specific guidance in Subtopic 932-605, Extractive Activities—Oil and Gas—Revenue Recognition, and requires an entity to recognize revenue when it transfers promised goods or services to customers in an amount that reflects the consideration to which the entity expects to be entitled in exchange for those goods or services. This ASU is effective for annual and interim periods beginning in 2017 and is required to be adopted using one of two retrospective application methods, with no early adoption permitted. The Partnership is currently evaluating the impact of the adoption of this ASU on its consolidated financial statements.

ASU 2014-08, Reporting Discontinued Operations and Disclosures of Disposals of Components of an Entity,changes the criteria for reporting discontinued operations and requires additional disclosures, both for discontinued operations and for individually significant dispositions and assets classified as held for sale not qualifying as discontinued operations. This ASU is effective for annual and interim periods beginning in 2015, with early adoption permitted for disposals or for assets classified as held for sale that have not been reported in previously issued financial statements. The Partnership early adopted this ASU on a prospective basis beginning with the first quarter of 2014. The adoption did not have a material impact on the Partnership’s consolidated financial statements.

ASU 2013-11, Presentation of an Unrecognized Tax Benefit When a Net Operating Loss Carryforward, a Similar Tax Loss, or a Tax Credit Carryforward Exists,requires that an unrecognized tax benefit, or a portion of an unrecognized tax benefit, be presented in the financial statements as a reduction to a deferred tax asset, except in certain circumstances. This ASU is effective for annual and interim periods beginning in 2014. The Partnership adopted this ASU on a prospective basis beginning with the first quarter of 2014. The adoption did not have a material impact on the Partnership’s consolidated financial statements.

10

WESTERN GAS PARTNERS, LP

NOTES TO CONSOLIDATED FINANCIAL STATEMENTS

(UNAUDITED)

2.  ACQUISITIONS

The following table presents the acquisitions completed by the Partnership during 2014 and 2013, and identifies the funding sources for such acquisitions:

thousands except unit and percent amounts	Acquisition Date	Percentage Acquired		Borrowings		Cash On Hand		Common Units Issued
Non-Operated Marcellus Interest (1)	03/01/2013	33.75	%	$	250,000	$	215,500	449,129
Anadarko-Operated Marcellus Interest (2)	03/08/2013	33.75	%	133,500		—		—
Mont Belvieu JV (3)	06/05/2013	25	%	—		78,129		—
OTTCO (4)	09/03/2013	100	%	27,500		—		—
TEFR Interests (5)	03/03/2014	Various (5)		350,000		6,250		308,490

⁽¹⁾  The Partnership acquired Anadarko’s 33.75% interest (non-operated) in the Liberty and Rome gas gathering systems, serving production from the Marcellus shale in north-central Pennsylvania. The interest acquired is referred to as the “Non-Operated Marcellus Interest.” In connection with the issuance of the common units, the Partnership’s general partner purchased 9,166 general partner units for consideration of $0.5 million to maintain its 2.0% general partner interest in the Partnership.

⁽²⁾  The Partnership acquired a 33.75% interest in each of the Larry’s Creek, Seely and Warrensville gas gathering systems, which are operated by Anadarko and serve production from the Marcellus shale in north-central Pennsylvania, from a third party. The interest acquired is referred to as the “Anadarko-Operated Marcellus Interest.” During the third quarter of 2013, the Partnership recorded a $1.1 million decrease in the assets acquired and liabilities assumed in the acquisition, representing the final purchase price allocation.

⁽³⁾  The Partnership acquired a 25% interest in the Mont Belvieu JV, an entity formed to design, construct, and own two fractionation trains located in Mont Belvieu, Texas, from a third party. The interest acquired is accounted for under the equity method of accounting.

⁽⁴⁾  The Partnership acquired Overland Trail Transmission, LLC (“OTTCO”), a Delaware limited liability company, from a third party. OTTCO owns and operates an intrastate pipeline that connects the Partnership’s Red Desert and Granger complexes in southwestern Wyoming.

⁽⁵⁾  The Partnership acquired a 20% interest in each of TEG and TEP and a 33.33% interest in FRP from Anadarko. These assets gather and transport NGLs primarily from the Anadarko and Denver-Julesburg Basins. The interests in these entities are accounted for under the equity method of accounting. In connection with the issuance of the common units, the Partnership’s general partner purchased 6,296 general partner units for consideration of $0.4 million to maintain its 2.0% general partner interest in the Partnership.

TEFR Interests acquisition. Because the acquisition of the TEFR Interests was a transfer of net assets between entities under common control, the Partnership’s historical financial statements previously filed with the SEC have been recast in this Form 10-Q to include the results attributable to the TEFR Interests for all periods presented. The consolidated financial statements for periods prior to the Partnership’s acquisition of the TEFR Interests have been prepared from Anadarko’s historical cost-basis accounts and may not necessarily be indicative of the actual results of operations that would have occurred if the Partnership had owned the TEFR Interests during the periods reported.

11

WESTERN GAS PARTNERS, LP

NOTES TO CONSOLIDATED FINANCIAL STATEMENTS

(UNAUDITED)

2.  ACQUISITIONS (CONTINUED)

The following table presents the impact of the TEFR Interests on revenues, equity income (loss), net and net income (loss) as presented in the Partnership’s historical consolidated statements of income:

	Three Months Ended September 30, 2013
thousands	Partnership Historical		TEFR Interests		Combined
Revenues	$	273,502	$	—	$	273,502
Equity income (loss), net	4,499		21		4,520
Net income (loss)	81,776		106		81,882

	Nine Months Ended September 30, 2013
thousands	Partnership Historical		TEFR Interests			Combined
Revenues	$	750,670	$	—		$	750,670
Equity income (loss), net	12,204		(260		)	11,944
Net income (loss)	196,724		(21		)	196,703

3.  PARTNERSHIP DISTRIBUTIONS

The partnership agreement of Western Gas Partners, LP requires the Partnership to distribute all of its available cash (as defined in the partnership agreement) to unitholders of record on the applicable record date within 45 days of the end of each quarter. The board of directors of the general partner declared the following cash distributions to the Partnership’s unitholders for the periods presented:

thousands except per-unit amounts Quarters Ended	Total Quarterly Distribution per Unit		Total Quarterly Cash Distribution		Date of Distribution
2013
March 31	$	0.540	$	70,143	May 2013
June 30	0.560		79,315		August 2013
September 30	0.580		83,986		November 2013
2014
March 31	$	0.625	$	98,749	May 2014
June 30	0.650		105,655		August 2014
September 30 (1)	0.675		111,609		November 2014

⁽¹⁾  On October 20, 2014, the board of directors of the Partnership’s general partner declared a cash distribution to the Partnership’s unitholders of $0.675 per unit, or $111.6 million in aggregate, including incentive distributions. The cash distribution is payable on November 13, 2014, to unitholders of record at the close of business on October 31, 2014.

12

WESTERN GAS PARTNERS, LP

NOTES TO CONSOLIDATED FINANCIAL STATEMENTS

(UNAUDITED)

4.  EQUITY AND PARTNERS’ CAPITAL

Equity offerings. The Partnership completed the following public offerings of its common units during 2014 and 2013:

thousands except unit    and per-unit amounts	Common Units Issued	GP Units Issued(1)	Price Per Unit		Underwriting Discount and Other Offering Expenses		Net Proceeds
May 2013 equity offering (2)	7,015,000	143,163	$	61.18	$	13,203	$	424,733
December 2013 equity offering (3)	4,800,000	97,959	61.51		9,447		291,827
Continuous Offering Program - 2013 (4)	685,735	13,996	60.84		965		41,603
Continuous Offering Program - 2014 (5)	1,133,384	23,132	73.48		1,726		83,257

⁽¹⁾  Represents general partner units issued to the general partner in exchange for the general partner’s proportionate capital contribution to maintain its 2.0% general partner interest in the Partnership.

⁽²⁾  Includes the issuance of 915,000 common units pursuant to the full exercise of the underwriters’ over-allotment option granted in connection with the May 2013 equity offering.

⁽³⁾  Includes the issuance of 300,000 common units on January 3, 2014, pursuant to the partial exercise of the underwriters’ over-allotment option granted in connection with the December 2013 equity offering. Net proceeds from this partial exercise (including the general partner’s proportionate capital contribution) were $18.1 million.

⁽⁴⁾  Represents common and general partner units issued during the year ended December 31, 2013, pursuant to the Partnership’s registration statement filed with the SEC in August 2012 authorizing the issuance of up to an aggregate of $125.0 million of common units (the “Continuous Offering Program”). Gross proceeds generated (including the general partner’s proportionate capital contributions) during the year ended December 31, 2013, were $42.6 million. The price per unit in the table above represents an average price for all issuances under the Continuous Offering Program during 2013.

⁽⁵⁾  Represents common and general partner units issued during the nine months ended September 30, 2014, under the Continuous Offering Program. Gross proceeds generated (including the general partner’s proportionate capital contributions) were $85.0 million. The price per unit in the table above represents an average price for all issuances under the Continuous Offering Program during the nine months ended September 30, 2014. As of September 30, 2014, the Partnership had used all the capacity to issue common units under this registration statement.

Common and general partner units. The Partnership’s common units are listed on the New York Stock Exchange under the symbol “WES.”

The following table summarizes common and general partner units issued during the nine months ended September 30, 2014:

	Common Units	General Partner Units	Total
Balance at December 31, 2013	117,322,812	2,394,345	119,717,157
December 2013 equity offering	300,000	6,122	306,122
Long-Term Incentive Plan awards	5,418	112	5,530
TEFR Interests acquisition	308,490	6,296	314,786
Continuous Offering Program	1,133,384	23,132	1,156,516
Balance at September 30, 2014	119,070,104	2,430,007	121,500,111

Holdings of Partnership equity. As of September 30, 2014, WGP held 49,296,205 common units, representing a 40.6% limited partner interest in the Partnership, and, through its ownership of the general partner, WGP indirectly held 2,430,007 general partner units, representing a 2.0% general partner interest in the Partnership, and 100% of the Partnership’s IDRs. As of September 30, 2014, other subsidiaries of Anadarko held 757,619 common units, representing a 0.6% limited partner interest in the Partnership. As of September 30, 2014, the public held 69,016,280 common units, representing a 56.8% limited partner interest in the Partnership.

13

WESTERN GAS PARTNERS, LP

NOTES TO CONSOLIDATED FINANCIAL STATEMENTS

(UNAUDITED)

4.  EQUITY AND PARTNERS’ CAPITAL (CONTINUED)

The Partnership’s net income earned on and subsequent to the date of the acquisition of the Partnership assets (as defined in Note 1) is allocated to the general partner and the limited partners consistent with actual cash distributions, including incentive distributions allocable to the general partner. Undistributed earnings (net income in excess of distributions) or undistributed losses (available cash in excess of net income) are then allocated to the general partner and the limited partners in accordance with their respective ownership percentages.

Basic and diluted net income per common unit are calculated by dividing the limited partners’ interest in net income by the weighted average number of common units outstanding during the period. The common units issued in connection with acquisitions and equity offerings are included on a weighted-average basis for periods during which they were outstanding.

5.  TRANSACTIONS WITH AFFILIATES

Affiliate transactions. Revenues from affiliates include amounts earned by the Partnership from services provided to Anadarko as well as from the sale of residue, condensate and NGLs to Anadarko. In addition, the Partnership purchases natural gas from an affiliate of Anadarko pursuant to gas purchase agreements. Operating and maintenance expense includes amounts accrued for or paid to affiliates for the operation of the Partnership assets, whether in providing services to affiliates or to third parties, including field labor, measurement and analysis, and other disbursements. A portion of the Partnership’s general and administrative expenses is paid by Anadarko, which results in affiliate transactions pursuant to the reimbursement provisions of the Partnership’s omnibus agreement. Affiliate expenses do not bear a direct relationship to affiliate revenues, and third-party expenses do not bear a direct relationship to third-party revenues. See Note 1 for further information related to contributions of assets to the Partnership by Anadarko.

Cash management. Anadarko operates a cash management system whereby excess cash from most of its subsidiaries’ separate bank accounts is generally swept to centralized accounts. Prior to the Partnership’s acquisition of the Partnership assets, third-party sales and purchases related to such assets were received or paid in cash by Anadarko within its centralized cash management system. Anadarko charged or credited the Partnership interest at a variable rate on outstanding affiliate balances for the periods these balances remained outstanding. The outstanding affiliate balances were entirely settled through an adjustment to net investment by Anadarko in connection with the acquisition of the Partnership assets. Subsequent to the acquisition of Partnership assets from Anadarko, transactions related to such assets are cash-settled directly with third parties and with Anadarko affiliates, and affiliate-based interest expense on current intercompany balances is not charged. Chipeta cash settles its transactions directly with third parties and Anadarko, as well as with the other subsidiaries of the Partnership.

Note receivable from Anadarko. Concurrently with the closing of the Partnership’s May 2008 initial public offering, the Partnership loaned $260.0 million to Anadarko in exchange for a 30-year note bearing interest at a fixed annual rate of 6.50%, payable quarterly. The fair value of the note receivable from Anadarko was $322.3 million and $296.7 million at September 30, 2014, and December 31, 2013, respectively. The fair value of the note reflects consideration of credit risk and any premium or discount for the differential between the stated interest rate and quarter-end market interest rate, based on quoted market prices of similar debt instruments. Accordingly, the fair value of the note receivable from Anadarko is measured using Level 2 inputs.

Commodity price swap agreements. The Partnership has commodity price swap agreements with Anadarko to mitigate exposure to commodity price volatility that would otherwise be present as a result of the purchase and sale of natural gas, condensate or NGLs. Notional volumes for each of the commodity price swap agreements are not specifically defined; instead, the commodity price swap agreements apply to the actual volume of natural gas, condensate and NGLs purchased and sold at the Granger, Hilight, Hugoton, Newcastle and MGR assets, as well as the DJ Basin complex, with various expiration dates through December 2016. In December 2013, the Partnership extended the commodity price swap agreements for the Hilight and Newcastle assets through December 2014. The commodity price swap agreements do not satisfy the definition of a derivative financial instrument and, therefore, are not required to be measured at fair value.

14

WESTERN GAS PARTNERS, LP

NOTES TO CONSOLIDATED FINANCIAL STATEMENTS

(UNAUDITED)

5.  TRANSACTIONS WITH AFFILIATES (CONTINUED)

Below is a summary of the fixed price ranges on the Partnership’s outstanding commodity price swap agreements as of September 30, 2014:

per barrel except natural gas	2014					2015					2016
Ethane	$	18.36	−	$	30.53	$	18.41	−	$	23.41	$	23.11
Propane	40.38		−	53.78		47.08		−	52.99		52.90
Isobutane	61.24		−	75.13		62.09		−	74.02		73.89
Normal butane	53.89		−	66.83		54.62		−	65.04		64.93
Natural gasoline	71.85		−	90.89		72.88		−	81.82		81.68
Condensate	75.22		−	87.30		76.47		−	81.82		81.68
Natural gas (per MMBtu)	3.45		−	6.20		4.66		−	5.96		4.87

The following table summarizes realized gains and losses on commodity price swap agreements:

	Three Months Ended   September 30,						Nine Months Ended   September 30,
thousands	2014			2013			2014			2013
Gains (losses) on commodity price swap agreements related to sales: (1)
Natural gas sales	$	3,179		$	6,923		$	1,525		$	14,707
Natural gas liquids sales	22,737			27,541			66,746			83,049
Total	25,916			34,464			68,271			97,756
Losses on commodity price swap agreements related to purchases (2)	(19,533		)	(23,902		)	(38,081		)	(66,613		)
Net gains (losses) on commodity price swap agreements	$	6,383		$	10,562		$	30,190		$	31,143

⁽¹⁾  Reported in affiliate natural gas, natural gas liquids and condensate sales in the consolidated statements of income in the period in which the related sale is recorded.

⁽²⁾  Reported in cost of product in the consolidated statements of income in the period in which the related purchase is recorded.

Gas gathering and processing agreements. The Partnership has significant gas gathering and processing arrangements with affiliates of Anadarko on a majority of its systems. The Partnership’s gathering, transportation and treating throughput (excluding equity investment throughput and throughput measured in barrels) attributable to natural gas production owned or controlled by Anadarko was 47% and 53% for the three months ended September 30, 2014 and 2013, respectively, and 48% and 55% for the nine months ended September 30, 2014 and 2013, respectively. The Partnership’s processing throughput (excluding equity investment throughput and throughput measured in barrels) attributable to natural gas production owned or controlled by Anadarko was 58% and 60% for the three months ended September 30, 2014 and 2013, respectively, and 58% and 59% for the nine months ended September 30, 2014 and 2013.

Equipment purchases and sales. The following table summarizes the Partnership’s purchases from and sales to Anadarko of pipe and equipment:

	Nine Months Ended September 30,
	2014		2013		2014		2013
thousands	Purchases				Sales
Cash consideration	$	16,143	$	6,167	$	—	$	82
Net carrying value	9,745		2,039		—		34
Partners’ capital adjustment	$	6,398	$	4,128	$	—	$	48

15

WESTERN GAS PARTNERS, LP

NOTES TO CONSOLIDATED FINANCIAL STATEMENTS

(UNAUDITED)

5.  TRANSACTIONS WITH AFFILIATES (CONTINUED)

WES LTIP. The general partner awards phantom units under the Western Gas Partners, LP 2008 Long-Term Incentive Plan (“WES LTIP”) primarily to its independent directors and its Chief Executive Officer. The phantom units awarded to the independent directors vest one year from the grant date, while all other awards are subject to graded vesting over a three-year service period. Compensation expense is recognized over the vesting period and was $0.2 million and $0.5 million for the three and nine months ended September 30, 2014, respectively, and $0.1 million and $0.4 million for the three and nine months ended September 30, 2013, respectively.

WGP LTIP and Anadarko Incentive Plans. The Partnership’s general and administrative expenses included $0.9 million and $2.7 million for the three and nine months ended September 30, 2014, respectively, and $0.8 million and $2.2 million for the three and nine months ended September 30, 2013, respectively, of equity-based compensation expense, allocated to the Partnership by Anadarko, for awards granted to the executive officers of the general partner and other employees under the Western Gas Equity Partners, LP 2012 Long-Term Incentive Plan (“WGP LTIP”) and Anadarko Incentive Plans. For the nine months ended September 30, 2014, $2.5 million of allocated equity-based compensation expense is reflected as a contribution to partners’ capital in the Partnership’s consolidated statement of equity and partners’ capital.

Summary of affiliate transactions. The following table summarizes affiliate transactions, which include revenue from affiliates, reimbursement of operating expenses and purchases of natural gas:

	Three Months Ended   September 30,				Nine Months Ended   September 30,
thousands	2014		2013		2014		2013
Revenues (1)	$	245,500	$	213,125	$	708,456	$	591,010
Equity income, net (1)	19,063		4,520		41,322		11,944
Cost of product (1)	22,728		33,753		74,592		97,801
Operation and maintenance (2)	14,556		13,469		42,472		41,021
General and administrative (3)	6,566		5,867		19,859		17,325
Operating expenses	43,850		53,089		136,923		156,147
Interest income, net (4)	4,225		4,225		12,675		12,675
Distributions to unitholders (5)	60,794		44,378		169,001		121,493

⁽¹⁾  Represents amounts earned or incurred on and subsequent to the date of acquisition of the Partnership assets, as well as amounts earned or incurred by Anadarko on a historical basis related to the Partnership assets prior to the acquisition of such assets, recognized under gathering, treating or processing agreements, and purchase and sale agreements.

⁽²⁾  Represents expenses incurred on and subsequent to the date of the acquisition of the Partnership assets, as well as expenses incurred by Anadarko on a historical basis related to the Partnership assets prior to the acquisition of such assets.

⁽³⁾  Represents general and administrative expense incurred on and subsequent to the date of the Partnership’s acquisition of the Partnership assets, as well as a management services fee for reimbursement of expenses incurred by Anadarko for periods prior to the acquisition of the Partnership assets by the Partnership. These amounts include equity-based compensation expense allocated to the Partnership by Anadarko (see WES LTIP and WGP LTIP and Anadarko Incentive Plans within this Note 5).

⁽⁴⁾  Represents interest income recognized on the note receivable from Anadarko.

⁽⁵⁾  Represents distributions paid under the partnership agreement (see Note 3 and Note 4).

Concentration of credit risk. Anadarko was the only customer from whom revenues exceeded 10% of the Partnership’s consolidated revenues for all periods presented in the consolidated statements of income.

16

WESTERN GAS PARTNERS, LP

NOTES TO CONSOLIDATED FINANCIAL STATEMENTS

(UNAUDITED)

6.  PROPERTY, PLANT AND EQUIPMENT

A summary of the historical cost of the Partnership’s property, plant and equipment is as follows:

thousands	Estimated Useful Life	September 30, 2014		December 31, 2013
Land	n/a	$	2,584	$	2,584
Gathering systems	3 to 47 years	4,244,640		3,673,008
Pipelines and equipment	15 to 45 years	145,851		146,008
Assets under construction	n/a	345,799		405,633
Other	3 to 40 years	15,405		11,867
Total property, plant and equipment		4,754,279		4,239,100
Accumulated depreciation		986,692		855,845
Net property, plant and equipment		$	3,767,587	$	3,383,255

The cost of property classified as “Assets under construction” is excluded from capitalized costs being depreciated. These amounts represent property that is not yet suitable to be placed into productive service as of the respective balance sheet date.

At December 31, 2013, other long-term assets includes $4.6 million of unguaranteed residual value related to the capital lease component of a processing agreement assumed in connection with the acquisition of the Granger straddle plant as a part of the Mountain Gas Resources, LLC acquisition in January 2012. This agreement, in which the Partnership was the lessor, was replaced effective April 1, 2014, with a gas conditioning agreement that does not satisfy criteria required for lease classification. As such, during the second quarter of 2014, the Partnership reclassified the $4.6 million capital lease asset from other long-term assets to property, plant and equipment and commenced depreciation.

During the three and nine months ended September 30, 2014, the Partnership recognized impairments of $0.4 million and $0.7 million, respectively, related to the cancellation of various capital projects by the third-party operator of the Non-Operated Marcellus Interest. During the three months ended September 30, 2014, the Partnership also recognized an impairment of $0.5 million related to a compressor no longer in service at the Hilight system. During the first quarter of 2014, the Partnership recognized a $1.2 million impairment primarily related to a non-operational plant in the Powder River Basin that was impaired to its estimated fair value of $2.4 million, using Level 3 fair-value inputs.

7.  COMPONENTS OF WORKING CAPITAL

A summary of other current assets is as follows:

thousands	September 30, 2014		December 31, 2013
Natural gas liquids inventory	$	2,022	$	2,584
Natural gas imbalance receivables	1,181		3,605
Prepaid insurance	2,521		2,123
Other	1,049		1,710
Total other current assets	$	6,773	$	10,022

17

WESTERN GAS PARTNERS, LP

NOTES TO CONSOLIDATED FINANCIAL STATEMENTS

(UNAUDITED)

7.  COMPONENTS OF WORKING CAPITAL (CONTINUED)

A summary of accrued liabilities is as follows:

thousands	September 30, 2014		December 31, 2013
Accrued capital expenditures	$	92,559	$	94,750
Accrued plant purchases	30,563		21,396
Accrued interest expense	28,525		18,119
Short-term asset retirement obligations	483		1,966
Short-term remediation and reclamation obligations	562		562
Other	186		218
Total accrued liabilities	$	152,878	$	137,011

8.  DEBT AND INTEREST EXPENSE

At September 30, 2014, the Partnership’s debt consisted of 5.375% Senior Notes due 2021 (the “2021 Notes”), 4.000% Senior Notes due 2022 (the “2022 Notes”), 2.600% Senior Notes due 2018 (the “2018 Notes”), 5.450% Senior Notes due 2044 (the “2044 Notes”), and the senior unsecured revolving credit facility (“RCF”). The two tranches of the 2022 Notes, issued in June and October 2012, were issued under the same indenture and are considered a single class of securities. The two tranches of the 2018 Notes, issued in August 2013 and March 2014, were issued under the same indenture and are considered a single class of securities.

The following table presents the Partnership’s outstanding debt as of September 30, 2014, and December 31, 2013:

	September 30, 2014						December 31, 2013
thousands	Principal		Carrying Value		Fair Value(1)		Principal		Carrying Value		Fair Value (1)
5.375% Senior Notes due 2021	$	500,000	$	495,576	$	557,828	$	500,000	$	495,173	$	533,615
4.000% Senior Notes due 2022	670,000		673,017		690,811		670,000		673,278		641,237
Revolving credit facility	170,000		170,000		170,000		—		—		—
2.600% Senior Notes due 2018	350,000		350,506		355,311		250,000		249,718		247,988
5.450% Senior Notes due 2044	400,000		393,815		437,573		—		—		—
Total debt outstanding	$	2,090,000	$	2,082,914	$	2,211,523	$	1,420,000	$	1,418,169	$	1,422,840

⁽¹⁾  Fair value is measured using Level 2 inputs.

Debt activity. The following table presents the debt activity of the Partnership for the nine months ended September 30, 2014:

thousands	Carrying Value
Balance at December 31, 2013	$	1,418,169
Revolving credit facility borrowings	650,000
Issuance of 5.450% Senior Notes due 2044	400,000
Issuance of 2.600% Senior Notes due 2018	100,000
Repayments of revolving credit facility	(480,000		)
Other	(5,255		)
Balance at September 30, 2014	$	2,082,914

18

WESTERN GAS PARTNERS, LP

NOTES TO CONSOLIDATED FINANCIAL STATEMENTS

(UNAUDITED)

8.  DEBT AND INTEREST EXPENSE (CONTINUED)

Senior Notes. The 2044 Notes issued in March 2014 were offered at a price to the public of 98.443% of the face amount. Including the effects of the issuance and underwriting discounts, the effective interest rate of the 2044 Notes is 5.633%. Interest is paid semi-annually on April 1 and October 1 of each year. Proceeds (net of underwriting discount of $3.5 million, original issue discount and debt issuance costs) were used to repay amounts then outstanding under the Partnership’s RCF and for general partnership purposes.

The 2018 Notes issued in March 2014 were offered at a price to the public of 100.857% of the face amount. Including the effects of the issuance premium for the March 2014 offering, the issuance discount for the August 2013 offering of 2018 Notes and underwriting discounts, the effective interest rate of the 2018 Notes is 2.743%. Interest is paid semi-annually on February 15 and August 15 of each year. Proceeds (net of underwriting discount of $0.6 million, original issue premium and debt issuance costs) were used to repay amounts then outstanding under the Partnership’s RCF and for general partnership purposes.

At September 30, 2014, the Partnership was in compliance with all covenants under the indentures governing the 2021 Notes, 2022 Notes, 2018 Notes, and 2044 Notes.

Revolving credit facility. In February 2014, the Partnership entered into an amended and restated $1.2 billion senior unsecured RCF, which is expandable to a maximum of $1.5 billion, replacing an $800.0 million credit facility, which was originally entered into in March 2011. Subsequent to February 2014, the Partnership borrowed $350.0 million under the RCF to fund the acquisition of the TEFR Interests (see Note 2). The RCF matures in February 2019 and bears interest at London Interbank Offered Rate (“LIBOR”), plus applicable margins ranging from 0.975% to 1.45%, or an alternate base rate equal to the greatest of (a) the Prime Rate, (b) the Federal Funds Effective Rate plus 0.5%, or (c) LIBOR plus 1%, in each case plus applicable margins currently ranging from zero to 0.45%, based upon the Partnership’s senior unsecured debt rating. The interest rate on the RCF was 1.46% at September 30, 2014. At December 31, 2013, the interest rate on the previous credit facility was 1.67%. The Partnership is required to pay a quarterly facility fee currently ranging from 0.15% to 0.30% of the commitment amount (whether used or unused), based upon the Partnership’s senior unsecured debt rating. The facility fee rate was 0.20% and 0.25% at September 30, 2014, and December 31, 2013, respectively.

As of September 30, 2014, the Partnership had $170.0 million of outstanding borrowings, $12.8 million in outstanding letters of credit and $1.0 billion available for borrowing under the RCF. At September 30, 2014, the Partnership was in compliance with all covenants under the RCF. See Note 10.

The 2021 Notes, 2022 Notes, 2018 Notes, 2044 Notes and obligations under the RCF are recourse to the Partnership’s general partner. The Partnership’s general partner is indemnified by a wholly owned subsidiary of Anadarko, Western Gas Resources, Inc. (“WGRI”), against any claims made against the general partner under the 2022 Notes, 2021 Notes, and/or the RCF.

In connection with the acquisitions of the Non-Operated Marcellus Interest, the Anadarko-Operated Marcellus Interest, and the TEFR Interests, the Partnership’s general partner and other wholly owned subsidiaries of Anadarko entered into indemnification agreements, whereby such subsidiaries agreed to indemnify the Partnership’s general partner for any recourse liability it may have for RCF borrowings, or other debt financing, attributable to the acquisitions of the Non-Operated Marcellus Interest, the Anadarko-Operated Marcellus Interest, and the TEFR Interests. These indemnification agreements apply to the 2044 Notes, 2018 Notes, and/or RCF borrowings outstanding related to the aforementioned acquisitions.

The Partnership’s general partner, the other indemnifying subsidiaries of Anadarko and WGRI also amended and restated the indemnity agreements between them to (i) conform language among all the indemnification agreements and (ii) reduce the amount for which WGRI would indemnify the Partnership’s general partner by an amount equal to any amounts payable to the Partnership’s general partner under the indemnification agreements related to the acquisitions of the Non-Operated Marcellus Interest, the Anadarko-Operated Marcellus Interest, and the TEFR Interests.

19

WESTERN GAS PARTNERS, LP

NOTES TO CONSOLIDATED FINANCIAL STATEMENTS

(UNAUDITED)

8.  DEBT AND INTEREST EXPENSE (CONTINUED)

Interest expense. The following table summarizes the amounts included in interest expense:

	Three Months Ended   September 30,						Nine Months Ended   September 30,
thousands	2014			2013			2014			2013
Interest expense on long-term debt	$	21,671		$	14,994		$	59,251		$	43,783
Amortization of debt issuance costs and commitment fees	1,107			1,135			3,799			3,252
Capitalized interest	(1,900		)	(3,111		)	(7,347		)	(9,552		)
Interest expense	$	20,878		$	13,018		$	55,703		$	37,483

9.  COMMITMENTS AND CONTINGENCIES

Litigation and legal proceedings. In March 2011, DCP Midstream, LP (“DCP”) filed a lawsuit against Anadarko and others, including a Partnership subsidiary, Kerr-McGee Gathering, LLC, in Weld County District Court (the “Court”) in Colorado, alleging that Anadarko diverted gas from DCP’s gathering and processing facilities in breach of certain dedication agreements. In addition to various claims against Anadarko, DCP is claiming unjust enrichment and other damages against Kerr-McGee Gathering, LLC, the entity that holds the Wattenberg assets (located in the DJ Basin complex). Anadarko countersued DCP asserting that DCP has not properly allocated values and charges to Anadarko for the gas that DCP gathers and/or processes, and seeks a judgment that DCP has no valid gathering or processing rights to much of the gas production it is claiming, in addition to other claims.

In July 2011, the Court denied the defendants’ motion to dismiss without ruling on the merits. In August 2014, the judge scheduled a jury trial for July 2015. In preparation for trial, the parties amended their pleadings in October 2014 and are engaged in discovery and motion practice. Management does not believe the outcome of this proceeding will have a material effect on the Partnership’s financial condition, results of operations or cash flows. The Partnership intends to vigorously defend this litigation. Furthermore, without regard to the merit of DCP’s claims, management believes that the Partnership has adequate contractual indemnities covering the claims against it in this lawsuit.

In addition, from time to time, the Partnership is involved in legal, tax, regulatory and other proceedings in various forums regarding performance, contracts and other matters that arise in the ordinary course of business. Management is not aware of any such proceeding for which a final disposition could have a material adverse effect on the Partnership’s financial condition, results of operations or cash flows.

Other commitments. The Partnership has short-term payment obligations, or commitments, related to its capital spending programs, as well as those of its unconsolidated affiliates. As of September 30, 2014, the Partnership had unconditional payment obligations for services to be rendered or products to be delivered in connection with its capital projects of $70.5 million, the majority of which is expected to be paid in the next twelve months. These commitments relate primarily to projects at the DJ Basin complex, which include the continued construction of a second train and compressor expansions.

Lease commitments. Anadarko, on behalf of the Partnership, has entered into lease agreements for corporate offices, shared field offices and a warehouse supporting the Partnership’s operations. The leases for the corporate offices and shared field offices extend through 2017 and 2018, respectively, and the lease for the warehouse extends through February 2015 and includes an early termination clause.

Rent expense associated with the office, warehouse and equipment leases was $0.7 million and $2.2 million for the three and nine months ended September 30, 2014, respectively, and $0.6 million and $2.0 million for the three and nine months ended September 30, 2013, respectively.

20

WESTERN GAS PARTNERS, LP

NOTES TO CONSOLIDATED FINANCIAL STATEMENTS

(UNAUDITED)

10.  SUBSEQUENT EVENT

On October 28, 2014, the Partnership announced its entry into an Agreement and Plan of Merger by and among the Partnership, Maguire Midstream, LLC, Nuevo Midstream, LLC (“Nuevo”) and the other parties thereto, pursuant to which the Partnership will acquire Nuevo for $1.5 billion in cash, subject to adjustment. Nuevo’s assets currently include a cryogenic processing complex, gas gathering system and related facilities and equipment. The assets serve production from Reeves, Loving and Culberson Counties, Texas and Eddy and Lea Counties, New Mexico.

The Partnership expects to fund this acquisition with (i) cash on hand, (ii) borrowings under the RCF and (iii) the issuance of $750.0 million of Class C units to Anadarko. The Class C units will receive distributions in the form of additional Class C units until the end of 2017 (unless earlier converted), and will be disregarded with respect to calculating the Partnership’s cash distributions until they are converted to common units. The Class C units will convert into common units on a one-for-one basis on December 31, 2017, unless the Partnership elects to convert such units earlier or Anadarko extends the conversion date.

Pursuant to the terms of a joint venture agreement between Anadarko and a third party, the Partnership has offered the third party the right to acquire a 50% interest in Nuevo. The third party is required to respond to the Partnership’s offer within thirty days of receiving notice, and will have an additional thirty days to fund its share of the purchase price if it accepts the offer. The Partnership is prepared to purchase 100% of Nuevo if the third party does not participate. The Partnership expects the acquisition will close in the fourth quarter of 2014 subject to regulatory approval and customary closing conditions.

21

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

For purposes of this report, “we,” “us,” “our,” the “Partnership,” or “Western Gas Partners” refers to Western Gas Partners, LP and its subsidiaries. Our general partner, Western Gas Holdings, LLC (the “general partner” or “GP”), is owned by Western Gas Equity Partners, LP (“WGP”), a Delaware master limited partnership formed by Anadarko Petroleum Corporation. Western Gas Equity Holdings, LLC is WGP’s general partner and is a wholly owned subsidiary of Anadarko Petroleum Corporation. “Anadarko” refers to Anadarko Petroleum Corporation and its subsidiaries, excluding the Partnership and our general partner, and “affiliates” refers to subsidiaries of Anadarko, excluding the Partnership, and includes equity interests in Fort Union Gas Gathering, LLC (“Fort Union”), White Cliffs Pipeline, LLC (“White Cliffs”), Rendezvous Gas Services, LLC (“Rendezvous”), Enterprise EF78, LLC (the “Mont Belvieu JV”), Texas Express Pipeline LLC (“TEP”), Texas Express Gathering LLC (“TEG”) and Front Range Pipeline LLC (“FRP”). The interests in TEP, TEG and FRP are referred to collectively as the “TEFR Interests.” “Equity investment throughput” refers to our 14.81% share of average Fort Union throughput and our 22% share of average Rendezvous throughput, but excludes throughput measured in barrels consisting of our 10% share of average White Cliffs throughput, our 25% share of average Mont Belvieu JV throughput, our 20% share of average TEP and TEG throughput and our 33.33% share of average FRP throughput. The “DJ Basin complex” refers to the Platte Valley system, Wattenberg system, and Lancaster plant, all of which were combined into a single complex in the first quarter of 2014.

The following discussion analyzes our financial condition and results of operations and should be read in conjunction with the consolidated financial statements and notes to consolidated financial statements, which are included under Part I, Item 1 of this quarterly report, as well as our historical consolidated financial statements, and the notes thereto, which are included in Part II, Item 8 of our 2013 Form 10-K as filed with the Securities and Exchange Commission, or “SEC,” on February 28, 2014, certain sections of which were recast to reflect the results of the TEFR Interests in our Current Report on Form 8-K, as filed with the SEC on August 27, 2014, and our other public filings and press releases.

CAUTIONARY NOTE REGARDING FORWARD-LOOKING STATEMENTS

We have made in this report, and may from time to time otherwise make in other public filings, press releases and discussions by management, forward-looking statements concerning our operations, economic performance and financial condition. These statements can be identified by the use of forward-looking terminology including “may,” “will,” “believe,” “expect,” “anticipate,” “estimate,” “continue,” or other similar words. These statements discuss future expectations, contain projections of results of operations or financial condition or include other “forward-looking” information. Although we believe that the expectations reflected in such forward-looking statements are reasonable, we can give no assurance that such expectations will be realized.

These forward-looking statements involve risks and uncertainties. Important factors that could cause actual results to differ materially from our expectations include, but are not limited to, the following risks and uncertainties:

• our ability to pay distributions to our unitholders;

• our and Anadarko’s assumptions about the energy market;

• future throughput, including Anadarko’s production, which is gathered or processed by or transported through our assets;

• operating results;

• competitive conditions;

• technology;

• availability of capital resources to fund acquisitions, capital expenditures and other contractual obligations, and our ability to access those resources from Anadarko or through the debt or equity capital markets;

• supply of, demand for, and the price of, oil, natural gas, NGLs and related products or services;

22

• weather;

• inflation;

• availability of goods and services;

• general economic conditions, either internationally or domestically or in the jurisdictions in which we are doing business;

• changes in regulations at the federal, state and local level or the inability to timely obtain or maintain permits that could affect our and our customers’ activities; environmental risks; regulations by the Federal Energy Regulatory Commission (“FERC”); and liability under federal and state laws and regulations;

• legislative or regulatory changes, including changes impacting Anadarko and other producers that would limit hydraulic fracturing or other oil and gas operations, and changes affecting our status as a partnership for federal income tax purposes;

• changes in the financial or operational condition of Anadarko;

• changes in Anadarko’s capital program, strategy or desired areas of focus;

• our commitments to capital projects;

• ability to use our revolving credit facility (“RCF”);

• creditworthiness of Anadarko or our other counterparties, including financial institutions, operating partners, and other parties;

• our ability to repay debt;

• our ability to mitigate commodity price risks inherent in our percent-of-proceeds and keep-whole contracts;

• conflicts of interest among us, our general partner, WGP and its general partner, and affiliates, including Anadarko;

• our ability to maintain and/or obtain rights to operate our assets on land owned by third parties;

• our ability to acquire assets on acceptable terms;

• non-payment or non-performance of Anadarko or other significant customers, including under our gathering, processing and transportation agreements and our $260.0 million note receivable from Anadarko;

• timing, amount and terms of future issuances of equity and debt securities; and

• other factors discussed below, in “Risk Factors” included in our 2013 Form 10-K, in “Management’s Discussion and Analysis of Financial Condition and Results of Operations—Critical Accounting Policies and Estimates,” in our quarterly reports on Form 10-Q and elsewhere in our other public filings and press releases.

The risk factors and other factors noted throughout or incorporated by reference in this report could cause our actual results to differ materially from those contained in any forward-looking statement. We undertake no obligation to publicly update or revise any forward-looking statements, whether as a result of new information, future events or otherwise.

23

EXECUTIVE SUMMARY

We are a growth-oriented Delaware master limited partnership formed by Anadarko to own, operate, acquire and develop midstream energy assets. We currently own or have investments in assets located in the Rocky Mountains (Colorado, Utah and Wyoming), the Mid-Continent (Kansas and Oklahoma), north-central Pennsylvania and Texas, and are engaged in the business of gathering, processing, compressing, treating and transporting natural gas, condensate, NGLs and crude oil for Anadarko, as well as for third-party producers and customers. As of September 30, 2014, our assets and investments accounted for under the equity method consisted of the following:

	Owned and Operated	Operated Interests	Non-Operated Interests	Equity Interests
Natural gas gathering systems	13	1	5	2
NGL gathering systems	—	—	—	2
Natural gas treating facilities	8	—	—	1
Natural gas processing facilities	9	3	—	2
NGL pipelines	3	—	—	2
Natural gas pipelines	3	—	—	—
Oil pipeline	—	—	—	1

See also Note 10—Subsequent Event in the Notes to Consolidated Financial Statements under Item 1 of this Form 10-Q.

Significant financial and operational highlights during the first nine months of 2014 included the following:

• We issued 1,133,384 common units to the public under our Continuous Offering Program (as defined below), generating net proceeds of $83.3 million, including the general partner’s proportionate capital contribution to maintain its 2.0% general partner interest. Net proceeds were used for general partnership purposes, including funding capital expenditures. See Equity Offerings below.

• We completed construction and commenced operations in April 2014 of the 300 MMcf/d Train I at the Lancaster processing plant (located in the DJ Basin complex) in Northeast Colorado, and are constructing the 300 MMcf/d Train II at the same plant with operations expected to commence in the second quarter of 2015.

• We issued $400.0 million aggregate principal amount of 5.450% Senior Notes due 2044 and an additional $100.0 million aggregate principal amount of 2.600% Senior Notes due 2018. Net proceeds were used to repay amounts then outstanding under our RCF. See Liquidity and Capital Resources within this Item 2 for additional information.

• We completed the acquisition of Anadarko’s 20% interests in TEG and TEP, and its 33.33% interest in FRP. See Acquisitions below.

• We entered into an amended and restated $1.2 billion (expandable to $1.5 billion) senior unsecured RCF replacing our $800.0 million credit facility. See Liquidity and Capital Resources within this Item 2 for additional information.

• We raised our distribution to $0.675 per unit for the third quarter of 2014, representing a 4%increase over the distribution for the second quarter of 2014 and a 16%increase over the distribution for the third quarter of 2013.

24

• Throughput attributable to Western Gas Partners, LP totaled 3,459 MMcf/d and 3,476 MMcf/d for the three and nine months ended September 30, 2014, respectively, representing a 5% and 12%increase, respectively, compared to the same periods in 2013.

• Adjusted gross margin attributable to Western Gas Partners, LP for natural gas assets (as defined under the caption Key Performance Metrics within this Item 2) averaged $0.67 per Mcf and $0.64 per Mcf for the three and nine months ended September 30, 2014, respectively, representing a 16% and 14%increase, respectively, compared to the same periods in 2013.

• Adjusted gross margin for crude/NGL assets (as defined under the caption Key Performance Metrics within this Item 2) averaged $1.53 per Bbl and $1.71 per Bbl for the three and nine months ended September 30, 2014, respectively, representing a 10% and 20%increase, respectively, compared to the same periods in 2013.

ACQUISITIONS

Acquisitions. The following table presents our acquisitions during 2014 and 2013, and identifies the funding sources for such acquisitions.

thousands except unit and     percent amounts	Acquisition Date	Percentage Acquired		Borrowings		Cash On Hand		Common Units Issued
Non-Operated Marcellus Interest (1)	03/01/2013	33.75	%	$	250,000	$	215,500	449,129
Anadarko-Operated Marcellus Interest (2)	03/08/2013	33.75	%	133,500		—		—
Mont Belvieu JV (3)	06/05/2013	25	%	—		78,129		—
OTTCO (4)	09/03/2013	100	%	27,500		—		—
TEFR Interests (5)	03/03/2014	Various(5)		350,000		6,250		308,490

⁽¹⁾  We acquired Anadarko’s 33.75% interest (non-operated) in the Liberty and Rome gas gathering systems, serving production from the Marcellus shale in north-central Pennsylvania. The interest acquired is referred to as the “Non-Operated Marcellus Interest.” In connection with the issuance of the common units, our general partner purchased 9,166 general partner units for consideration of $0.5 million to maintain its 2.0% general partner interest in us.

⁽²⁾  We acquired a 33.75% interest in each of the Larry’s Creek, Seely and Warrensville gas gathering systems, which are operated by Anadarko and serve production from the Marcellus shale in north-central Pennsylvania, from a third party. The interest acquired is referred to as the “Anadarko-Operated Marcellus Interest.” During the third quarter of 2013, we recorded a $1.1 million decrease in the assets acquired and liabilities assumed in the acquisition, representing the final purchase price allocation.

⁽³⁾  We acquired a 25% interest in the Mont Belvieu JV, an entity formed to design, construct, and own two fractionation trains located in Mont Belvieu, Texas, from a third party. The interest acquired is accounted for under the equity method of accounting.

⁽⁴⁾  We acquired Overland Trail Transmission, LLC (“OTTCO”), a Delaware limited liability company, from a third party. OTTCO owns and operates an intrastate pipeline that connects our Red Desert and Granger complexes in southwestern Wyoming.

⁽⁵⁾  We acquired a 20% interest in each of TEG and TEP and a 33.33% interest in FRP from Anadarko. These assets gather and transport NGLs primarily from the Anadarko and Denver-Julesburg Basins. TEG consists of two NGL gathering systems that link natural gas processing plants to TEP. TEP is an NGL pipeline that originates in Skellytown, Texas and extends approximately 580 miles to Mont Belvieu, Texas. FRP is a 435 mile NGL pipeline that extends from Weld County, Colorado to Skellytown, Texas. The interests in these entities are accounted for under the equity method of accounting. In connection with the issuance of the common units, our general partner purchased 6,296 general partner units for consideration of $0.4 million to maintain its 2.0% general partner interest in us. See Note 2—Acquisitions in the Notes to Consolidated Financial Statements under Item 1 of this Form 10-Q.

25

Presentation of Partnership assets.The “Partnership assets” refer collectively to the assets owned and interests accounted for under the equity method by us as of September 30, 2014. Because Anadarko controls us through its ownership and control of WGP, which owns our general partner, each of our acquisitions of Partnership assets from Anadarko has been considered a transfer of net assets between entities under common control. As such, the Partnership assets we acquired from Anadarko were initially recorded at Anadarko’s historic carrying value, which did not correlate to the total acquisition price paid by us (see Note 2—Acquisitions in the Notes to Consolidated Financial Statements under Item 1 of this Form 10-Q). Further, after an acquisition of the Partnership assets from Anadarko, we may be required to recast our financial statements to include the activities of the Partnership assets as of the date of common control.

The historical financial statements previously filed with the SEC have been recast in this Form 10-Q to include the results attributable to the TEFR Interests for all periods presented. The consolidated financial statements for periods prior to our acquisition of the Partnership assets from Anadarko, including the TEFR Interests, have been prepared from Anadarko’s historical cost-basis accounts and may not necessarily be indicative of the actual results of operations that would have occurred if we had owned the Partnership assets during the periods reported.

EQUITY OFFERINGS

Equity offerings. We completed the following public equity offerings during 2014 and 2013:

thousands except unit and per-unit amounts	Common Units Issued	GP Units Issued(1)	Price Per Unit		Underwriting Discount and Other Offering Expenses		Net Proceeds
May 2013 equity offering (2)	7,015,000	143,163	$	61.18	$	13,203	$	424,733
December 2013 equity offering (3)	4,800,000	97,959	61.51		9,447		291,827
Continuous Offering Program - 2013 (4)	685,735	13,996	60.84		965		41,603
Continuous Offering Program - 2014(5)	1,133,384	23,132	73.48		1,726		83,257

⁽¹⁾  Represents general partner units issued to the general partner in exchange for the general partner’s proportionate capital contribution to maintain its 2.0% general partner interest in us.

⁽²⁾  Includes the issuance of 915,000 common units pursuant to the full exercise of the underwriters’ over-allotment option granted in connection with the May 2013 equity offering.

⁽³⁾  Includes the issuance of 300,000 common units on January 3, 2014, pursuant to the partial exercise of the underwriters’ over-allotment option granted in connection with the December 2013 equity offering. Net proceeds from this partial exercise (including the general partner’s proportionate capital contribution) were $18.1 million.

⁽⁴⁾  Represents common and general partner units issued during the year ended December 31, 2013, pursuant to our registration statement filed with the SEC in August 2012 authorizing the issuance of up to an aggregate of $125.0 million of common units (the “Continuous Offering Program”). Gross proceeds generated (including our general partner’s proportionate capital contributions) were $42.6 million. The price per unit in the table above represents an average price for all issuances under the Continuous Offering Program during 2013.

⁽⁵⁾  Represents common and general partner units issued during the nine months ended September 30, 2014, under the Continuous Offering Program. Gross proceeds generated (including the general partner’s proportionate capital contributions) were $85.0 million. The price per unit in the table above represents an average price for all issuances under the Continuous Offering Program during the nine months ended September 30, 2014. As of September 30, 2014, we had used all the capacity to issue units under this registration statement.

26

RESULTS OF OPERATIONS

OPERATING RESULTS

The following tables and discussion present a summary of our results of operations:

	Three Months Ended   September 30,						Nine Months Ended   September 30,
thousands	2014			2013			2014			2013
Gathering, processing and transportation of natural gas and natural gas liquids	$	168,356		$	130,781		$	471,055		$	343,471
Natural gas, natural gas liquids and condensate sales	150,094			141,326			453,186			402,616
Other, net	8,015			1,395			11,625			4,583
Total revenues(1)	326,465			273,502			935,866			750,670
Equity income, net	19,063			4,520			41,322			11,944
Total operating expenses(1)	222,154			187,813			638,523			538,523
Operating income	123,374			90,209			338,665			224,091
Interest income, net – affiliates	4,225			4,225			12,675			12,675
Interest expense	(20,878		)	(13,018		)	(55,703		)	(37,483		)
Other income (expense), net	97			439			788			1,612
Income before income taxes	106,818			81,855			296,425			200,895
Income tax (benefit) expense	278			(27		)	276			4,192
Net income	106,540			81,882			296,149			196,703
Net income attributable to noncontrolling interest	3,863			3,376			11,005			7,467
Net income attributable to Western Gas Partners, LP	$	102,677		$	78,506		$	285,144		$	189,236
Key performance metrics(2)
Adjusted gross margin attributable to Western Gas Partners, LP	$	233,297		$	179,379		$	659,275		$	483,823
Adjusted EBITDA attributable to Western Gas Partners, LP	167,297			125,176			475,594			328,750
Distributable cash flow	136,722			105,883			392,996			274,795

⁽¹⁾  Revenues include amounts earned from services provided to our affiliates, as well as from the sale of residue, condensate and NGLs to our affiliates. Operating expenses include amounts charged by our affiliates for services as well as reimbursement of amounts paid by affiliates to third parties on our behalf. See Note 5—Transactions with Affiliates in the Notes to Consolidated Financial Statements under Item 1 of this Form 10-Q.

⁽²⁾  Adjusted gross margin attributable to Western Gas Partners, LP, Adjusted EBITDA attributable to Western Gas Partners, LP and Distributable cash flow are defined and reconciled to their most directly comparable financial measures calculated and presented in accordance with Generally Accepted Accounting Principles (“GAAP”) under the caption Key Performance Metrics within this Item 2.

For purposes of the following discussion, any increases or decreases “for the three months ended September 30, 2014” refer to the comparison of the three months ended September 30, 2014, to the three months ended September 30, 2013; any increases or decreases “for the nine months ended September 30, 2014” refer to the comparison of the nine months ended September 30, 2014, to the nine months ended September 30, 2013; and any increases or decreases “for the three and nine months ended September 30, 2014” refer to both the comparisons for the three and nine months ended September 30, 2014.

27

Throughput

	Three Months Ended   September 30,				Nine Months Ended   September 30,
MMcf/d (except throughput measured in barrels)	2014	2013	Inc/ (Dec)		2014	2013	Inc/ (Dec)
Throughput for natural gas assets
Gathering, treating and transportation (1)	1,513	1,439	5	%	1,571	1,354	16	%
Processing (1)	1,936	1,802	7	%	1,903	1,712	11	%
Equity investment (2)	175	221	(21	)%	171	211	(19	)%
Total throughput for natural gas assets	3,624	3,462	5	%	3,645	3,277	11	%
Throughput attributable to noncontrolling interest for natural gas assets	165	177	(7	)%	169	166	2	%
Total throughput attributable to Western Gas Partners, LP for natural gas assets (3)	3,459	3,285	5	%	3,476	3,111	12	%
Total throughput (MBbls/d) for crude/NGL assets (4)	138	31	NM		111	28	NM

NM-Not meaningful

⁽¹⁾  The combination of our Wattenberg and Platte Valley systems in the first quarter of 2014 into the entity now referred to as the “DJ Basin complex” (also includes the Lancaster plant) resulted in the following: (i) the Wattenberg system volumes previously reported as “Gathering, treating and transportation” are now reported as “Processing” for all periods presented, and (ii) beginning with the first quarter of 2014, volumes both gathered and processed by the two systems are no longer separately reported.

⁽²⁾  Represents our 14.81% share of average Fort Union and our 22% share of average Rendezvous throughput. Excludes equity investment throughput measured in barrels (captured in “Total throughput (MBbls/d) for crude/NGL assets” as noted below).

⁽³⁾  Includes affiliate, third-party and equity investment throughput (as equity investment throughput is defined in the above footnote), excluding the noncontrolling interest owner’s proportionate share of throughput.

⁽⁴⁾  Represents total throughput measured in barrels consisting of throughput from our Chipeta NGL pipeline, our 10% share of average White Cliffs throughput, our 25% share of average Mont Belvieu JV throughput, our 20% share of average TEG and TEP throughput and our 33.33% share of average FRP throughput.

Gathering, treating and transportation throughput increased by 74 MMcf/d for the three months ended September 30, 2014, due to increased throughput from the Non-Operated Marcellus Interest as a result of additional well connections, partially offset by decreased throughput at Bison due to a period of reduced flow resulting from planned maintenance activity. Gathering, treating and transportation throughput increased by 217 MMcf/d for the nine months ended September 30, 2014, due to increased throughput from the Non-Operated Marcellus Interest as a result of additional well connections and additional throughput from the Anadarko-Operated Marcellus Interest after the March 2013 acquisition, partially offset by throughput decreases at Bison due to the aforementioned maintenance activity and decreases at the Pinnacle and Dew systems resulting from natural production declines in those areas.

Processing throughput increased by 134 MMcf/d for the three months ended September 30, 2014, primarily due to the start-up of the Brasada facility in June 2013, increased volumes processed at a plant included in the MGR acquisition (the “Granger straddle plant”) and the start-up of the Lancaster plant in April 2014, partially offset by throughput decreases at Chipeta and the Red Desert complex. Processing throughput increased by 191 MMcf/d for the nine months ended September 30, 2014, primarily due to the start-up of the Brasada facility in June 2013, increased volumes processed at the Granger straddle plant and throughput growth at Chipeta, partially offset by throughput declines at the Granger complex.

Equity investment throughput decreased by 46 MMcf/d and 40 MMcf/d for the three and nine months ended September 30, 2014, respectively, primarily due to lower throughput at the Fort Union system due to production declines in the area and volumes being diverted to the third-party Bison pipeline.

Throughput for crude/NGL assets measured in barrels increased by 107 MBbls/d and 83 MBbls/d for the three and nine months ended September 30, 2014, respectively, due to the start-up of (i) the Mont Belvieu JV fractionation trains in the fourth quarter 2013, (ii) TEP and TEG in fourth quarter 2013, and (iii) FRP in March 2014.

28

Gathering, Processing and Transportation of Natural Gas and Natural Gas Liquids

	Three Months Ended   September 30,						Nine Months Ended   September 30,
thousands except percentages	2014		2013		Inc/ (Dec)		2014		2013		Inc/ (Dec)
Gathering, processing and transportation of natural gas and natural gas liquids	$	168,356	$	130,781	29	%	$	471,055	$	343,471	37	%

Revenues from gathering, processing and transportation of natural gas and natural gas liquids increased by $37.6 million and $127.6 million for the three and nine months ended September 30, 2014, respectively, primarily due to increases of (i) $20.5 million and $44.5 million, respectively, resulting from increased throughput at the DJ Basin complex and the start-up of the Lancaster plant in April 2014, (ii) $5.7 million and $27.3 million, respectively, due to the start-up of the Brasada facility in June 2013, (iii) $5.7 million and $25.5 million, respectively, at the Non-Operated Marcellus Interest due to higher throughput and average gathering rate, (iv) $2.7 million and $3.4 million, respectively, due to new third-party gathering agreements at Hilight, and (v) $1.7 million and $11.7 million, respectively, due to increased throughput at Chipeta’s Train III, as well as the retroactive application of a fee increase in the third quarter of 2014 that was applicable upon Train III being placed into service. In addition, higher throughput at the Anadarko-Operated Marcellus Interest, acquired in March 2013, contributed $13.0 million to the increase for the nine months ended September 30, 2014.

Natural Gas, Natural Gas Liquids and Condensate Sales

	Three Months Ended   September 30,						Nine Months Ended   September 30,
thousands except percentages and per-unit amounts	2014		2013		Inc/ (Dec)		2014		2013		Inc/ (Dec)
Natural gas sales	$	41,386	$	30,034	38	%	$	109,349	$	85,025	29	%
Natural gas liquids sales	97,972		104,535		(6	)%	312,426		294,133		6	%
Drip condensate sales	10,736		6,757		59	%	31,411		23,458		34	%
Total	$	150,094	$	141,326	6	%	$	453,186	$	402,616	13	%
Average price per unit:
Natural gas (per Mcf)	$	3.96	$	5.06	(22	)%	$	4.17	$	4.53	(8	)%
Natural gas liquids (per Bbl)	42.17		48.09		(12	)%	45.02		47.65		(6	)%
Drip condensate (per Bbl)	79.93		76.69		4	%	82.19		76.18		8	%

For thethree and nine months ended September 30, 2014and2013, average natural gas, NGL and drip condensate prices include the effects of commodity price swap agreements attributable to sales for the DJ Basin complex, and the Granger, Hilight, Hugoton, Newcastle, and MGR assets. See Note 5—Transactions with Affiliates in the Notes to Consolidated Financial Statements under Item 1 of this Form 10-Q.

Including the effects of commodity price swap agreements, total natural gas, natural gas liquids and condensate sales increased by $8.8 million for the three months ended September 30, 2014, consisting of an $11.4 million increase in sales of natural gas and a $4.0 million increase in drip condensate sales, partially offset by a $6.6 million decrease in NGLs sales.

The growth in natural gas sales for the three months ended September 30, 2014, was primarily due to increases of $7.5 million and $3.5 million at the DJ Basin complex and the Hilight system, respectively, due to increased sales volumes.

The decline in NGLs sales for the three months ended September 30, 2014, was primarily due to decreases of $6.0 million and $2.2 million at the Red Desert complex and the Granger Straddle plant, respectively, due to lower volumes sold and a decrease in average swap price. These decreases were partially offset by an increase of $1.8 million at Hilight due to increased sales volumes, partially offset by a decrease in average swap price.

The increase in drip condensate sales for the three months ended September 30, 2014, was primarily due to an increase of $4.2 million at the DJ Basin complex, resulting from an increase in drip condensate volumes sold and average swap price, partially offset by a decrease at Hugoton of $0.2 million due to a decrease in drip condensate volumes sold.

29

Including the effects of commodity price swap agreements, total natural gas, natural gas liquids and condensate sales increased by $50.6 million for the nine months ended September 30, 2014, consisting of $24.3 million in sales of natural gas, $18.3 million in NGLs sales and $8.0 million in drip condensate sales.

The growth in natural gas sales for the nine months ended September 30, 2014, was primarily due to increases of (i) $12.0 million at the Hilight system due to an increase in volumes sold, partially offset by a decrease in average swap price, (ii) $9.0 million at the DJ Basin complex due to an increase in both volumes sold and average swap prices, and (iii) $3.8 million at the Red Desert complex due to an increase in volumes sold.

The growth in NGLs sales for the nine months ended September 30, 2014, was primarily due to increases of (i) $16.0 million at the DJ Basin complex due to increases in both volumes sold and average swap price, (ii) $7.8 million at Chipeta due to an increase in volumes sold and (iii) $6.4 million at the Hilight system due to higher volumes processed and sold, partially offset by a decrease in average swap price. These increases were partially offset by a $9.5 million decrease at the Red Desert complex due to a decrease in volumes sold and average swap prices.

The increase in drip condensate sales for the nine months ended September 30, 2014, was primarily due to an increase of $9.1 million at the DJ Basin complex from an increase in drip condensate volumes sold and average swap price, partially offset by a decrease of $1.2 million at Hugoton due to a decrease in drip condensate volumes sold.

Equity Income, Net

	Three Months Ended   September 30,					Nine Months Ended   September 30,
thousands except percentages	2014		2013		Inc/ (Dec)	2014		2013		Inc/ (Dec)
Equity income, net	$	19,063	$	4,520	NM	$	41,322	$	11,944	NM

For the three and nine months ended September 30, 2014, equity income, net increased by $14.5 million and $29.4 million, respectively, primarily driven by the start-up of (i) the Mont Belvieu JV fractionation trains in the fourth quarter 2013, (ii) TEG and TEP in the fourth quarter 2013 and (iii) FRP in March 2014.

Cost of Product and Operation and Maintenance Expenses

	Three Months Ended   September 30,						Nine Months Ended   September 30,
thousands except percentages	2014		2013		Inc/ (Dec)		2014		2013		Inc/ (Dec)
NGL purchases	$	60,886	$	50,684	20	%	$	164,302	$	144,293	14	%
Residue purchases	38,779		38,919		—	%	126,731		114,856		10	%
Other	8,728		3,913		123	%	27,395		10,910		151	%
Cost of product	108,393		93,516		16	%	318,428		270,059		18	%
Operation and maintenance	53,657		42,757		25	%	145,064		121,165		20	%
Total cost of product and operation and maintenance expenses	$	162,050	$	136,273	19	%	$	463,492	$	391,224	18	%

Cost of product expense for the three and nine months ended September 30, 2014 and 2013, includes the effects of commodity price swap agreements attributable to purchases for the Granger, Hilight, Hugoton, Newcastle and MGR assets, as well as the DJ Basin complex. See Note 5—Transactions with Affiliates in the Notes to Consolidated Financial Statements under Item 1 of this Form 10-Q.

Including the effects of commodity price swap agreements on purchases, cost of product expense for the three months ended September 30, 2014, increased by $14.9 million primarily due to the volume fluctuations noted in Throughput and Natural Gas, Natural Gas Liquids and Condensate Sales within this Item 2, resulting in the following:

• a $10.2 million net increase in NGL purchases primarily at the DJ Basin complex, Hilight system and Chipeta, partially offset by a decrease at the Red Desert complex;

30

• a $0.1 million net decrease in residue purchases, primarily driven by lower prices offset by higher volumes at the DJ Basin complex and the Hilight system; and

• a $4.8 million net increase in other items, primarily due to changes in imbalance positions at the DJ Basin complex.

Including the effects of commodity price swap agreements on purchases, cost of product expense for the nine months ended September 30, 2014, increased by $48.4 million primarily due to the volume fluctuations noted in Throughput and Natural Gas, Natural Gas Liquids and Condensate Sales within this Item 2, resulting in the following:

• a $20.0 million net increase in NGL purchases primarily at the DJ Basin complex, the Hilight system and Chipeta, partially offset by a decrease at the Red Desert complex;

• an $11.9 million net increase in residue purchases primarily at the Hilight system, the Granger straddle plant and Chipeta, partially offset by a decrease at the Granger complex; and

• a $16.5 million net increase in other items, primarily due to changes in imbalance positions at the DJ Basin complex and the Hilight system.

Operation and maintenance expense increased by $10.9 million for the three months ended September 30, 2014, primarily due to an increase of $3.8 million for plant repairs and maintenance primarily at the Bison facility, DJ Basin complex and the Brasada facility, an increase of $3.3 million attributable to the Non-Operated Marcellus Interest and an increase of $2.1 million in utilities, contract labor and consulting, and water costs primarily at the DJ Basin complex.

Operation and maintenance expense increased by $23.9 million for the nine months ended September 30, 2014, primarily due to an increase of $10.3 million for plant repairs and maintenance primarily at the Hilight system, DJ Basin complex and the Brasada facility, an increase of $7.0 million attributable to the Non-Operated Marcellus Interest and an increase of $4.1 million in utilities, chemicals and water costs primarily attributable to the DJ Basin complex.

General and Administrative, Depreciation and Other Expenses

	Three Months Ended   September 30,						Nine Months Ended   September 30,
thousands except percentages	2014		2013		Inc/ (Dec)		2014		2013		Inc/ (Dec)
General and administrative	$	7,889	$	7,276	8	%	$	24,304	$	22,228	9	%
Property and other taxes	6,564		6,649		(1	)%	20,718		18,520		12	%
Depreciation, amortization and impairments	45,651		37,615		21	%	130,009		106,551		22	%
Total general and administrative, depreciation and other expenses	$	60,104	$	51,540	17	%	$	175,031	$	147,299	19	%

General and administrative expenses increased by $0.6 million and $2.1 million for the three and nine months ended September 30, 2014, respectively, primarily due to an increase of $0.7 million and $2.1 million, respectively, in personnel costs for which we reimbursed Anadarko pursuant to our omnibus agreement, and an increase of $0.1 million and $0.6 million, respectively, in non-cash compensation expenses. These increases were offset by decreases of $0.2 million and $0.6 million, respectively, in legal, consulting and audit fees.

Property and other taxes decreased by $0.1 million for the three months ended September 30, 2014, primarily due to decreases in ad valorem taxes at the Brasada facility, Hugoton and Hilight system, which were offset by increases at the DJ Basin complex and Chipeta.

Property and other taxes increased by $2.2 million for the nine months ended September 30, 2014, primarily due to ad valorem tax increases of $2.6 million associated with the start-up of Train I at the Lancaster plant in April 2014 and compression expansion capital projects at the DJ Basin complex and the completion of the Brasada facility in June 2013 and $0.5 million at Chipeta, these increases were offset by a decrease of $0.9 million in accrued ad valorem taxes at the Hilight system, Hugoton, Helper and Pinnacle gathering systems.

31

Depreciation, amortization and impairments increased by $8.0 million for the three months ended September 30, 2014, primarily attributable to a $5.1 million increase in depreciation expense associated with the start-up of Train I at the Lancaster plant in April 2014 and compression expansion capital projects at the DJ Basin complex, a $0.8 million increase in depreciation expense at the Non-Operated Marcellus Interest driven by additional capital projects, a $0.7 million increase in depreciation expense related to the September 2013 acquisition of OTTCO, and a $0.9 million impairment related to a compressor no longer in service at the Hilight system and the cancellation of various capital projects by the third-party operator of the Non-Operated Marcellus Interest.

Depreciation, amortization and impairments increased by $23.5 million for the nine months ended September 30, 2014, primarily attributable to a $10.7 million increase in depreciation expense associated with the start-up of Train I at the Lancaster plant in April 2014 and compression expansion capital projects at the DJ Basin complex, a $3.8 million increase in depreciation expense due to the completion of the Brasada facility in June 2013, a $3.4 million increase at the Marcellus Non-Operated Interest driven by additional capital projects, a $2.3 million increase in depreciation expense related to the September 2013 acquisition of OTTCO, a $1.5 million and $1.1 million increase in depreciation expense at the Hilight system and the Anadarko-Operated Marcellus Interest, respectively, related to capital projects, and an impairment of $1.0 million in the first quarter of 2014 related to a non-operational plant in the Powder River Basin with no comparative activity in the prior period. In addition, during the nine months ended September 30, 2014, impairment expense of $0.5 million was recognized related to a compressor no longer in service at the Hilight system and $0.8 million related to the cancellation of various capital projects by the third-party operator of the Non-Operated Marcellus Interest.

Interest Income, Net – Affiliates and Interest Expense

	Three Months Ended   September 30,								Nine Months Ended   September 30,
thousands except percentages	2014			2013			Inc/ (Dec)		2014			2013			Inc/ (Dec)
Interest income on note receivable	$	4,225		$	4,225		—	%	$	12,675		$	12,675		—	%
Interest income, net – affiliates	$	4,225		$	4,225		—	%	$	12,675		$	12,675		—	%
Interest expense on long-term debt	$	(21,671	)	$	(14,994	)	45	%	$	(59,251	)	$	(43,783	)	35	%
Amortization of debt issuance costs and commitment fees	(1,107		)	(1,135		)	(2	)%	(3,799		)	(3,252		)	17	%
Capitalized interest	1,900			3,111			(39	)%	7,347			9,552			(23	)%
Interest expense	$	(20,878	)	$	(13,018	)	60	%	$	(55,703	)	$	(37,483	)	49	%

Interest expense increased by $7.9 million and $18.2 million for the three and nine months ended September 30, 2014, respectively, primarily due to interest expense incurred on the 5.450% Senior Notes due 2044 of $5.5 million and $11.6 million, respectively, as well as interest incurred on the 2.600% Senior Notes due 2018 of $1.4 million and $5.4 million, respectively. Amortization of debt issuance costs and commitment fees increased by $0.5 million for the nine months ended September 30, 2014 primarily due to the issuance of the 2.600% Senior Notes due 2018. These increases were partially offset by a decrease in interest expense on the RCF of $0.2 million and $1.5 million for the three and nine months ended September 30, 2014, respectively, due to lower average outstanding borrowings in the current period. Capitalized interest decreased by $1.2 million and $2.2 million for the three and nine months ended September 30, 2014, respectively, primarily due to the completion of the Brasada facility during 2013, partially offset by an increase in capitalized interest for the construction of Train II at the Lancaster processing plant. See Note 8—Debt and Interest Expense in the Notes to Consolidated Financial Statements under Item 1 of this Form 10-Q.

32

Income Tax (Benefit) Expense

	Three Months Ended   September 30,								Nine Months Ended   September 30,
thousands except percentages	2014			2013			Inc/ (Dec)		2014			2013			Inc/ (Dec)
Income before income taxes	$	106,818		$	81,855		30	%	$	296,425		$	200,895		48	%
Income tax (benefit) expense	278			(27		)	NM		276			4,192			(93	)%
Effective tax rate	—		%	—		%			—		%	2		%

We are not a taxable entity for U.S. federal income tax purposes; however, income apportionable to Texas is subject to Texas margin tax. For the periods presented, our variance from the federal statutory rate, which is zero percent as a non-taxable entity, is primarily due to federal and state taxes on pre-acquisition income attributable to Partnership assets acquired from Anadarko, and our share of Texas margin tax.

Income attributable to (a) the TEFR Interests prior to and including February 2014 and (b) the Non-Operated Marcellus Interest prior to and including February 2013 was subject to federal and state income tax. Income earned on the TEFR Interests and the Non-Operated Marcellus Interest for periods subsequent to February 2014 and February 2013, respectively, was only subject to Texas margin tax on income apportionable to Texas.

Noncontrolling Interest

	Three Months Ended   September 30,						Nine Months Ended   September 30,
thousands except percentages	2014		2013		Inc/ (Dec)		2014		2013		Inc/ (Dec)
Net income attributable to noncontrolling interest	$	3,863	$	3,376	14	%	$	11,005	$	7,467	47	%

For the three and nine months ended September 30, 2014, net income attributable to noncontrolling interest increased by $0.5 million and $3.5 million, respectively, primarily due to increased revenues at Chipeta driven by increased drilling activities in the Uintah Basin.

33

KEY PERFORMANCE METRICS

	Three Months Ended   September 30,						Nine Months Ended   September 30,
thousands except percentages and per-unit amounts	2014		2013		Inc/ (Dec)		2014		2013		Inc/ (Dec)
Adjusted gross margin attributable to Western Gas Partners, LP for natural gas assets (1)	$	213,901	$	175,348	22	%	$	607,583	$	472,827	29	%
Adjusted gross margin for crude/NGL assets (2)	19,396		4,031		NM		51,692		10,996		NM
Adjusted gross margin attributable to Western Gas Partners, LP	233,297		179,379		30	%	659,275		483,823		36	%
Adjusted gross margin per Mcf attributable to Western Gas Partners, LP for natural gas assets (3)	0.67		0.58		16	%	0.64		0.56		14	%
Adjusted gross margin per Bbl for crude/NGL assets (4)	1.53		1.39		10	%	1.71		1.43		20	%
Adjusted EBITDA attributable to Western Gas Partners, LP (5)	167,297		125,176		34	%	475,594		328,750		45	%
Distributable cash flow (5)	136,722		105,883		29	%	392,996		274,795		43	%

⁽¹⁾  Adjusted gross margin attributable to Western Gas Partners, LP for natural gas assets is calculated as total revenues for natural gas assets less cost of product for natural gas assets plus distributions from our equity investments in Fort Union and Rendezvous, which are measured in Mcf, and excluding the noncontrolling interest owner’s proportionate share of revenue and cost of product. See the reconciliation of Adjusted gross margin attributable to Western Gas Partners, LP for natural gas assets to its most comparable GAAP measure below.

⁽²⁾  Adjusted gross margin for crude/NGL assets is calculated as total revenues for crude/NGL assets less cost of product for crude/NGL assets plus distributions from our equity investments in White Cliffs, the Mont Belvieu JV, TEG, TEP and FRP, which are measured in barrels. See the reconciliation of Adjusted gross margin for crude/NGL assets to its most comparable GAAP measure below.

⁽³⁾  Average for period. Calculated as Adjusted gross margin attributable to Western Gas Partners, LP for natural gas assets, divided by total throughput (MMcf/d) attributable to Western Gas Partners, LP for natural gas assets.

⁽⁴⁾  Average for period. Calculated as Adjusted gross margin for crude/NGL assets, divided by total throughput (MBbls/d) for crude/NGL assets.

⁽⁵⁾  For reconciliations of Adjusted EBITDA attributable to Western Gas Partners, LP and Distributable cash flow to their most directly comparable financial measures calculated and presented in accordance with GAAP, see the descriptions below.

Adjusted gross margin attributable to Western Gas Partners, LP . We define Adjusted gross margin attributable to Western Gas Partners, LP (“Adjusted gross margin”) as total revenues less cost of product, plus distributions from equity investees and excluding the noncontrolling interest owner’s proportionate share of revenue and cost of product. We believe Adjusted gross margin is an important performance measure of the core profitability of our operations, as well as our operating performance as compared to that of other companies in our industry.

Adjusted gross margin increased by $53.9 million and $175.5 million for the three and nine months ended September 30, 2014, respectively, primarily due to higher margins at the DJ Basin complex (including the start-up of the Lancaster plant in April 2014), the start-up of the Brasada facility in June 2013, higher margins on the Non-Operated Marcellus Interest, the fourth quarter 2013 start-up of the Mont Belvieu fractionation trains, the fourth quarter 2013 start-up of TEG and TEP, and the March 2014 start-up of FRP. In addition, for the nine months ended September 30, 2014, higher margins on Chipeta contributed to the increase.

To facilitate investor and industry analyst comparisons between us and our peers, we also disclose Adjusted gross margin per Mcf attributable to Western Gas Partners, LP for natural gas assets and Adjusted gross margin per Bbl for crude/NGL assets. Adjusted gross margin per Mcf attributable to Western Gas Partners, LP for natural gas assets increased by $0.09 and $0.08 for the three and nine months ended September 30, 2014, respectively, primarily due to the consolidation of several systems into the DJ Basin complex beginning in the first quarter of 2014, as well as the start-up of the Lancaster plant in April 2014, and higher margins at Chipeta and the Non-Operated Marcellus Interest, partially offset by margin declines at the Red Desert complex. Adjusted gross margin per Bbl for crude/NGL assets increased by $0.14 and $0.28 for the three and nine months ended September 30, 2014, respectively, due to distributions received from the Mont Belvieu JV and the TEFR Interests.

34

Adjusted EBITDA attributable to Western Gas Partners, LP. We define Adjusted EBITDA attributable to Western Gas Partners, LP (“Adjusted EBITDA”) as net income attributable to Western Gas Partners, LP, plus distributions from equity investees, non-cash equity-based compensation expense, interest expense, income tax expense, depreciation, amortization and impairments, and other expense, less income from equity investments, interest income, income tax benefit, and other income. We believe that the presentation of Adjusted EBITDA provides information useful to investors in assessing our financial condition and results of operations and that Adjusted EBITDA is a widely accepted financial indicator of a company’s ability to incur and service debt, fund capital expenditures and make distributions. Adjusted EBITDA is a supplemental financial measure that management and external users of our consolidated financial statements, such as industry analysts, investors, commercial banks and rating agencies, use to assess the following, among other measures:

• our operating performance as compared to other publicly traded partnerships in the midstream energy industry, without regard to financing methods, capital structure or historical cost basis;

• the ability of our assets to generate cash flow to make distributions; and

• the viability of acquisitions and capital expenditure projects and the returns on investment of various investment opportunities.

Adjusted EBITDA increased by $42.1 million for the three months ended September 30, 2014, primarily due to a $53.0 millionincrease in total revenues and a $16.3 millionincrease in distributions from equity investees. These amounts were offset by a $14.9 millionincrease in cost of product, a $10.9 millionincrease in operation and maintenance expenses, a $0.5 million increase in general and administrative expenses excluding non-cash equity-based compensation expense, and a $0.5 millionincrease in net income attributable to noncontrolling interest.

Adjusted EBITDA increased by $146.8 million for the nine months ended September 30, 2014, primarily due to a $185.2 millionincrease in total revenues and a $41.9 millionincrease in distributions from equity investees. These amounts were offset by a $48.4 millionincrease in cost of product, a $23.9 millionincrease in operation and maintenance expenses, a $3.5 millionincrease in net income attributable to noncontrolling interest, a $2.2 millionincrease in property and other tax expense, and a $1.6 million increase in general and administrative expenses excluding non-cash equity-based compensation expense.

Distributable cash flow. We define “Distributable cash flow” as Adjusted EBITDA, plus interest income, less net cash paid for interest expense (including amortization of deferred debt issuance costs originally paid in cash, offset by non-cash capitalized interest), maintenance capital expenditures, and income taxes. We compare Distributable cash flow to the cash distributions we expect to pay our unitholders. Using this measure, management can quickly compute the Coverage ratio of distributable cash flow to planned cash distributions. We believe Distributable cash flow is useful to investors because this measurement is used by many companies, analysts and others in the industry as a performance measurement tool to evaluate our operating and financial performance and compare it with the performance of other publicly traded partnerships.

While Distributable cash flow is a measure we use to assess our ability to make distributions to our unitholders, it should not be viewed as indicative of the actual amount of cash that we have available for distributions or that we plan to distribute for a given period.

Distributable cash flow increased by $30.8 million for the three months ended September 30, 2014, primarily due to a $42.1 millionincrease in Adjusted EBITDA, offset by a $6.6 millionincrease in net cash paid for interest expense and a $4.6 millionincrease in cash paid for maintenance capital expenditures.

Distributable cash flow increased by $118.2 million for the nine months ended September 30, 2014, primarily due to a $146.8 millionincrease in Adjusted EBITDA, offset by a $16.0 millionincrease in net cash paid for interest expense and a $13.0 millionincrease in cash paid for maintenance capital expenditures.

35

Reconciliation to GAAP measures. Adjusted gross margin, Adjusted EBITDA and Distributable cash flow are not defined in GAAP. The GAAP measure used by us that is most directly comparable to Adjusted gross margin is operating income, while net income attributable to Western Gas Partners, LP and net cash provided by operating activities are the GAAP measures used by us that are most directly comparable to Adjusted EBITDA. The GAAP measure used by us that is most directly comparable to Distributable cash flow is net income attributable to Western Gas Partners, LP. Our non-GAAP financial measures of Adjusted gross margin, Adjusted EBITDA and Distributable cash flow should not be considered as alternatives to the GAAP measures of operating income, net income attributable to Western Gas Partners, LP, net cash provided by operating activities or any other measure of financial performance presented in accordance with GAAP. Adjusted gross margin, Adjusted EBITDA and Distributable cash flow have important limitations as analytical tools because they exclude some, but not all, items that affect operating income, net income and net cash provided by operating activities. Adjusted gross margin, Adjusted EBITDA and Distributable cash flow should not be considered in isolation or as a substitute for analysis of our results as reported under GAAP. Our definitions of Adjusted gross margin, Adjusted EBITDA and Distributable cash flow may not be comparable to similarly titled measures of other companies in our industry, thereby diminishing their utility.

Management compensates for the limitations of Adjusted gross margin, Adjusted EBITDA and Distributable cash flow as analytical tools by reviewing the comparable GAAP measures, understanding the differences between Adjusted gross margin, Adjusted EBITDA and Distributable cash flow compared to (as applicable) operating income, net income and net cash provided by operating activities, and incorporating this knowledge into its decision-making processes. We believe that investors benefit from having access to the same financial measures that our management uses in evaluating our operating results.

The following tables present (a) a reconciliation of the non-GAAP financial measure of Adjusted gross margin to the GAAP measure of operating income, (b) a reconciliation of the non-GAAP financial measure of Adjusted EBITDA to the GAAP financial measures of net income attributable to Western Gas Partners, LP and net cash provided by operating activities, and (c) a reconciliation of the non-GAAP financial measure of Distributable cash flow to the GAAP financial measure of net income attributable to Western Gas Partners, LP:

	Three Months Ended   September 30,				Nine Months Ended   September 30,
thousands	2014		2013		2014		2013
Reconciliation of Adjusted gross margin attributable to Western Gas Partners, LP to Operating income
Adjusted gross margin attributable to Western Gas Partners, LP for natural gas assets	$	213,901	$	175,348	$	607,583	$	472,827
Adjusted gross margin for crude/NGL assets	19,396		4,031		51,692		10,996
Adjusted gross margin attributable to Western Gas Partners, LP	233,297		179,379		659,275		483,823
Adjusted gross margin attributable to noncontrolling interest	5,582		5,138		15,611		12,351
Equity income, net	19,063		4,520		41,322		11,944
Less:
Distributions from equity investees	20,807		4,531		57,448		15,563
Operation and maintenance	53,657		42,757		145,064		121,165
General and administrative	7,889		7,276		24,304		22,228
Property and other taxes	6,564		6,649		20,718		18,520
Depreciation, amortization and impairments	45,651		37,615		130,009		106,551
Operating income	$	123,374	$	90,209	$	338,665	$	224,091

36

	Three Months Ended   September 30,						Nine Months Ended   September 30,
thousands	2014			2013			2014			2013
Reconciliation of Adjusted EBITDA attributable to Western Gas Partners, LP to Net income attributable to Western Gas Partners, LP
Adjusted EBITDA attributable to Western Gas Partners, LP	$	167,297		$	125,176		$	475,594		$	328,750
Less:
Distributions from equity investees	20,807			4,531			57,448			15,563
Non-cash equity-based compensation expense	1,034			962			3,188			2,663
Interest expense	20,878			13,018			55,703			37,483
Income tax expense	278			—			504			4,219
Depreciation, amortization and impairments (1)	45,005			36,970			128,083			104,651
Add:
Equity income, net	19,063			4,520			41,322			11,944
Interest income, net – affiliates	4,225			4,225			12,675			12,675
Other income (1) (2)	94			39			251			419
Income tax benefit	—			27			228			27
Net income attributable to Western Gas Partners, LP	$	102,677		$	78,506		$	285,144		$	189,236
Reconciliation of Adjusted EBITDA attributable to Western Gas Partners, LP to Net cash provided by operating activities
Adjusted EBITDA attributable to Western Gas Partners, LP	$	167,297		$	125,176		$	475,594		$	328,750
Adjusted EBITDA attributable to noncontrolling interest	4,506			4,017			12,922			9,362
Interest income (expense), net	(16,653		)	(8,793		)	(43,028		)	(24,808		)
Non-cash equity-based compensation expense	(11		)	(80		)	22			(99		)
Debt-related amortization and other items, net	687			630			2,045			1,756
Current income tax benefit (expense)	(99		)	9,888			366			25,024
Other income (expense), net (2)	97			43			260			424
Distributions from equity investments in excess of cumulative earnings	(4,539		)	—			(14,387		)	—
Changes in operating working capital:
Accounts receivable, net	(18,055		)	(580		)	(41,408		)	(27,387		)
Accounts and natural gas imbalance payables and accrued liabilities, net	8,942			6,482			9,736			6,818
Other	(2,602		)	(2,758		)	1,645			(2,523		)
Net cash provided by operating activities	$	139,570		$	134,025		$	403,767		$	317,317
Cash flow information of Western Gas Partners, LP
Net cash provided by operating activities							$	403,767		$	317,317
Net cash used in investing activities							(913,372		)	(1,432,048		)
Net cash provided by financing activities							476,714			733,114

⁽¹⁾  Includes our 75% share of depreciation, amortization and impairments, and other income attributable to Chipeta.

⁽²⁾  Excludes income of zero and $0.4 million for the three months ended September 30, 2014 and 2013, respectively, and $0.5 million and $1.2 million for the nine months ended September 30, 2014 and 2013, respectively, related to a component of a gas processing agreement accounted for as a capital lease.

37

	Three Months Ended   September 30,						Nine Months Ended   September 30,
thousands except Coverage ratio	2014			2013			2014				2013
Reconciliation of Distributable cash flow to Net income attributable to Western Gas Partners, LP and calculation of the Coverage ratio
Distributable cash flow	$	136,722		$	105,883		$	392,996			$	274,795
Less:
Distributions from equity investees	20,807			4,531			57,448				15,563
Non-cash equity-based compensation expense	1,035			962			3,188				2,663
Income tax (benefit) expense	278			(27		)	276				4,192
Depreciation, amortization and impairments (1)	45,005			36,970			128,083				104,651
Add:
Equity income, net	19,063			4,520			41,322				11,944
Cash paid for maintenance capital expenditures (1)	12,023			7,389			32,563				19,595
Capitalized interest (2)	1,900			3,111			7,347				9,552
Cash paid for (reimbursement of) income taxes	—			—			(340		)		—
Other income (1) (3)	94			39			251				419
Net income attributable to Western Gas Partners, LP	$	102,677		$	78,506		$	285,144			$	189,236
Distributions declared(4)
Limited partners	$	80,373					$	231,476
General partner	31,236						84,537
Total	$	111,609					$	316,013
Coverage ratio	1.23		x				1.24			x

⁽¹⁾  Includes our 75% share of depreciation, amortization and impairments; cash paid for maintenance capital expenditures; and other income attributable to Chipeta.

⁽²⁾  Includes capitalized interest of $1.1 million and $1.5 million for the three and nine months ended September 30, 2013, respectively, for the construction of the Mont Belvieu JV, reflected as a component of the equity investment balance.

⁽³⁾  Excludes income of zero and $0.4 million for the three months ended September 30, 2014 and 2013, respectively, and $0.5 million and $1.2 million for the nine months ended September 30, 2014 and 2013, respectively, related to a component of a gas processing agreement accounted for as a capital lease.

⁽⁴⁾  Reflects distributions of $0.675 and $1.95 per unit declared for the three and nine months ended September 30, 2014, respectively.

LIQUIDITY AND CAPITAL RESOURCES

Our primary cash requirements are for acquisitions and capital expenditures, debt service, customary operating expenses, quarterly distributions to our limited partners and general partner, and distributions to our noncontrolling interest owner. Our sources of liquidity as of September 30, 2014, included cash and cash equivalents, cash flows generated from operations, interest income on our $260.0 million note receivable from Anadarko, available borrowing capacity under our RCF, and issuances of additional equity or debt securities. We believe that cash flows generated from these sources will be sufficient to satisfy our short-term working capital requirements and long-term maintenance and expansion capital expenditure requirements. The amount of future distributions to unitholders will depend on our results of operations, financial condition, capital requirements and other factors, and will be determined by the board of directors of our general partner on a quarterly basis. Due to our cash distribution policy, we expect to rely on external financing sources, including equity and debt issuances, to fund expansion capital expenditures and future acquisitions. However, to limit interest expense, we may use operating cash flows to fund expansion capital expenditures or acquisitions, which could result in subsequent borrowings under our RCF to pay distributions or fund other short-term working capital requirements.

38

Our partnership agreement requires that we distribute all of our available cash (as defined in the partnership agreement) to unitholders of record on the applicable record date within 45 days of the end of each quarter. We have made cash distributions to our unitholders each quarter since our initial public offering and have increased our quarterly distribution each quarter since the second quarter of 2009. On October 20, 2014, the board of directors of our general partner declared a cash distribution to our unitholders of $0.675 per unit, or $111.6 million in aggregate, including incentive distributions. The cash distribution is payable on November 13, 2014, to unitholders of record at the close of business on October 31, 2014.

Management continuously monitors our leverage position and coordinates our capital expenditure program, quarterly distributions and acquisition strategy with our expected cash flows and projected debt-repayment schedule. We will continue to evaluate funding alternatives, including additional borrowings and the issuance of debt or equity securities, to secure funds as needed or to refinance outstanding debt balances with longer-term notes. To facilitate a potential debt or equity securities issuance, we have the ability to sell securities under our shelf registration statements. Our ability to generate cash flows is subject to a number of factors, some of which are beyond our control. Please read Part II, Item 1A—Risk Factors of this Form 10-Q.

Working capital. As of September 30, 2014, we had $0.3 million of working capital deficit, which we define as the amount by which current liabilities exceed current assets. Working capital is an indication of our liquidity and potential need for short-term funding. Our working capital requirements are driven by changes in accounts receivable and accounts payable and factors such as credit extended to, and the timing of collections from, our customers, and the level and timing of our spending for maintenance and expansion activity. Our working capital deficit as of September 30, 2014, is primarily due to the costs incurred related to projects at the DJ Basin complex, which include the continued construction of a second train and compressor expansions. As of September 30, 2014, we had $1.0 billion available for borrowing under our RCF. See Note 8—Debt and Interest Expense and Note 10—Subsequent Event in the Notes to Consolidated Financial Statements under Item 1 of this Form 10-Q.

Capital expenditures. Our business is capital intensive, requiring significant investment to maintain and improve existing facilities or develop new midstream infrastructure. We categorize capital expenditures as either of the following:

• maintenance capital expenditures, which include those expenditures required to maintain the existing operating capacity and service capability of our assets, such as to replace system components and equipment that have been subject to significant use over time, become obsolete or reached the end of their useful lives, to remain in compliance with regulatory or legal requirements or to complete additional well connections to maintain existing system throughput and related cash flows (for fiscal year 2014, the general partner’s board of directors has approved Estimated Maintenance Capital Expenditures (as defined in our partnership agreement) of $15.3 million per quarter); or

• expansion capital expenditures, which include expenditures to construct new midstream infrastructure and those expenditures incurred to extend the useful lives of our assets, reduce costs, increase revenues or increase system throughput or capacity from current levels, including well connections that increase existing system throughput.

39

Capital expenditures in the consolidated statements of cash flows reflect capital expenditures on a cash basis, when payments are made. Capital incurred is presented on an accrual basis. Capital expenditures as presented in the consolidated statements of cash flows and capital incurred were as follows:

	Nine Months Ended   September 30,
thousands	2014		2013
Acquisitions	$	372,393	$	710,158
Expansion capital expenditures	$	459,301	$	450,107
Maintenance capital expenditures (1)	32,803		19,571
Total capital expenditures (1) (2)	$	492,104	$	469,678
Capital incurred (3)	$	490,326	$	458,236

⁽¹⁾  Maintenance capital expenditures for the nine months ended September 30, 2014 and 2013, are presented net of $0.2 million and zero, respectively, of contributions in aid of construction costs from affiliates.

⁽²⁾  Capital expenditures for the nine months ended September 30, 2014 and 2013, included $7.3 million and $8.0 million, respectively, of capitalized interest. Capital expenditures included the noncontrolling interest owner’s share of Chipeta’s capital expenditures, funded by contributions from the noncontrolling interest owner for all periods presented.

⁽³⁾  Includes the noncontrolling interest owner’s share of Chipeta’s capital incurred, funded by contributions from the noncontrolling interest owner for all periods presented. Capital incurred for the nine months ended September 30, 2014 and 2013, included $7.3 million and $8.0 million, respectively, of capitalized interest. Capital incurred for the nine months ended September 30, 2013, included $8.8 million of pre-acquisition capital incurred for the Non-Operated Marcellus Interest.

Acquisitions included the TEFR Interests in the first quarter of 2014, OTTCO in the third quarter of 2013, the Mont Belvieu JV in the second quarter of 2013, and the Anadarko-Operated Marcellus Interest and the Non-Operated Marcellus Interest in the first quarter of 2013. See Note 2—Acquisitions in the Notes to Consolidated Financial Statements under Item 1 of this Form 10-Q.

Capital expenditures, excluding acquisitions, increased by $22.4 million for the nine months ended September 30, 2014. Expansion capital expenditures increased by $9.2 million (including a $0.7 million decrease in capitalized interest) for the nine months ended September 30, 2014, primarily due to an increase of $118.4 million at the DJ Basin complex, related to compression projects and well connections, as well as the continued construction of a second train. In addition, there was an increase of $17.4 million at the Haley gathering system, $8.7 million at the Hilight system, $5.1 million at the Anadarko-Operated Marcellus Interest and $4.9 million at Chipeta. These increases were partially offset by a $93.1 million decrease at the Brasada facility due to construction being completed in June 2013 and a $53.4 million decrease at the Non-Operated Marcellus Interest. Maintenance capital expenditures increased by $13.2 million, primarily as a result of increased expenditures of $7.0 million at the DJ Basin complex, $4.8 million at the Non-Operated Marcellus Interest and $1.0 million at the Red Desert complex.

We have updated our estimated total capital expenditures for the year ending December 31, 2014, including our 75% share of Chipeta’s capital expenditures and excluding acquisitions and equity investments, from an originally reported range of $668 million to $718 million, to a current range of $628 million to $678 million. Total capital expenditures including equity investments, but excluding acquisitions, are expected to be between $670 million and $720 million.

40

Historical cash flow. The following table and discussion present a summary of our net cash flows provided by (used in) operating activities, investing activities and financing activities:

	Nine Months Ended   September 30,
thousands	2014			2013
Net cash provided by (used in):
Operating activities	$	403,767		$	317,317
Investing activities	(913,372		)	(1,432,048		)
Financing activities	476,714			733,114
Net increase (decrease) in cash and cash equivalents	$	(32,891	)	$	(381,617	)

Operating Activities. Net cash provided by operating activities during the nine months ended September 30, 2014, increasedprimarily due to the impact of changes in working capital items, as well as $4.7 million of proceeds received from an insurance claim settlement for business interruption at the Chipeta gas processing plant in 2013.

Refer to Operating Results within this Item 2 for a discussion of our results of operations as compared to the prior periods.

Investing Activities. Net cash used in investing activities for the nine months ended September 30, 2014, included the following:

• $492.1 million of capital expenditures, net of $0.2 million of contributions in aid of construction costs from affiliate, primarily related to projects at the DJ Basin complex, which include the continued construction of a second train and compressor expansions;

• $356.3 million of cash paid for the acquisition of the TEFR Interests;

• $40.0 million of cash paid related to FRP construction, which was completed in March 2014;

• $16.1 million of cash paid for equipment purchases from Anadarko;

• $14.4 million of distributions from equity investments in excess of cumulative earnings;

• $10.5 million of cash paid for a White Cliffs expansion project; and

• $6.3 million of cash paid related to TEP construction, which was completed in November 2013.

Net cash used in investing activities for the nine months ended September 30, 2013, included the following:

• $469.7 million of capital expenditures;

• $465.5 million of cash paid for the Non-Operated Marcellus Interest acquisition;

• $205.6 million of capital contributions to TEG, TEP and FRP for construction costs;

• $134.6 million of cash paid for the Anadarko-Operated Marcellus Interest acquisition;

• $78.1 million of cash paid for the Mont Belvieu JV acquisition;

• $27.5 million of cash paid for the OTTCO acquisition;

• $27.6 million of capital contributions to the Mont Belvieu JV to fund our share of construction costs for the fractionation facilities;

41

• $19.1 million of cash paid for a White Cliffs expansion project; and

• $4.4 million of cash paid for equipment purchases from Anadarko.

Financing Activities. Net cash provided by financing activities for the nine months ended September 30, 2014, included the following:

• $389.5 million of net proceeds from the 2044 Notes offering in March 2014, after underwriting and original issue discounts and offering costs, all of which was used to repay a portion of our outstanding borrowings under our RCF, including $350.0 million of borrowings to fund the acquisition of the TEFR Interests;

• $350.0 million of borrowings to fund the acquisition of the TEFR Interests;

• $300.0 million of borrowings to fund capital expenditures and for general partnership purposes;

• $100.0 million of net proceeds from the additional 2018 Notes offering in March 2014, after underwriting discounts, original issue premium and offering costs, part of which was used to repay a portion of our outstanding borrowings under our RCF;

• $83.3 million of net proceeds from activity under the Continuous Offering Program (as defined and discussed in Registered Securities within this Item 2), including net proceeds from the issuance of general partner units to our general partner to maintain its 2.0% general partner interest;

• $18.1 million of net proceeds related to the partial exercise of the underwriters’ over-allotment option granted in connection with our December 2013 equity offering; and

• $0.4 million of net proceeds from the issuance of general partner units to our general partner to maintain its 2.0% general partner interest after common units were issued in conjunction with the acquisition of the TEFR Interests.

Net contributions from Anadarko attributable to intercompany balances were $23.8 million during the nine months ended September 30, 2014, representing intercompany transactions attributable to the acquisition of the TEFR Interests.

Net cash provided by financing activities for the nine months ended September 30, 2013, included the following:

• $424.7 million of net proceeds from our May 2013 equity offering, $245.0 million of which was used to repay a portion of our outstanding borrowings under our RCF;

• $250.0 million of borrowings to fund the Non-Operated Marcellus Interest acquisition;

• $247.6 million of net proceeds from our 2018 Notes offering in August 2013, after underwriting and original issue discounts and offering costs, all of which was used to repay a portion of our outstanding borrowings under our RCF;

• $184.0 million of borrowings to fund capital expenditures;

• $133.5 million of borrowings to fund the Anadarko-Operated Marcellus Interest acquisition;

• $27.5 million of borrowings to fund the OTTCO acquisition;

42

• $2.6 million of net proceeds from activity under the Continuous Offering Program (as defined and discussed in Registered Securities within this Item 2), including net proceeds from the issuance of general partner units to our general partner to maintain its 2.0% general partner interest; and

• $0.5 million of net proceeds from the issuance of general partner units to our general partner to maintain its 2.0% general partner interest after common units were issued in conjunction with the Non-Operated Marcellus Interest acquisition.

Net contributions from Anadarko attributable to intercompany balances were $181.9 million during the nine months ended September 30, 2013, representing intercompany transactions attributable to the acquisitions of the TEFR Interests and the Non-Operated Marcellus Interest.

For the nine months ended September 30, 2014 and 2013, we paid $297.0 million and $215.1 million, respectively, of cash distributions to our unitholders. Contributions from the noncontrolling interest owner of Chipeta totaled zero and $2.2 million during the nine months ended September 30, 2014 and 2013, respectively, primarily for expansion of the cryogenic units and plant construction. Distributions to the noncontrolling interest owner of Chipeta totaled $11.3 million and $8.0 million for the nine months ended September 30, 2014 and 2013, respectively, representing the distributions paid as of September 30 of the respective year.

Debt and credit facility. At September 30, 2014, our debt outstanding consisted of $500.0 million aggregate principal amount of 5.375% Senior Notes due 2021 (the “2021 Notes”), $670.0 million aggregate principal amount of 4.000% Senior Notes due 2022 (the “2022 Notes”), $350.0 million aggregate principal amount of 2.600% Senior Notes due 2018 (the “2018 Notes”), and $400.0 million aggregate principal amount of 5.450% Senior Notes due 2044 (the “2044 Notes”), and the RCF. The two tranches of the 2022 Notes, issued in June and October 2012, were issued under the same indenture and are considered a single class of securities. The two tranches of the 2018 Notes, issued in August 2013 and March 2014, were issued under the same indenture and are considered a single class of securities. As of September 30, 2014, the carrying value of our outstanding debt consisted of $495.6 million of 2021 Notes, $673.0 million of 2022 Notes, $350.5 million of 2018 Notes, $393.8 million of 2044 Notes and $170.0 million of borrowings under the RCF. See Note 8—Debt and Interest Expense in the Notes to Consolidated Financial Statements under Item 1 of this Form 10-Q.

Senior Notes. The 2044 Notes issued in March 2014 were offered at a price to the public of 98.443% of the face amount. Including the effects of the issuance and underwriting discounts, the effective interest rate of the 2044 Notes is 5.633%. Interest is paid semi-annually on April 1 and October 1 of each year. Proceeds (net of underwriting discount of $3.5 million, original issue discount and debt issuance costs) were used to repay amounts then outstanding under our RCF and for general partnership purposes.

The 2018 Notes issued in March 2014 were offered at a price to the public of 100.857% of the face amount. Including the effects of the issuance premium for the March 2014 offering, the issuance discount for the August 2013 offering of 2018 Notes, and underwriting discounts, the effective interest rate of the 2018 Notes is 2.743%. Interest is paid semi-annually on February 15 and August 15 of each year. Proceeds (net of underwriting discount of $0.6 million, original issue premium and debt issuance costs) were used to repay amounts then outstanding under our RCF and for general partnership purposes.

At September 30, 2014, we were in compliance with all covenants under the indentures governing the 2021 Notes, 2022 Notes, 2018 Notes, and 2044 Notes.

43

Revolving credit facility. In February 2014, we entered into an amended and restated $1.2 billion senior unsecured RCF, which is expandable to a maximum of $1.5 billion, replacing an $800.0 million credit facility, which was originally entered into in March 2011. Subsequent to February 2014, we borrowed $350.0 million under the RCF to fund the acquisition of the TEFR Interests (see Note 2—Acquisitions in the Notes to Consolidated Financial Statements under Item 1 of this Form 10-Q). The RCF matures in February 2019 and bears interest at London Interbank Offered Rate (“LIBOR”), plus applicable margins ranging from 0.975% to 1.45%, or an alternate base rate equal to the greatest of (a) the Prime Rate, (b) the Federal Funds Effective Rate plus 0.5%, or (c) LIBOR plus 1%, in each case plus applicable margins currently ranging from zero to 0.45%, based upon our senior unsecured debt rating. As of September 30, 2014, we had $170.0 million of outstanding borrowings, $12.8 million in outstanding letters of credit and $1.0 billion available for borrowing under the RCF. The interest rate on the RCF was 1.46% at September 30, 2014. At December 31, 2013, the interest rate on the previous credit facility was 1.67%. We are required to pay a quarterly facility fee currently ranging from 0.15% to 0.30% of the commitment amount (whether used or unused), based upon our senior unsecured debt rating. The facility fee rate was 0.20% and 0.25% at September 30, 2014, and December 31, 2013, respectively. At September 30, 2014, we were in compliance with all covenants under the RCF. See Note 10—Subsequent Event in the Notes to Consolidated Financial Statements under Item 1 of this Form 10-Q.

The 2021 Notes, 2022 Notes, 2018 Notes, 2044 Notes and obligations under the RCF are recourse to our general partner. Our general partner is indemnified by a wholly owned subsidiary of Anadarko, Western Gas Resources, Inc. (“WGRI”), against any claims made against our general partner under the 2022 Notes, 2021 Notes, and/or the RCF.

In connection with the acquisitions of the Non-Operated Marcellus Interest, the Anadarko-Operated Marcellus Interest, and the TEFR Interests, our general partner and other wholly owned subsidiaries of Anadarko entered into indemnification agreements, whereby such subsidiaries agreed to indemnify our general partner for any recourse liability it may have for RCF borrowings, or other debt financing, attributable to the acquisitions of the Non-Operated Marcellus Interest, the Anadarko-Operated Marcellus Interest, and the TEFR Interests. These indemnification agreements apply to the 2044 Notes, 2018 Notes, and/or RCF borrowings outstanding related to the aforementioned acquisitions.

Our general partner, the other indemnifying subsidiaries of Anadarko and WGRI also amended and restated the indemnity agreements between them to (i) conform language among all the indemnification agreements and (ii) reduce the amount for which WGRI would indemnify our general partner by an amount equal to any amounts payable to the general partner under the indemnification agreements related to the acquisitions of the Non-Operated Marcellus Interest, the Anadarko-Operated Marcellus Interest, and the TEFR Interests.

Registered securities. We may issue an indeterminate amount of common units and various debt securities under our effective shelf registration statements on file with the SEC.

In August 2012, we filed a registration statement with the SEC authorizing the issuance of up to an aggregate of $125.0 million of common units, in amounts, at prices and on terms to be determined by market conditions and other factors at the time of our offerings. See Note 4—Equity and Partners’ Capital in the Notes to Consolidated Financial Statements under Item 1 of this Form 10-Q for a discussion of trades completed under the Continuous Offering Program. As of September 30, 2014, we had used all the capacity to issue common units under this registration statement.

In August 2014, we filed a registration statement with the SEC authorizing the issuance of up to an aggregate of $500.0 million of common units, in amounts, at prices and on terms to be determined by market conditions and other factors at the time of our offerings. As of September 30, 2014, we had not issued any common units under such registration statement.

44

Credit risk. We bear credit risk represented by our exposure to non-payment or non-performance by our counterparties, including Anadarko, financial institutions, customers and other parties. Generally, non-payment or non-performance results from a customer’s inability to satisfy payables to us for services rendered or volumes owed pursuant to gas imbalance agreements. We examine and monitor the creditworthiness of third-party customers and may establish credit limits for third-party customers. A substantial portion of our throughput, however, comes from producers that have investment-grade ratings.

We are dependent upon a single producer, Anadarko, for the substantial majority of our natural gas volumes, and we do not maintain a credit limit with respect to Anadarko. Consequently, we are subject to the risk of non-payment or late payment by Anadarko for gathering, processing and transportation fees and for proceeds from the sale of residue, NGLs and condensate to Anadarko.

We expect our exposure to concentrated risk of non-payment or non-performance to continue for as long as we remain substantially dependent on Anadarko for our revenues. Additionally, we are exposed to credit risk on the note receivable from Anadarko, which was issued concurrently with the closing of our initial public offering. We are also party to agreements with Anadarko under which Anadarko is required to indemnify us for certain environmental claims, losses arising from rights-of-way claims, failures to obtain required consents or governmental permits and income taxes with respect to the assets acquired from Anadarko. Finally, we have entered into various commodity price swap agreements with Anadarko in order to reduce our exposure to commodity price risk and are subject to performance risk thereunder.

Our ability to make distributions to our unitholders may be adversely impacted if Anadarko becomes unable to perform under the terms of our gathering, processing and transportation agreements, natural gas and NGL purchase agreements, Anadarko’s note payable to us, our omnibus agreement, the services and secondment agreement, contribution agreements or the commodity price swap agreements.

CONTRACTUAL OBLIGATIONS

Our contractual obligations include, among other things, a revolving credit facility, other third-party long-term debt, capital obligations related to our expansion projects and various operating leases. Refer toNote 8—Debt and Interest Expense and Note 9—Commitments and Contingencies in the Notes to Consolidated Financial Statements under Item 1 of this Form 10-Q for an update to our contractual obligations as of September 30, 2014, including, but not limited to, increases in committed capital.

OFF-BALANCE SHEET ARRANGEMENTS

We do not have any off-balance sheet arrangements other than operating leases. The information pertaining to operating leases required for this item is provided under Note 9—Commitments and Contingencies included in the Notes to Consolidated Financial Statements under Item 1 of this Form 10-Q.

RECENT ACCOUNTING DEVELOPMENTS

Accounting Standards Update (“ASU”) 2014-09, Revenue from Contracts with Customers, supersedes the revenue recognition requirements inTopic605, Revenue Recognition, and industry-specific guidance in Subtopic 932-605, Extractive Activities—Oil and Gas—Revenue Recognition, and requires an entity to recognize revenue when it transfers promised goods or services to customers in an amount that reflects the consideration to which the entity expects to be entitled in exchange for those goods or services. This ASU is effective for annual and interim periods beginning in 2017 and is required to be adopted using one of two retrospective application methods, with no early adoption permitted. We are currently evaluating the impact of the adoption of this ASU on our consolidated financial statements.

45

ASU 2014-08, Reporting Discontinued Operations and Disclosures of Disposals of Components of an Entity,changes the criteria for reporting discontinued operations and requires additional disclosures, both for discontinued operations and for individually significant dispositions and assets classified as held for sale not qualifying as discontinued operations. This ASU is effective for annual and interim periods beginning in 2015, with early adoption permitted for disposals or for assets classified as held for sale that have not been reported in previously issued financial statements. We early adopted this ASU on a prospective basis beginning with the first quarter of 2014. The adoption did not have a material impact on our consolidated financial statements.

ASU 2013-11, Presentation of an Unrecognized Tax Benefit When a Net Operating Loss Carryforward, a Similar Tax Loss, or a Tax Credit Carryforward Exists,requires that an unrecognized tax benefit, or a portion of an unrecognized tax benefit, be presented in the financial statements as a reduction to a deferred tax asset, except in certain circumstances. This ASU is effective for annual and interim periods beginning in 2014. We adopted this ASU on a prospective basis beginning with the first quarter of 2014. The adoption did not have a material impact on our consolidated financial statements.

Item 3. Quantitative and Qualitative Disclosures About Market Risk

Commodity price risk. Certain of our processing services are provided under percent-of-proceeds and keep-whole agreements in which Anadarko is typically responsible for the marketing of the natural gas and NGLs. Under percent-of-proceeds agreements, we receive a specified percentage of the net proceeds from the sale of natural gas and NGLs. Under keep-whole agreements, we keep 100% of the NGLs produced, and the processed natural gas, or value of the gas, is returned to the producer. Since some of the gas is used and removed during processing, we compensate the producer for this amount of gas by supplying additional gas or by paying an agreed-upon value for the gas utilized.

To mitigate our exposure to changes in commodity prices as a result of the purchase and sale of natural gas, condensate or NGLs, we currently have in place commodity price swap agreements with Anadarko expiring at various times through December 2016. For additional information on the commodity price swap agreements, see Note 5—Transactions with Affiliates in the Notes to Consolidated Financial Statements under Item 1 of this Form 10-Q.

In addition, pursuant to certain of our contracts, we retain and sell drip condensate that is recovered during the gathering of natural gas. As part of this arrangement, we are required to provide a thermally equivalent volume of natural gas or the cash equivalent thereof to the shipper. Thus, our revenues for this portion of our contractual arrangement are based on the price received for the drip condensate, and our costs for this portion of our contractual arrangement depend on the price of natural gas. Historically, drip condensate sells at a price representing a discount to the price of New York Mercantile Exchange, or NYMEX, West Texas Intermediate crude oil.

We consider our exposure to commodity price risk associated with the above-described arrangements to be minimal given the existence of the commodity price swap agreements with Anadarko and the relatively small amount of our operating income that is impacted by changes in market prices. Accordingly, we do not expect that a 10% increase or decrease in natural gas or NGL prices would have a material impact on our operating income, financial condition or cash flows for the next twelve months, excluding the effect of natural gas imbalances described below.

We bear a limited degree of commodity price risk with respect to settlement of our natural gas imbalances that arise from differences in gas volumes received into our systems and gas volumes delivered by us to customers, as well as instances where our actual liquids recovery or fuel usage varies from the contractually stipulated amounts. Natural gas volumes owed to or by us that are subject to monthly cash settlement are valued according to the terms of the contract as of the balance sheet dates, and generally reflect market index prices. Other natural gas volumes owed to or by us are valued at our weighted average cost of natural gas as of the balance sheet dates and are settled in-kind. Our exposure to the impact of changes in commodity prices on outstanding imbalances depends on the timing of settlement of the imbalances.

Interest rate risk. Interest rates during the nine months ended September 30, 2014, were low compared to historic rates. As of September 30, 2014, we had $170.0 million of outstanding borrowings under our RCF (which bears interest at a rate based on LIBOR or, at our option, an alternative base rate). If interest rates rise, our future financing costs could increase. A 10% change in LIBOR would have resulted in a nominal change in net income and the fair value of the borrowings under the RCF at September 30, 2014.

We may incur additional variable-rate debt in the future, either under our RCF or other financing sources, including commercial bank borrowings or debt issuances.

46

Item 4.  Controls and Procedures

Evaluation of Disclosure Controls and Procedures. The Chief Executive Officer and Chief Financial Officer of the Partnership’s general partner performed an evaluation of the Partnership’s disclosure controls and procedures as defined in Rules 13a-15(e) and 15d-15(e) of the Securities Exchange Act of 1934 (“Exchange Act”). Our disclosure controls and procedures are designed to ensure that information required to be disclosed by us in the reports that we file or submit under the Exchange Act is recorded, processed, summarized and reported within the time periods specified in the rules and forms of the SEC, and to ensure that the information required to be disclosed by us in reports that we file under the Exchange Act is accumulated and communicated to our management, including our principal executive officer and principal financial officer, as appropriate, to allow timely decisions regarding required disclosure. Based on this evaluation, the Chief Executive Officer and Chief Financial Officer have concluded that the Partnership’s disclosure controls and procedures are effective as of September 30, 2014.

Changes in Internal Control Over Financial Reporting. There has been no change in our internal control over financial reporting during the quarter ended September 30, 2014, that has materially affected, or is reasonably likely to materially affect, the Partnership’s internal control over financial reporting.

PART II. OTHER INFORMATION

Item 1.  Legal Proceedings

WGR Operating, LP, a subsidiary of the Partnership, is currently in negotiations with the United States Environmental Protection Agency with respect to alleged non-compliance with the leak detection and repair requirements of the federal Clean Air Act at its Granger, Wyoming facility. Although management cannot predict the outcome of settlement discussions, management believes that it is reasonably likely a resolution of this matter will result in a fine or penalty in excess of $100,000.

Except as discussed above, we are not a party to any legal, regulatory or administrative proceedings other than proceedings arising in the ordinary course of our business. Management believes that there are no such proceedings for which a final disposition could have a material adverse effect on our results of operations, cash flows or financial condition.

47

Item 1A.  Risk Factors

Security holders and potential investors in our securities should carefully consider the risk factors included below, as well as those set forth under Part I, Item 1A in our Form 10-K for the year ended December 31, 2013, together with all of the other information included in this document, and in our other public filings, press releases, and public discussions with management of the Partnership. Additionally, for a full discussion of the risks associated with Anadarko’s business, see Item 1A under Part I in Anadarko’s Form 10-K for the year ended December 31, 2013, Anadarko’s quarterly reports on Form 10-Q and Anadarko’s other public filings, press releases, and public discussions with Anadarko management. We have identified these risk factors as important factors that could cause our actual results to differ materially from those contained in any written or oral forward-looking statements made by us or on our behalf.

State and local legislative and regulatory initiatives relating to oil and gas operations could adversely affect Anadarko’s and our third-party customers’ production and, therefore, adversely impact our midstream operations.

Certain states in which we operate have adopted, and other states are considering adopting, measures that could impose new or more stringent requirements on oil and gas exploration and production activities. For example, in exchange for the withdrawal of several initiatives relating to hydraulic fracturing and other oil and gas operations proposed for inclusion on the Colorado state ballot in November 2014, the governor of Colorado created the Task Force on State and Local Regulation of Oil and Gas Operations in September 2014 to make recommendations to the state legislature regarding the responsible development of Colorado’s oil and gas resources. Although it is early in the process, it is possible that, as a result of the Task Force’s recommendations, the Colorado state legislature could adopt new policies or legislation relating to oil and gas operations, including measures that would give local governments in Colorado greater authority to limit hydraulic fracturing and other oil and gas operations.

In the event state or local restrictions or prohibitions are adopted in our areas of operations, such as in the Wattenberg field, our customers, including Anadarko, may incur significant compliance costs or may experience delays or curtailment in the pursuit of their exploration, development, or production activities, and possibly be limited or precluded in the drilling of certain wells altogether. Any adverse impact on our customers’ activities would have a corresponding negative impact on our throughput volumes. Accordingly, such restrictions or prohibitions could have a material adverse effect on our business, prospects, results of operations, financial condition, cash flows and ability to make distributions to our unitholders.

Item 2. Unregistered Sales of Equity Securities and Use of Proceeds

In connection with common units issued through the Continuous Offering Program, our general partner purchased 23,132 general partner units for $1.7 million in cash during the nine months ended September 30, 2014, to maintain its 2.0% general partner interest in us. Proceeds from the Continuous Offering Program, including from the sale of the general partner units, were used for general partnership purposes, including the funding of capital expenditures. The general partner units were issued in reliance on an exemption from registration under Section 4(2) of the Securities Act of 1933, as amended.

48

Item 6. Exhibits

Exhibits designated by an asterisk (*) are filed herewith and those designated with asterisks (**) are furnished herewith; all exhibits not so designated are incorporated herein by reference to a prior filing as indicated.

Exhibit Number	Description
2.1#	Contribution, Conveyance and Assumption Agreement by and among Western Gas Partners, LP, Western Gas Holdings, LLC, Anadarko Petroleum Corporation, WGR Holdings, LLC, Western Gas Resources, Inc., WGR Asset Holding Company LLC, Western Gas Operating, LLC and WGR Operating, LP, dated as of May 14, 2008 (incorporated by reference to Exhibit 10.2 to Western Gas Partners, LP’s Current Report on Form 8-K filed on May 14, 2008, File No. 001-34046).
2.2#	Contribution Agreement, dated as of November 11, 2008, by and among Western Gas Resources, Inc., WGR Asset Holding Company LLC, WGR Holdings, LLC, Western Gas Holdings, LLC, Western Gas Partners, LP, Western Gas Operating, LLC and WGR Operating, LP. (incorporated by reference to Exhibit 10.1 to Western Gas Partners, LP’s Current Report on Form 8-K filed on November 13, 2008, File No. 001-34046).
2.3#	Contribution Agreement, dated as of July 10, 2009, by and among Western Gas Resources, Inc., WGR Asset Holding Company LLC, Anadarko Uintah Midstream, LLC, WGR Holdings, LLC, Western Gas Holdings, LLC, WES GP, Inc., Western Gas Partners, LP, Western Gas Operating, LLC and WGR Operating, LP. (incorporated by reference to Exhibit 2.1 to Western Gas Partners, LP’s Current Report on Form 8-K filed on July 23, 2009, File No. 001-34046).
2.4#	Contribution Agreement, dated as of January 29, 2010 by and among Western Gas Resources, Inc., WGR Asset Holding Company LLC, Mountain Gas Resources LLC, WGR Holdings, LLC, Western Gas Holdings, LLC, WES GP, Inc., Western Gas Partners, LP, Western Gas Operating, LLC and WGR Operating, LP. (incorporated by reference to Exhibit 2.1 to Western Gas Partners, LP’s Current Report on Form 8-K filed on February 3, 2010 File No. 001-34046).
2.5#	Contribution Agreement, dated as of July 30, 2010, by and among Western Gas Resources, Inc., WGR Asset Holding Company LLC, WGR Holdings, LLC, Western Gas Holdings, LLC, WES GP, Inc., Western Gas Partners, LP, Western Gas Operating, LLC and WGR Operating, LP. (incorporated by reference to Exhibit 2.1 to Western Gas Partners, LP’s Current Report on Form 8-K filed on August 5, 2010, File No. 001-34046).
2.6#	Purchase and Sale Agreement, dated as of January 14, 2011, by and among Western Gas Partners, LP, Kerr-McGee Gathering LLC and Encana Oil & Gas (USA) Inc. (incorporated by reference to Exhibit 2.1 to Western Gas Partners, LP’s Current Report on Form 8-K filed on January 18, 2011 File No. 001-34046).
2.7#	Contribution Agreement, dated as of December 15, 2011, by and among Western Gas Resources, Inc., WGR Asset Holding Company LLC, WGR Holdings, LLC, Western Gas Holdings, LLC, WES GP, Inc., Western Gas Partners, LP, Western Gas Operating, LLC and WGR Operating, LP. (incorporated by reference to Exhibit 2.1 to Western Gas Partners, LP’s Current Report on Form 8-K filed on December 15, 2011, File No. 001-34046).
2.8#	Contribution Agreement, dated as of February 27, 2013, by and among Anadarko Marcellus Midstream, L.L.C., Western Gas Partners, LP, Western Gas Operating, LLC, WGR Operating, LP, Anadarko Petroleum Corporation and Anadarko E&P Onshore LLC (incorporated by reference to Exhibit 2.1 to Western Gas Partners, LP’s Current Report on Form 8-K filed on March 5, 2013, File No. 001-34046).
2.9#	Contribution Agreement, dated as of February 27, 2014, by and among WGR Asset Holding Company, LLC, APC Midstream Holdings, LLC, Western Gas Partners, LP, Western Gas Operating, LLC, WGR Operating, LP and Anadarko Petroleum Corporation (incorporated by reference to Exhibit 2.9 to the Annual Report on Form 10-K filed by Western Gas Partners, LP on February 28, 2014, File No. 001-34046).

49

Exhibit Number	Description
3.1	Certificate of Limited Partnership of Western Gas Partners, LP (incorporated by reference to Exhibit 3.1 to Western Gas Partners, LP’s Registration Statement on Form S-1 filed on October 15, 2007, File No. 333-146700).
3.2	First Amended and Restated Agreement of Limited Partnership of Western Gas Partners, LP, dated May 14, 2008 (incorporated by reference to Exhibit 3.1 to Western Gas Partners, LP’s Current Report on Form 8-K filed on May 14, 2008, File No. 001-34046).
3.3	Amendment No. 1 to First Amended and Restated Agreement of Limited Partnership of Western Gas Partners, LP dated December 19, 2008 (incorporated by reference to Exhibit 3.1 to Western Gas Partners, LP’s Current Report on Form 8-K filed on December 24, 2008, File No. 001-34046).
3.4	Amendment No. 2 to First Amended and Restated Agreement of Limited Partnership of Western Gas Partners, LP, dated as of April 15, 2009 (incorporated by reference to Exhibit 3.1 to Western Gas Partners, LP’s Current Report on Form 8-K filed on April 20, 2009, File No. 001-34046).
3.5	Amendment No. 3 to First Amended and Restated Agreement of Limited Partnership of Western Gas Partners, LP dated July 22, 2009 (incorporated by reference to Exhibit 3.1 to Western Gas Partners, LP’s Current Report on Form 8-K filed on July 23, 2009, File No. 001-34046).
3.6	Amendment No. 4 to First Amended and Restated Agreement of Limited Partnership of Western Gas Partners, LP dated January 29, 2010 (incorporated by reference to Exhibit 3.1 to Western Gas Partners, LP’s Current Report on Form 8-K filed on February 3, 2010, File No. 001-34046).
3.7	Amendment No. 5 to First Amended and Restated Agreement of Limited Partnership of Western Gas Partners, LP, dated August 2, 2010 (incorporated by reference to Exhibit 3.1 to Western Gas Partners, LP’s Current Report on Form 8-K filed on August 5, 2010, File No. 001-34046).
3.8	Amendment No. 6 to First Amended and Restated Agreement of Limited Partnership of Western Gas Partners, LP, dated July 8, 2011 (incorporated by reference to Exhibit 3.1 to Western Gas Partners, LP’s Current Report on Form 8-K filed on July 8, 2011, File No. 001-34046).
3.9	Amendment No. 7 to First Amended and Restated Agreement of Limited Partnership of Western Gas Partners, LP, dated January 13, 2012 (incorporated by reference to Exhibit 3.1 to Western Gas Partners, LP’s Current Report on Form 8-K filed on January 17, 2012, File No. 001-34046).
3.10	Amendment No. 8 to First Amended and Restated Agreement of Limited Partnership of Western Gas Partners, LP, dated August 1, 2012 (incorporated by reference to Exhibit 3.10 to Western Gas Partners, LP’s Quarterly Report on Form 10-Q filed on August 2, 2012, File No. 001-34046).
3.11	Amendment No. 9 to First Amended and Restated Agreement of Limited Partnership of Western Gas Partners, LP, dated December 12, 2012 (incorporated by reference to Exhibit 3.1 to Western Gas Partners, LP’s Current Report on Form 8-K filed on December 12, 2012, File No. 001-34046).
3.12	Amendment No. 10 to First Amended and Restated Agreement of Limited Partnership of Western Gas Partners, LP, dated March 1, 2013 (incorporated by reference to Exhibit 3.1 to Western Gas Partners, LP’s Current Report on Form 8-K filed on March 5, 2013, File No. 001-34046).
3.13	Amendment No. 11 to First Amended and Restated Agreement of Limited Partnership of Western Gas Partners, LP, dated March 3, 2014 (incorporated by reference to Exhibit 3.1 to Western Gas Partners, LP’s Current Report on Form 8-K filed on March 5, 2014, File No. 001-34046).
3.14	Certificate of Formation of Western Gas Holdings, LLC (incorporated by reference to Exhibit 3.3 to Western Gas Partners, LP’s Registration Statement on Form S-1 filed on October 15, 2007, File No. 333-146700).
3.15	Second Amended and Restated Limited Liability Company Agreement of Western Gas Holdings, LLC, dated December 12, 2012 (incorporated by reference to Exhibit 3.2 to Western Gas Partners, LP’s Current Report on Form 8-K filed on December 12, 2012, File No. 001-34046).
4.1	Specimen Unit Certificate for the Common Units (incorporated by reference to Exhibit 4.1 to Western Gas Partners, LP’s Quarterly Report on Form 10-Q filed on June 13, 2008, File No. 001-34046).
4.2	Indenture, dated as of May 18, 2011, among Western Gas Partners, LP, as Issuer, the Subsidiary Guarantors named therein, as Guarantors, and Wells Fargo Bank, National Association, as Trustee (incorporated by reference to Exhibit 4.1 to Western Gas Partners, LP’s Current Report on Form 8-K filed on May 18, 2011, File No. 001-34046).

50

Exhibit Number	Description
4.3	First Supplemental Indenture, dated as of May 18, 2011, among Western Gas Partners, LP, as Issuer, the Subsidiary Guarantors named therein, as Guarantors, and Wells Fargo Bank, National Association, as Trustee (incorporated by reference to Exhibit 4.2 to Western Gas Partners, LP’s Current Report on Form 8-K filed on May 18, 2011, File No. 001-34046).
4.4	Form of 5.375% Senior Notes due 2021 (incorporated by reference to Exhibit 4.2 to Western Gas Partners, LP’s Current Report on Form 8-K filed on May 18, 2011, File No. 001-34046).
4.5	Fifth Supplemental Indenture, dated as of August 14, 2013, among Western Gas Partners, LP, as Issuer, and Wells Fargo Bank, National Association, as Trustee (incorporated by reference to Exhibit 4.1 to Western Gas Partners, LP’s Current Report on Form 8-K filed on August 14, 2013, File No. 001-34046).
4.6	Form of 4.000% Senior Notes due 2022 (incorporated by reference to Exhibit 4.1 to Western Gas Partners, LP’s Current Report on Form 8-K filed on June 28, 2012, File No. 001-34046).
4.7	Form of 2.600% Senior Notes due 2018 (incorporated by reference to Exhibit 4.1 to Western Gas Partners, LP’s Current Report on Form 8-K filed on August 14, 2013, File No. 001-34046).
4.8	Sixth Supplemental Indenture, dated as of March 20, 2014, among Western Gas Partners, LP, as Issuer, and Wells Fargo Bank, National Association, as Trustee (incorporated by reference to Exhibit 4.2 to Western Gas Partners, LP’s Current Report on Form 8-K filed on March 20, 2014, File No. 001-34046).
4.9	Form of 5.450% Senior Notes due 2044 (incorporated by reference to Exhibit 4.2 to Western Gas Partners, LP’s Current Report on Form 8-K filed on March 20, 2014, File No. 001-34046).
31.1*	Certification of Chief Executive Officer, pursuant to Rule 13a-14(a)/15d-14(a), as adopted pursuant to Section 302 of the Sarbanes-Oxley Act of 2002.
31.2*	Certification of Chief Financial Officer, pursuant to Rule 13a-14(a)/15d-14(a), as adopted pursuant to Section 302 of the Sarbanes-Oxley Act of 2002.
32.1**	Certifications of Chief Executive Officer and Chief Financial Officer pursuant to 18 U.S.C. Section 1350, as adopted pursuant to Section 906 of the Sarbanes-Oxley Act of 2002.
101.INS*	XBRL Instance Document
101.SCH*	XBRL Schema Document
101.CAL*	XBRL Calculation Linkbase Document
101.DEF*	XBRL Definition Linkbase Document
101.LAB*	XBRL Label Linkbase Document
101.PRE*	XBRL Presentation Linkbase Document

# Pursuant to Item 601(b)(2) of Regulation S-K, the registrant agrees to furnish supplementally a copy of any omitted schedule to the Securities and Exchange Commission upon request.

51

SIGNATURES

Pursuant to the requirements of the Securities Exchange Act of 1934, the registrant has duly caused this report to be signed on its behalf by the undersigned thereunto duly authorized.

	WESTERN GAS PARTNERS, LP
October 29, 2014
	/s/ Donald R. Sinclair
	Donald R. Sinclair President and Chief Executive Officer Western Gas Holdings, LLC (as general partner of Western Gas Partners, LP)
October 29, 2014
	/s/ Benjamin M. Fink
	Benjamin M. Fink Senior Vice President, Chief Financial Officer and Treasurer Western Gas Holdings, LLC (as general partner of Western Gas Partners, LP)

52

EX-31.1

EXHIBIT 31.1

CERTIFICATION OF CHIEF EXECUTIVE OFFICER

PURSUANT TO RULE 13A-14(A) AND RULE 15D-14(A)

OF THE SECURITIES EXCHANGE ACT OF 1934, AS AMENDED

I, Donald R. Sinclair, certify that:

1. I have reviewed this quarterly report on Form 10-Q of Western Gas Partners, LP (the “registrant”);

2. Based on my knowledge, this report does not contain any untrue statement of a material fact or omit to state a material fact necessary to make the statements made, in light of the circumstances under which such statements were made, not misleading with respect to the period covered by this report;

3. Based on my knowledge, the financial statements, and other financial information included in this report, fairly present in all material respects the financial condition, results of operations and cash flows of the registrant as of, and for, the periods presented in this report;

4. The registrant’s other certifying officer and I are responsible for establishing and maintaining disclosure controls and procedures (as defined in Exchange Act Rules 13a-15(e) and 15d-15(e)) and internal control over financial reporting (as defined in Exchange Act Rules 13a-15(f) and 15d-15(f)) for the registrant and have:

(a) Designed such disclosure controls and procedures, or caused such disclosure controls and procedures to be designed under our supervision, to ensure that material information relating to the registrant, including its consolidated subsidiaries, is made known to us by others within those entities, particularly during the period in which this report is being prepared;

(b) Designed such internal control over financial reporting, or caused such internal control over financial reporting to be designed under our supervision, to provide reasonable assurance regarding the reliability of financial reporting and the preparation of financial statements for external purposes in accordance with generally accepted accounting principles;

(c) Evaluated the effectiveness of the registrant’s disclosure controls and procedures and presented in this report our conclusions about the effectiveness of the disclosure controls and procedures, as of the end of the period covered by this report based on such evaluation; and

(d) Disclosed in this report any change in the registrant’s internal control over financial reporting that occurred during the registrant’s most recent fiscal quarter (the registrant’s fourth fiscal quarter in the case of an annual report) that has materially affected, or is reasonably likely to materially affect, the registrant’s internal control over financial reporting; and

5. The registrant’s other certifying officer and I have disclosed, based on our most recent evaluation of internal control over financial reporting, to the registrant’s auditors and the audit committee of the registrant’s board of directors (or persons performing the equivalent functions):

(a) All significant deficiencies and material weaknesses in the design or operation of internal control over financial reporting which are reasonably likely to adversely affect the registrant’s ability to record, process, summarize and report financial information; and

(b) Any fraud, whether or not material, that involves management or other employees who have a significant role in the registrant’s internal control over financial reporting.

Date: October 29, 2014

/s/ Donald R. Sinclair

Donald R. Sinclair

President and Chief Executive Officer

Western Gas Holdings, LLC

(as general partner of Western Gas Partners, LP)

EX-31.2

EXHIBIT 31.2

CERTIFICATION OF CHIEF FINANCIAL OFFICER

PURSUANT TO RULE 13A-14(A) AND RULE 15D-14(A)

OF THE SECURITIES EXCHANGE ACT OF 1934, AS AMENDED

I, Benjamin M. Fink, certify that:

1. I have reviewed this quarterly report on Form 10-Q of Western Gas Partners, LP (the “registrant”);

2. Based on my knowledge, this report does not contain any untrue statement of a material fact or omit to state a material fact necessary to make the statements made, in light of the circumstances under which such statements were made, not misleading with respect to the period covered by this report;

3. Based on my knowledge, the financial statements, and other financial information included in this report, fairly present in all material respects the financial condition, results of operations and cash flows of the registrant as of, and for, the periods presented in this report;

4. The registrant’s other certifying officer and I are responsible for establishing and maintaining disclosure controls and procedures (as defined in Exchange Act Rules 13a-15(e) and 15d-15(e)) and internal control over financial reporting (as defined in Exchange Act Rules 13a-15(f) and 15d-15(f)) for the registrant and have:

(a) Designed such disclosure controls and procedures, or caused such disclosure controls and procedures to be designed under our supervision, to ensure that material information relating to the registrant, including its consolidated subsidiaries, is made known to us by others within those entities, particularly during the period in which this report is being prepared;

(b) Designed such internal control over financial reporting, or caused such internal control over financial reporting to be designed under our supervision, to provide reasonable assurance regarding the reliability of financial reporting and the preparation of financial statements for external purposes in accordance with generally accepted accounting principles;

(c) Evaluated the effectiveness of the registrant’s disclosure controls and procedures and presented in this report our conclusions about the effectiveness of the disclosure controls and procedures, as of the end of the period covered by this report based on such evaluation; and

(d) Disclosed in this report any change in the registrant’s internal control over financial reporting that occurred during the registrant’s most recent fiscal quarter (the registrant’s fourth fiscal quarter in the case of an annual report) that has materially affected, or is reasonably likely to materially affect, the registrant’s internal control over financial reporting; and

5. The registrant’s other certifying officer and I have disclosed, based on our most recent evaluation of internal control over financial reporting, to the registrant’s auditors and the audit committee of the registrant’s board of directors (or persons performing the equivalent functions):

(a) All significant deficiencies and material weaknesses in the design or operation of internal control over financial reporting which are reasonably likely to adversely affect the registrant’s ability to record, process, summarize and report financial information; and

(b) Any fraud, whether or not material, that involves management or other employees who have a significant role in the registrant’s internal control over financial reporting. 

Date: October 29, 2014

/s/ Benjamin M. Fink

Benjamin M. Fink

Senior Vice President, Chief Financial Officer and Treasurer

Western Gas Holdings, LLC

(as general partner of Western Gas Partners, LP)

EX-32.1

EXHIBIT 32.1

CERTIFICATION PURSUANT TO

18 U.S.C. SECTION 1350

Pursuant to Section 906 of the Sarbanes-Oxley Act of 2002, 18 U.S.C. Section 1350, Donald R. Sinclair, President and Chief Executive Officer of Western Gas Holdings, LLC, the general partner of Western Gas Partners, LP (the “Partnership”) and Benjamin M. Fink, Senior Vice President, Chief Financial Officer and Treasurer of Western Gas Holdings, LLC, certify to the best of our knowledge that:

(1) the Quarterly Report on Form 10-Q of the Partnership for the period ending September 30, 2014, as filed with the Securities and Exchange Commission on the date hereof (the “Report”), fully complies with the requirements of Section 13(a) or 15(d) of the Securities Exchange Act of 1934; and

(2) the information contained in the Report fairly presents, in all material respects, the financial condition and results of operations of the Partnership.

October 29, 2014
	/s/ Donald R. Sinclair
	Donald R. Sinclair
	President and Chief Executive Officer
	Western Gas Holdings, LLC
	(as general partner of Western Gas Partners, LP)
October 29, 2014
	/s/ Benjamin M. Fink
	Benjamin M. Fink
	Senior Vice President, Chief Financial Officer and Treasurer
	Western Gas Holdings, LLC
	(as general partner of Western Gas Partners, LP)

The foregoing certifications are being furnished as an exhibit to the Report pursuant to Item 601(b)(32) of Regulation S-K and Section 906 of the Sarbanes-Oxley Act of 2002 (subsections (a) and (b) of Section 1350, Chapter 63 of Title 18, United States Code) and, accordingly, are not being filed as part of the Report for purposes of Section 18 of the Securities Exchange Act of 1934, as amended, and are not incorporated by reference into any filing of the Partnership, whether made before or after the date hereof, regardless of any general incorporation language in such filing.

XML

Transactions With Affiliates - Commodity Price Per Unit Table (details)	Sep. 30, 2014
Ethane [Member] | Year 2016 [Member]
Commodity Price Risk Swap [Line Items]
Commodity Swap Fixed Price	23.11
Ethane [Member] | Minimum [Member] | Year 2014 [Member]
Commodity Price Risk Swap [Line Items]
Commodity Swap Fixed Price	18.36
Ethane [Member] | Minimum [Member] | Year 2015 [Member]
Commodity Price Risk Swap [Line Items]
Commodity Swap Fixed Price	18.41
Ethane [Member] | Maximum [Member] | Year 2014 [Member]
Commodity Price Risk Swap [Line Items]
Commodity Swap Fixed Price	30.53
Ethane [Member] | Maximum [Member] | Year 2015 [Member]
Commodity Price Risk Swap [Line Items]
Commodity Swap Fixed Price	23.41
Propane [Member] | Year 2016 [Member]
Commodity Price Risk Swap [Line Items]
Commodity Swap Fixed Price	52.90
Propane [Member] | Minimum [Member] | Year 2014 [Member]
Commodity Price Risk Swap [Line Items]
Commodity Swap Fixed Price	40.38
Propane [Member] | Minimum [Member] | Year 2015 [Member]
Commodity Price Risk Swap [Line Items]
Commodity Swap Fixed Price	47.08
Propane [Member] | Maximum [Member] | Year 2014 [Member]
Commodity Price Risk Swap [Line Items]
Commodity Swap Fixed Price	53.78
Propane [Member] | Maximum [Member] | Year 2015 [Member]
Commodity Price Risk Swap [Line Items]
Commodity Swap Fixed Price	52.99
Isobutane [Member] | Year 2016 [Member]
Commodity Price Risk Swap [Line Items]
Commodity Swap Fixed Price	73.89
Isobutane [Member] | Minimum [Member] | Year 2014 [Member]
Commodity Price Risk Swap [Line Items]
Commodity Swap Fixed Price	61.24
Isobutane [Member] | Minimum [Member] | Year 2015 [Member]
Commodity Price Risk Swap [Line Items]
Commodity Swap Fixed Price	62.09
Isobutane [Member] | Maximum [Member] | Year 2014 [Member]
Commodity Price Risk Swap [Line Items]
Commodity Swap Fixed Price	75.13
Isobutane [Member] | Maximum [Member] | Year 2015 [Member]
Commodity Price Risk Swap [Line Items]
Commodity Swap Fixed Price	74.02
Normal Butane [Member] | Year 2016 [Member]
Commodity Price Risk Swap [Line Items]
Commodity Swap Fixed Price	64.93
Normal Butane [Member] | Minimum [Member] | Year 2014 [Member]
Commodity Price Risk Swap [Line Items]
Commodity Swap Fixed Price	53.89
Normal Butane [Member] | Minimum [Member] | Year 2015 [Member]
Commodity Price Risk Swap [Line Items]
Commodity Swap Fixed Price	54.62
Normal Butane [Member] | Maximum [Member] | Year 2014 [Member]
Commodity Price Risk Swap [Line Items]
Commodity Swap Fixed Price	66.83
Normal Butane [Member] | Maximum [Member] | Year 2015 [Member]
Commodity Price Risk Swap [Line Items]
Commodity Swap Fixed Price	65.04
Natural Gasoline [Member] | Year 2016 [Member]
Commodity Price Risk Swap [Line Items]
Commodity Swap Fixed Price	81.68
Natural Gasoline [Member] | Minimum [Member] | Year 2014 [Member]
Commodity Price Risk Swap [Line Items]
Commodity Swap Fixed Price	71.85
Natural Gasoline [Member] | Minimum [Member] | Year 2015 [Member]
Commodity Price Risk Swap [Line Items]
Commodity Swap Fixed Price	72.88
Natural Gasoline [Member] | Maximum [Member] | Year 2014 [Member]
Commodity Price Risk Swap [Line Items]
Commodity Swap Fixed Price	90.89
Natural Gasoline [Member] | Maximum [Member] | Year 2015 [Member]
Commodity Price Risk Swap [Line Items]
Commodity Swap Fixed Price	81.82
Condensate [Member] | Year 2016 [Member]
Commodity Price Risk Swap [Line Items]
Commodity Swap Fixed Price	81.68
Condensate [Member] | Minimum [Member] | Year 2014 [Member]
Commodity Price Risk Swap [Line Items]
Commodity Swap Fixed Price	75.22
Condensate [Member] | Minimum [Member] | Year 2015 [Member]
Commodity Price Risk Swap [Line Items]
Commodity Swap Fixed Price	76.47
Condensate [Member] | Maximum [Member] | Year 2014 [Member]
Commodity Price Risk Swap [Line Items]
Commodity Swap Fixed Price	87.30
Condensate [Member] | Maximum [Member] | Year 2015 [Member]
Commodity Price Risk Swap [Line Items]
Commodity Swap Fixed Price	81.82
Natural Gas (per MMbtu) [Member] | Year 2016 [Member]
Commodity Price Risk Swap [Line Items]
Commodity Swap Fixed Price	4.87
Natural Gas (per MMbtu) [Member] | Minimum [Member] | Year 2014 [Member]
Commodity Price Risk Swap [Line Items]
Commodity Swap Fixed Price	3.45
Natural Gas (per MMbtu) [Member] | Minimum [Member] | Year 2015 [Member]
Commodity Price Risk Swap [Line Items]
Commodity Swap Fixed Price	4.66
Natural Gas (per MMbtu) [Member] | Maximum [Member] | Year 2014 [Member]
Commodity Price Risk Swap [Line Items]
Commodity Swap Fixed Price	6.20
Natural Gas (per MMbtu) [Member] | Maximum [Member] | Year 2015 [Member]
Commodity Price Risk Swap [Line Items]
Commodity Swap Fixed Price	5.96

XML

Debt and Interest Expense - Debt Outstanding Table (details) (USD $) In Thousands, unless otherwise specified	Sep. 30, 2014		Dec. 31, 2013
Debt Instrument [Line Items]
Principal	$ 2,090,000		$ 1,420,000
Carrying Value	2,082,914		1,418,169	[1]
Fair Value	2,211,523	[2]	1,422,840	[2]
Revolving Credit Facility [Member]
Debt Instrument [Line Items]
Principal	170,000		0
Carrying Value	170,000		0
Fair Value	170,000	[2]	0	[2]
Senior Notes 5 Point 375 Percent Due 2021 [Member]
Debt Instrument [Line Items]
Principal	500,000		500,000
Carrying Value	495,576		495,173
Fair Value	557,828	[2]	533,615	[2]
Senior Notes 4 Percent Due 2022 [Member]
Debt Instrument [Line Items]
Principal	670,000		670,000
Carrying Value	673,017		673,278
Fair Value	690,811	[2]	641,237	[2]
Senior Notes 2 Point 6 Percent Due 2018 [Member]
Debt Instrument [Line Items]
Principal	350,000		250,000
Carrying Value	350,506		249,718
Fair Value	355,311	[2]	247,988	[2]
Senior Notes 5 Point 45 Percent Due 2044 [Member]
Debt Instrument [Line Items]
Principal	400,000		0
Carrying Value	393,815		0
Fair Value	$ 437,573	[2]	$ 0	[2]

[1] Financial information has been recast to include the financial position and results attributable to the TEFR Interests. See Note 1 and Note 2.

[2] Fair value is measured using Level 2 inputs.

XML

Components of Working Capital - Other Current Assets Table (details) (USD $) In Thousands, unless otherwise specified	Sep. 30, 2014		Dec. 31, 2013
Other Current Assets [Line Items]
Natural gas liquids inventory	$ 2,022		$ 2,584
Natural gas imbalance receivables	1,181		3,605
Prepaid insurance	2,521		2,123
Other	1,049		1,710
Total other current assets	$ 6,773	[1]	$ 10,022	[1],[2]

[1] Other current assets includes natural gas imbalance receivables from affiliates of $0.1 million as of September 30, 2014, and December 31, 2013.

[2] Financial information has been recast to include the financial position and results attributable to the TEFR Interests. See Note 1 and Note 2.

XML

Acquisitions - Impact to Historical Consolidated Statement of Income Table (details) (USD $) In Thousands, unless otherwise specified	3 Months Ended				9 Months Ended
	Sep. 30, 2014		Sep. 30, 2013		Sep. 30, 2014		Sep. 30, 2013
Revenues	$ 326,465		$ 273,502	[1]	$ 935,866		$ 750,670	[1]
Equity income, net	19,063	[2],[3]	4,520	[1],[2],[3]	41,322	[2],[3],[4]	11,944	[1],[2],[3],[4]
Net income (loss)	106,540		81,882	[1]	296,149		196,703	[1]
Texas Express And Front Range [Member]
Revenues			0				0
Equity income, net			21				(260)
Net income (loss)			106				(21)
Partnership Historical [Member]
Revenues			273,502				750,670
Equity income, net			4,499				12,204
Net income (loss)			$ 81,776				$ 196,724

[1] Financial information has been recast to include the financial position and results attributable to the TEFR Interests. See Note 1 and Note 2.

[2] Income earned from equity investments is classified as affiliate. See Note 1.

[3] Represents amounts earned or incurred on and subsequent to the date of acquisition of the Partnership assets, as well as amounts earned or incurred by Anadarko on a historical basis related to the Partnership assets prior to the acquisition of such assets, recognized under gathering, treating or processing agreements, and purchase and sale agreements.

[4] Income earned on, distributions from and contributions to equity investments are classified as affiliate. See Note 1.

XML

Transactions With Affiliates (tables)

9 Months Ended

Sep. 30, 2014

Related Party Fees and Other Arrangements, Limited Liability Company (LLC) or Limited Partnership (LP) [Abstract]

Commodity Price Swap Agreements Table

Below is a summary of the fixed price ranges on the Partnership’s outstanding commodity price swap agreements as of September 30, 2014:

per barrel except natural gas	2014					2015					2016
Ethane	$	18.36	−	$	30.53	$	18.41	−	$	23.41	$	23.11
Propane	40.38		−	53.78		47.08		−	52.99		52.90
Isobutane	61.24		−	75.13		62.09		−	74.02		73.89
Normal butane	53.89		−	66.83		54.62		−	65.04		64.93
Natural gasoline	71.85		−	90.89		72.88		−	81.82		81.68
Condensate	75.22		−	87.30		76.47		−	81.82		81.68
Natural gas (per MMBtu)	3.45		−	6.20		4.66		−	5.96		4.87

Gains (Losses) on Commodity Price Swap Agreements Table

The following table summarizes realized gains and losses on commodity price swap agreements:

	Three Months Ended   September 30,						Nine Months Ended   September 30,
thousands	2014			2013			2014			2013
Gains (losses) on commodity price swap agreements related to sales: (1)
Natural gas sales	$	3,179		$	6,923		$	1,525		$	14,707
Natural gas liquids sales	22,737			27,541			66,746			83,049
Total	25,916			34,464			68,271			97,756
Losses on commodity price swap agreements related to purchases (2)	(19,533		)	(23,902		)	(38,081		)	(66,613		)
Net gains (losses) on commodity price swap agreements	$	6,383		$	10,562		$	30,190		$	31,143

⁽¹⁾  Reported in affiliate natural gas, natural gas liquids and condensate sales in the consolidated statements of income in the period in which the related sale is recorded.

⁽²⁾  Reported in cost of product in the consolidated statements of income in the period in which the related purchase is recorded.

Related Party Transactions Tables

The following table summarizes the Partnership’s purchases from and sales to Anadarko of pipe and equipment:

	Nine Months Ended September 30,
	2014		2013		2014		2013
thousands	Purchases				Sales
Cash consideration	$	16,143	$	6,167	$	—	$	82
Net carrying value	9,745		2,039		—		34
Partners’ capital adjustment	$	6,398	$	4,128	$	—	$	48

The following table summarizes affiliate transactions, which include revenue from affiliates, reimbursement of operating expenses and purchases of natural gas:

	Three Months Ended   September 30,				Nine Months Ended   September 30,
thousands	2014		2013		2014		2013
Revenues (1)	$	245,500	$	213,125	$	708,456	$	591,010
Equity income, net	19,063		4,520		41,322		11,944
Cost of product (1)	22,728		33,753		74,592		97,801
Operation and maintenance (2)	14,556		13,469		42,472		41,021
General and administrative (3)	6,566		5,867		19,859		17,325
Operating expenses	43,850		53,089		136,923		156,147
Interest income, net (4)	4,225		4,225		12,675		12,675
Distributions to unitholders (5)	60,794		44,378		169,001		121,493

⁽¹⁾  Represents amounts recognized under gathering, treating or processing agreements, and purchase and sale agreements.

⁽²⁾  Represents expenses incurred on and subsequent to the date of the acquisition of the Partnership assets, as well as expenses incurred by Anadarko on a historical basis related to the Partnership assets prior to the acquisition of such assets by the Partnership.

⁽³⁾  Represents general and administrative expense incurred on and subsequent to the date of the Partnership’s acquisition of the Partnership assets, as well as a management services fee for reimbursement of expenses incurred by Anadarko for periods prior to the acquisition of the Partnership assets by the Partnership. These amounts include equity-based compensation expense allocated to the Partnership by Anadarko (see WES LTIP and WGP LTIP and Anadarko Incentive Plans within this Note 5).

⁽⁴⁾  Represents interest income recognized on the note receivable from Anadarko.

⁽⁵⁾  Represents distributions paid under the partnership agreement (see Note 3 and Note 4).

XML

Debt and Interest Expense - Interest Expense Table (details) (USD $) In Thousands, unless otherwise specified	3 Months Ended			9 Months Ended
	Sep. 30, 2014	Sep. 30, 2013		Sep. 30, 2014	Sep. 30, 2013
Debt Instruments [Abstract]
Interest expense on long-term debt	$ 21,671	$ 14,994		$ 59,251	$ 43,783
Amortization of debt issuance costs and commitment fees	1,107	1,135		3,799	3,252
Capitalized interest	(1,900)	(3,111)		(7,347)	(9,552)
Interest expense	$ 20,878	$ 13,018	[1]	$ 55,703	$ 37,483	[1]

[1] Financial information has been recast to include the financial position and results attributable to the TEFR Interests. See Note 1 and Note 2.

XML

Transactions With Affiliates - Summary Table (details) (USD $) In Thousands, unless otherwise specified	3 Months Ended								9 Months Ended
	Sep. 30, 2014		Jun. 30, 2014	Mar. 31, 2014	Sep. 30, 2013		Jun. 30, 2013	Mar. 31, 2013	Sep. 30, 2014		Sep. 30, 2013
Related Party Transaction [Line Items]
Revenues	$ 326,465				$ 273,502	[1]			$ 935,866		$ 750,670	[1]
Equity income, net	19,063	[2],[3]			4,520	[1],[2],[3]			41,322	[2],[3],[4]	11,944	[1],[2],[3],[4]
Cost of product	108,393	[5]			93,516	[1],[5]			318,428	[5]	270,059	[1],[5]
Operation and maintenance	53,657	[5]			42,757	[1],[5]			145,064	[5]	121,165	[1],[5]
General and administrative	7,889	[5]			7,276	[1],[5]			24,304	[5]	22,228	[1],[5]
Operating expenses	222,154				187,813	[1]			638,523		538,523	[1]
Interest income, net	4,225	[6]			4,225	[1],[6]			12,675	[6]	12,675	[1],[6]
Distributions to unitholders	111,609	[7]	105,655	98,749	83,986		79,315	70,143
Affiliated Entity [Member]
Related Party Transaction [Line Items]
Revenues	245,500	[2]			213,125	[1],[2]			708,456	[2]	591,010	[1],[2]
Cost of product	22,728	[2]			33,753	[2]			74,592	[2]	97,801	[2]
Operation and maintenance	14,556	[8]			13,469	[8]			42,472	[8]	41,021	[8]
General and administrative	6,566	[9]			5,867	[9]			19,859	[9]	17,325	[9]
Operating expenses	43,850				53,089				136,923		156,147
Distributions to unitholders	$ 60,794	[10]			$ 44,378	[10]			$ 169,001	[10]	$ 121,493	[10]

[1] Financial information has been recast to include the financial position and results attributable to the TEFR Interests. See Note 1 and Note 2.

[2] Represents amounts earned or incurred on and subsequent to the date of acquisition of the Partnership assets, as well as amounts earned or incurred by Anadarko on a historical basis related to the Partnership assets prior to the acquisition of such assets, recognized under gathering, treating or processing agreements, and purchase and sale agreements.

[3] Income earned from equity investments is classified as affiliate. See Note 1.

[4] Income earned on, distributions from and contributions to equity investments are classified as affiliate. See Note 1.

[5] Cost of product includes product purchases from Anadarko (as defined in Note 1) of $22.7 million and $74.6 million for the three and nine months ended September 30, 2014, respectively, and $33.8 million and $97.8 million for the three and nine months ended September 30, 2013, respectively. Operation and maintenance includes charges from Anadarko of $14.6 million and $42.5 million for the three and nine months ended September 30, 2014, respectively, and $13.5 million and $41.0 million for the three and nine months ended September 30, 2013, respectively. General and administrative includes charges from Anadarko of $6.6 million and $19.9 million for the three and nine months ended September 30, 2014, respectively, and $5.9 million and $17.3 million for the three and nine months ended September 30, 2013, respectively. See Note 5.

[6] Represents interest income recognized on the note receivable from Anadarko.

[7] On October 20, 2014, the board of directors of the Partnership’s general partner declared a cash distribution to the Partnership’s unitholders of $0.675 per unit, or $111.6 million in aggregate, including incentive distributions. The cash distribution is payable on November 13, 2014, to unitholders of record at the close of business on October 31, 2014.

[8] Represents expenses incurred on and subsequent to the date of the acquisition of the Partnership assets, as well as expenses incurred by Anadarko on a historical basis related to the Partnership assets prior to the acquisition of such assets.

[9] Represents general and administrative expense incurred on and subsequent to the date of the Partnership’s acquisition of the Partnership assets, as well as a management services fee for reimbursement of expenses incurred by Anadarko for periods prior to the acquisition of the Partnership assets by the Partnership. These amounts include equity-based compensation expense allocated to the Partnership by Anadarko (see WES LTIP and WGP LTIP and Anadarko Incentive Plans within this Note 5).

[10] Represents distributions paid under the partnership agreement (see Note 3 and Note 4).

XML

Equity and Partners' Capital - Limited Partner and General Partner Units (details)	9 Months Ended				1 Months Ended				9 Months Ended					12 Months Ended		1 Months Ended				9 Months Ended					12 Months Ended
	Sep. 30, 2014	Sep. 30, 2014 December 2013 Equity Offering [Member]	Sep. 30, 2014 Texas Express And Front Range [Member]	Sep. 30, 2014 Continuous Offering Program [Member]	Dec. 31, 2013 Common Units [Member]		May 31, 2013 Common Units [Member]		Sep. 30, 2014 Common Units [Member]	Sep. 30, 2014 Common Units [Member] December 2013 Equity Offering [Member]	Sep. 30, 2014 Common Units [Member] Texas Express And Front Range [Member]	Sep. 30, 2014 Common Units [Member] Continuous Offering Program [Member]		Dec. 31, 2013 Common Units [Member] Continuous Offering Program [Member]		Dec. 31, 2013 General Partner [Member]		May 31, 2013 General Partner [Member]		Sep. 30, 2014 General Partner [Member]	Sep. 30, 2014 General Partner [Member] December 2013 Equity Offering [Member]	Sep. 30, 2014 General Partner [Member] Texas Express And Front Range [Member]	Sep. 30, 2014 General Partner [Member] Continuous Offering Program [Member]		Dec. 31, 2013 General Partner [Member] Continuous Offering Program [Member]
Capital Unit [Line Items]
Balance	119,717,157								117,322,812											2,394,345
Common units issued					4,800,000	[1]	7,015,000	[2]		300,000		1,133,384	[3]	685,735	[4]
Offering		306,122		1,156,516												97,959	[1],[5]	143,163	[2],[5]		6,122		23,132	[3],[5]	13,996	[4],[5]
Long-term incentive plan awards	5,530								5,418											112
Acquisition			314,786								308,490											6,296
Balance	121,500,111				117,322,812				119,070,104							2,394,345				2,430,007

[1] Includes the issuance of 300,000 common units on January 3, 2014, pursuant to the partial exercise of the underwriters’ over-allotment option granted in connection with the December 2013 equity offering. Net proceeds from this partial exercise (including the general partner’s proportionate capital contribution) were $18.1 million.

[2] Includes the issuance of 915,000 common units pursuant to the full exercise of the underwriters’ over-allotment option granted in connection with the May 2013 equity offering.

[3] Represents common and general partner units issued during the nine months ended September 30, 2014, under the Continuous Offering Program. Gross proceeds generated (including the general partner’s proportionate capital contributions) were $85.0 million. The price per unit in the table above represents an average price for all issuances under the Continuous Offering Program during the nine months ended September 30, 2014. As of September 30, 2014, the Partnership had used all the capacity to issue common units under this registration statement.

[4] Represents common and general partner units issued during the year ended December 31, 2013, pursuant to the Partnership’s registration statement filed with the SEC in August 2012 authorizing the issuance of up to an aggregate of $125.0 million of common units (the “Continuous Offering Program”). Gross proceeds generated (including the general partner’s proportionate capital contributions) during the year ended December 31, 2013, were $42.6 million. The price per unit in the table above represents an average price for all issuances under the Continuous Offering Program during 2013.

[5] Represents general partner units issued to the general partner in exchange for the general partner’s proportionate capital contribution to maintain its 2.0% general partner interest in the Partnership.

XML

Commitments and Contingencies - Additional Information (details) (USD $) In Millions, unless otherwise specified	3 Months Ended		9 Months Ended
	Sep. 30, 2014	Sep. 30, 2013	Sep. 30, 2014	Sep. 30, 2013
Commitments and Contingencies Disclosure [Abstract]
Committed capital	$ 70.5		$ 70.5
Rent expense associated with office and equipment leases	$ 0.7	$ 0.6	$ 2.2	$ 2.0

XML

Components of Working Capital - Accrued Liabilities Table (details) (USD $) In Thousands, unless otherwise specified	Sep. 30, 2014		Dec. 31, 2013
Accrued Liabilities [Line Items]
Other accrued liabilities	$ 186		$ 218
Accrued interest expense	28,525		18,119
Short-term asset retirement obligations	483		1,966
Short-term remediation and reclamation obligations	562		562
Total accrued liabilities	152,878	[1]	137,011	[1],[2]
Accrued Capital Expenditures [Member]
Accrued Liabilities [Line Items]
Other accrued liabilities	92,559		94,750
Accrued Plant Purchases [Member]
Accrued Liabilities [Line Items]
Other accrued liabilities	$ 30,563		$ 21,396

[1] Accrued liabilities includes amounts payable to affiliates of zero and $0.1 million as of September 30, 2014, and December 31, 2013, respectively.

[2] Financial information has been recast to include the financial position and results attributable to the TEFR Interests. See Note 1 and Note 2.

XML

Consolidated Statements of Cash Flows (Parenthetical) (USD $) In Thousands, unless otherwise specified	9 Months Ended
	Sep. 30, 2014
Capital lease asset transfer	$ 4,833	[1]
Other Current Assets [Member]
Capital lease asset transfer	200
Other Noncurrent Assets [Member]
Capital lease asset transfer	$ 4,600

[1] For the nine months ended September 30, 2014, represents transfers of $0.2 million and $4.6 million from other current assets and other long-term assets, respectively, associated with the capital lease components of a processing agreement. See Note 6.

XML

Transactions With Affiliates - Additional Information (details) (USD $)	9 Months Ended			3 Months Ended		9 Months Ended		3 Months Ended		9 Months Ended			1 Months Ended	9 Months Ended		3 Months Ended		9 Months Ended		3 Months Ended		9 Months Ended
	Sep. 30, 2014	Dec. 31, 2013		Sep. 30, 2014 Western Gas Partners Long Term Incentive Plan [Member]	Sep. 30, 2013 Western Gas Partners Long Term Incentive Plan [Member]	Sep. 30, 2014 Western Gas Partners Long Term Incentive Plan [Member]	Sep. 30, 2013 Western Gas Partners Long Term Incentive Plan [Member]	Sep. 30, 2014 Western Gas Equity Partners Long Term Incentive Plan [Member] Anadarko Incentive Plans [Member]	Sep. 30, 2013 Western Gas Equity Partners Long Term Incentive Plan [Member] Anadarko Incentive Plans [Member]	Sep. 30, 2014 Western Gas Equity Partners Long Term Incentive Plan [Member] Anadarko Incentive Plans [Member]	Sep. 30, 2013 Western Gas Equity Partners Long Term Incentive Plan [Member] Anadarko Incentive Plans [Member]	Sep. 30, 2014 Independent Director [Member] Western Gas Partners Long Term Incentive Plan [Member]	May 31, 2008 Note Receivable From Anadarko [Member]	Sep. 30, 2014 Note Receivable From Anadarko [Member]	Dec. 31, 2013 Note Receivable From Anadarko [Member]	Sep. 30, 2014 Gathering Transportation And Treating [Member]	Sep. 30, 2013 Gathering Transportation And Treating [Member]	Sep. 30, 2014 Gathering Transportation And Treating [Member]	Sep. 30, 2013 Gathering Transportation And Treating [Member]	Sep. 30, 2014 Processing [Member]	Sep. 30, 2013 Processing [Member]	Sep. 30, 2014 Processing [Member]	Sep. 30, 2013 Processing [Member]
Related Party Transaction [Line Items]
Note receivable - Anadarko	$ 260,000,000	$ 260,000,000	[1]										$ 260,000,000.0
Note receivable, due date														May 14, 2038
Fixed annual rate for note receivable bearing interest													6.50%
Fair value of the note receivable														322,300,000	296,700,000
Affiliate throughput percent																47.00%	53.00%	48.00%	55.00%	58.00%	60.00%	58.00%	59.00%
Phantom units vesting period						3 years						1 year
Equity-based compensation expense				200,000	100,000	500,000	400,000	900,000	800,000	2,700,000	2,200,000
Partners' capital adjustment	$ 628,000									$ 2,500,000

[1] Financial information has been recast to include the financial position and results attributable to the TEFR Interests. See Note 1 and Note 2.

XML

Description of Business and Basis of Presentation - Asset Table (details)	Sep. 30, 2014 unit
Operated [Member] | Natural Gas Gathering Systems [Member]
Assets [Line Items]
Assets, number of units	13
Operated [Member] | Natural Gas Treating Facilities [Member]
Assets [Line Items]
Assets, number of units	8
Operated [Member] | Natural Gas Processing Facilities [Member]
Assets [Line Items]
Assets, number of units	9
Operated [Member] | Natural Gas Liquids Pipelines [Member]
Assets [Line Items]
Assets, number of units	3
Operated [Member] | Natural Gas Pipelines [Member]
Assets [Line Items]
Assets, number of units	3
Operated Interests [Member] | Natural Gas Gathering Systems [Member]
Assets [Line Items]
Assets, number of units	1
Operated Interests [Member] | Natural Gas Processing Facilities [Member]
Assets [Line Items]
Assets, number of units	3
Non-Operated Interests [Member] | Natural Gas Gathering Systems [Member]
Assets [Line Items]
Assets, number of units	5
Equity Interests [Member] | Natural Gas Gathering Systems [Member]
Assets [Line Items]
Assets, number of units	2
Equity Interests [Member] | Natural Gas Liquids Gathering Systems [Member]
Assets [Line Items]
Assets, number of units	2
Equity Interests [Member] | Natural Gas Treating Facilities [Member]
Assets [Line Items]
Assets, number of units	1
Equity Interests [Member] | Natural Gas Processing Facilities [Member]
Assets [Line Items]
Assets, number of units	2
Equity Interests [Member] | Natural Gas Liquids Pipelines [Member]
Assets [Line Items]
Assets, number of units	2
Equity Interests [Member] | Oil pipeline [Member]
Assets [Line Items]
Assets, number of units	1

XML

Debt and Interest Expense (tables)

9 Months Ended

Sep. 30, 2014

Debt Instruments [Abstract]

Debt Outstanding and Debt Activity Tables

The following table presents the Partnership’s outstanding debt as of September 30, 2014, and December 31, 2013:

	September 30, 2014						December 31, 2013
thousands	Principal		Carrying Value		Fair Value(1)		Principal		Carrying Value		Fair Value (1)
5.375% Senior Notes due 2021	$	500,000	$	495,576	$	557,828	$	500,000	$	495,173	$	533,615
4.000% Senior Notes due 2022	670,000		673,017		690,811		670,000		673,278		641,237
Revolving credit facility	170,000		170,000		170,000		—		—		—
2.600% Senior Notes due 2018	350,000		350,506		355,311		250,000		249,718		247,988
5.450% Senior Notes due 2044	400,000		393,815		437,573		—		—		—
Total debt outstanding	$	2,090,000	$	2,082,914	$	2,211,523	$	1,420,000	$	1,418,169	$	1,422,840

⁽¹⁾  Fair value is measured using Level 2 inputs.

Debt activity. The following table presents the debt activity of the Partnership for the nine months ended September 30, 2014:

thousands	Carrying Value
Balance at December 31, 2013	$	1,418,169
Revolving credit facility borrowings	650,000
Issuance of 5.450% Senior Notes due 2044	400,000
Issuance of 2.600% Senior Notes due 2018	100,000
Repayments of revolving credit facility	(480,000		)
Other	(5,255		)
Balance at September 30, 2014	$	2,082,914

Interest Expense Table

The following table summarizes the amounts included in interest expense:

	Three Months Ended   September 30,						Nine Months Ended   September 30,
thousands	2014			2013			2014			2013
Interest expense on long-term debt	$	21,671		$	14,994		$	59,251		$	43,783
Amortization of debt issuance costs and commitment fees	1,107			1,135			3,799			3,252
Capitalized interest	(1,900		)	(3,111		)	(7,347		)	(9,552		)
Interest expense	$	20,878		$	13,018		$	55,703		$	37,483

XML

Property, Plant and Equipment Table (details) (USD $) In Thousands, unless otherwise specified								9 Months Ended				9 Months Ended						9 Months Ended
	Sep. 30, 2014	Dec. 31, 2013		Sep. 30, 2014 Land [Member]	Dec. 31, 2013 Land [Member]	Sep. 30, 2014 Gathering Systems [Member]	Dec. 31, 2013 Gathering Systems [Member]	Sep. 30, 2014 Gathering Systems [Member] Minimum [Member]	Sep. 30, 2014 Gathering Systems [Member] Maximum [Member]	Sep. 30, 2014 Pipelines And Equipment [Member]	Dec. 31, 2013 Pipelines And Equipment [Member]	Sep. 30, 2014 Pipelines And Equipment [Member] Minimum [Member]	Sep. 30, 2014 Pipelines And Equipment [Member] Maximum [Member]	Sep. 30, 2014 Assets Under Construction [Member]	Dec. 31, 2013 Assets Under Construction [Member]	Sep. 30, 2014 Other [Member]	Dec. 31, 2013 Other [Member]	Sep. 30, 2014 Other [Member] Minimum [Member]	Sep. 30, 2014 Other [Member] Maximum [Member]
Property, Plant and Equipment [Line Items]
Property, plant and equipment	$ 4,754,279	$ 4,239,100	[1]	$ 2,584	$ 2,584	$ 4,244,640	$ 3,673,008			$ 145,851	$ 146,008			$ 345,799	$ 405,633	$ 15,405	$ 11,867
Accumulated depreciation	986,692	855,845	[1]
Net property, plant and equipment	$ 3,767,587	$ 3,383,255	[1]
Estimated useful life								3 years	47 years			15 years	45 years					3 years	40 years

[1] Financial information has been recast to include the financial position and results attributable to the TEFR Interests. See Note 1 and Note 2.

XML

Description of Business and Basis of Presentation - Equity Investments Table (details) (USD $) In Thousands, unless otherwise specified	3 Months Ended				9 Months Ended
	Sep. 30, 2014		Sep. 30, 2013		Sep. 30, 2014		Sep. 30, 2013
Schedule of Equity Method Investments [Line Items]
Balance					$ 593,400	[1]
Investment earnings (loss), net of amortization	19,063	[2],[3]	4,520	[1],[2],[3]	41,322	[2],[3],[4]	11,944	[1],[2],[3],[4]
Contributions					63,267		252,308	[1]
Capitalized interest					857
Distributions					(43,061)	[4]	(15,563)	[1],[4]
Distributions in excess of cumulative earnings					(14,387)	[4],[5]	0	[1],[4]
Balance	639,191				639,191
Fort Union [Member]
Schedule of Equity Method Investments [Line Items]
Balance					25,172
Investment earnings (loss), net of amortization					4,811
Contributions					0
Capitalized interest					0
Distributions					(4,619)
Distributions in excess of cumulative earnings					0	[5]
Balance	25,364				25,364
White Cliffs [Member]
Schedule of Equity Method Investments [Line Items]
Balance					35,039
Investment earnings (loss), net of amortization					8,385
Contributions					10,456
Capitalized interest					0
Distributions					(7,949)
Distributions in excess of cumulative earnings					(891)	[5]
Balance	45,040				45,040
Rendezvous [Member]
Schedule of Equity Method Investments [Line Items]
Balance					60,928
Investment earnings (loss), net of amortization					1,180
Contributions					0
Capitalized interest					0
Distributions					(2,636)
Distributions in excess of cumulative earnings					(1,993)	[5]
Balance	57,479				57,479
Mont Belvieu Joint Venture [Member]
Schedule of Equity Method Investments [Line Items]
Balance					122,480
Investment earnings (loss), net of amortization					22,872
Contributions					3,956
Capitalized interest					0
Distributions					(24,423)
Distributions in excess of cumulative earnings					0	[5]
Balance	124,885				124,885
Texas Express Gathering Limited Liability Company [Member]
Schedule of Equity Method Investments [Line Items]
Balance					16,649
Investment earnings (loss), net of amortization					466
Contributions					352
Capitalized interest					0
Distributions					(373)
Distributions in excess of cumulative earnings					(338)	[5]
Balance	16,756				16,756
Texas Express Pipeline Limited Liability Company [Member]
Schedule of Equity Method Investments [Line Items]
Balance					197,731
Investment earnings (loss), net of amortization					3,488
Contributions					6,263
Capitalized interest					0
Distributions					(2,938)
Distributions in excess of cumulative earnings					(5,321)	[5]
Balance	199,223				199,223
Front Range Pipeline Limited Liability Company [Member]
Schedule of Equity Method Investments [Line Items]
Balance					135,401
Investment earnings (loss), net of amortization					120
Contributions					40,033
Capitalized interest					857
Distributions					(123)
Distributions in excess of cumulative earnings					(5,844)	[5]
Balance	170,444				170,444
Equity Investments [Member]
Schedule of Equity Method Investments [Line Items]
Contributions					$ 61,060

[1] Financial information has been recast to include the financial position and results attributable to the TEFR Interests. See Note 1 and Note 2.

[2] Income earned from equity investments is classified as affiliate. See Note 1.

[3] Represents amounts earned or incurred on and subsequent to the date of acquisition of the Partnership assets, as well as amounts earned or incurred by Anadarko on a historical basis related to the Partnership assets prior to the acquisition of such assets, recognized under gathering, treating or processing agreements, and purchase and sale agreements.

[4] Income earned on, distributions from and contributions to equity investments are classified as affiliate. See Note 1.

[5] Distributions in excess of cumulative earnings, classified as investing cash flows in the consolidated statements of cash flows, is calculated on an individual investment basis.

XML

Description of Business and Basis of Presentation - Additional Information (details)	9 Months Ended
	Sep. 30, 2014
General partner's interest	2.00%
Western Gas Equity Partners [Member]
General partner's interest	2.00%
Ownership interest	100.00%
Incentive Distribution Rights [Member] | Western Gas Equity Partners [Member]
General partner's interest	100.00%
Fort Union [Member]
Equity investment ownership	14.81%
Rendezvous [Member]
Equity investment ownership	22.00%
White Cliffs [Member]
Equity investment ownership	10.00%
Mont Belvieu Joint Venture [Member]
Equity investment ownership	25.00%
Texas Express Pipeline Limited Liability Company [Member]
Equity investment ownership	20.00%
Texas Express Gathering Limited Liability Company [Member]
Equity investment ownership	20.00%
Front Range Pipeline Limited Liability Company [Member]
Equity investment ownership	33.33%
Non-Operated Marcellus Interest [Member]
Ownership interest	33.75%
Anadarko-Operated Marcellus Interest [Member]
Ownership interest	33.75%
Newcastle [Member]
Ownership interest	50.00%
Chipeta Processing Limited Liability Company [Member]
Ownership interest by noncontrolling owner	25.00%

XML

Consolidated Statements of Cash Flows (USD $) In Thousands, unless otherwise specified	9 Months Ended
	Sep. 30, 2014		Sep. 30, 2013
Cash flows from operating activities
Net income	$ 296,149		$ 196,703	[1]
Adjustments to reconcile net income to net cash provided by operating activities:
Depreciation, amortization and impairments	130,009		106,551	[1]
Non-cash equity-based compensation expense	3,210		2,564	[1]
Deferred income taxes	642		29,216	[1]
Debt-related amortization and other items, net	2,045		1,756	[1]
Equity income, net	(41,322)	[2],[3],[4]	(11,944)	[1],[2],[3],[4]
Distributions from equity investment earnings	43,061	[2]	15,563	[1],[2]
Changes in assets and liabilities:
(Increase) decrease in accounts receivable, net	(41,408)		(27,387)	[1]
Increase (decrease) in accounts and natural gas imbalance payables and accrued liabilities, net	9,736		6,818	[1]
Change in other items, net	1,645		(2,523)	[1]
Net cash provided by operating activities	403,767		317,317	[1]
Cash flows from investing activities
Capital expenditures	(492,287)		(469,678)	[1]
Investments in equity affiliates	(63,267)		(252,308)	[1]
Distributions from equity investments in excess of cumulative earnings	14,387	[2],[5]	0	[1],[2]
Net cash used in investing activities	(913,372)		(1,432,048)	[1]
Cash flows from financing activities
Borrowings, net of debt issuance costs	1,136,878		842,566	[1]
Repayments of debt	(480,000)		(495,000)	[1]
Increase (decrease) in outstanding checks	2,908		(3,335)	[1]
Proceeds from the issuance of common and general partner units, net of offering expenses	101,502		427,848	[1]
Distributions to unitholders	(297,013)		(215,115)	[1]
Contributions from noncontrolling interest owner	0		2,247	[1]
Distributions to noncontrolling interest owner	(11,349)		(8,001)	[1]
Net contributions from Anadarko	23,788		181,904	[1]
Net cash provided by financing activities	476,714		733,114	[1]
Net increase (decrease) in cash and cash equivalents	(32,891)		(381,617)	[1]
Cash and cash equivalents at beginning of period	100,728	[1]	419,981	[1]
Cash and cash equivalents at end of period	67,837		38,364	[1]
Supplemental disclosures
Net distributions to Anadarko of other assets	6,398		4,080	[1]
Interest paid, net of capitalized interest	43,504		34,974	[1]
Taxes paid (reimbursements received)	(340)		0	[1]
Capital lease asset transfer	4,833	[6]	0	[1],[6]
Affiliated Entity [Member]
Cash flows from investing activities
Contributions in aid of construction costs from affiliates	183		0	[1]
Acquisitions	(372,393)		(469,884)	[1]
Proceeds from the sale of assets	0		82	[1]
Third Parties [Member]
Cash flows from investing activities
Acquisitions	0		(240,274)	[1]
Proceeds from the sale of assets	$ 5		$ 14	[1]

[1] Financial information has been recast to include the financial position and results attributable to the TEFR Interests. See Note 1 and Note 2.

[2] Income earned on, distributions from and contributions to equity investments are classified as affiliate. See Note 1.

[3] Income earned from equity investments is classified as affiliate. See Note 1.

[4] Represents amounts earned or incurred on and subsequent to the date of acquisition of the Partnership assets, as well as amounts earned or incurred by Anadarko on a historical basis related to the Partnership assets prior to the acquisition of such assets, recognized under gathering, treating or processing agreements, and purchase and sale agreements.

[5] Distributions in excess of cumulative earnings, classified as investing cash flows in the consolidated statements of cash flows, is calculated on an individual investment basis.

[6] For the nine months ended September 30, 2014, represents transfers of $0.2 million and $4.6 million from other current assets and other long-term assets, respectively, associated with the capital lease components of a processing agreement. See Note 6.

XML

Acquisitions - Acquisitions Table (details) (USD $)	9 Months Ended				0 Months Ended			0 Months Ended			0 Months Ended					0 Months Ended								0 Months Ended
	Sep. 30, 2014	Sep. 30, 2013		Dec. 31, 2013	Mar. 01, 2013 Non-Operated Marcellus Interest [Member]		Mar. 01, 2013 Non-Operated Marcellus Interest [Member]	Mar. 08, 2013 Anadarko-Operated Marcellus Interest [Member]		Mar. 08, 2013 Anadarko-Operated Marcellus Interest [Member]	Jun. 05, 2013 Mont Belvieu Joint Venture [Member]		Jun. 05, 2013 Mont Belvieu Joint Venture [Member]		Jun. 05, 2013 Mont Belvieu Joint Venture [Member] Fractionator [Member] unit	Sep. 03, 2013 Overland Trail Transmission Limited Liability Company [Member]		Mar. 03, 2014 Texas Express And Front Range [Member]		Mar. 03, 2014 Texas Express And Front Range [Member]	Mar. 03, 2014 Texas Express Gathering Limited Liability Company [Member]	Mar. 03, 2014 Texas Express Pipeline Limited Liability Company [Member]	Mar. 03, 2014 Front Range Pipeline Limited Liability Company [Member]	Mar. 01, 2013 Common Units [Member] Non-Operated Marcellus Interest [Member]		Mar. 03, 2014 Common Units [Member] Texas Express And Front Range [Member]
Business Acquisition [Line Items]
Percentage acquired					33.75%	[1]		33.75%	[2]							100.00%	[3]
Equity investment ownership													25.00%	[4]							20.00%	20.00%	33.33%
Borrowings	$ 1,136,878,000	$ 842,566,000	[5]		$ 250,000,000	[1]		$ 133,500,000	[2]							$ 27,500,000	[3]	$ 350,000,000	[6]
Cash on hand					215,500,000	[1]					78,129,000	[4]						6,250,000	[6]
Units issued																								449,129	[1]	308,490	[6]
Table Text Block Supplement [Abstract]
General partner units issued				2,394,345			9,166													6,296
Proceeds from the issuance of common and general partner units, net of offering expenses	101,502,000	427,848,000	[5]		500,000													400,000
General partner's interest	2.00%				2.00%
Purchase price adjustment										$ 1,100,000
Assets, number of units															2

[1] The Partnership acquired Anadarko’s 33.75% interest (non-operated) in the Liberty and Rome gas gathering systems, serving production from the Marcellus shale in north-central Pennsylvania. The interest acquired is referred to as the “Non-Operated Marcellus Interest.” In connection with the issuance of the common units, the Partnership’s general partner purchased 9,166 general partner units for consideration of $0.5 million to maintain its 2.0% general partner interest in the Partnership.

[2] The Partnership acquired a 33.75% interest in each of the Larry’s Creek, Seely and Warrensville gas gathering systems, which are operated by Anadarko and serve production from the Marcellus shale in north-central Pennsylvania, from a third party. The interest acquired is referred to as the “Anadarko-Operated Marcellus Interest.” During the third quarter of 2013, the Partnership recorded a $1.1 million decrease in the assets acquired and liabilities assumed in the acquisition, representing the final purchase price allocation.

[3] The Partnership acquired Overland Trail Transmission, LLC (“OTTCO”), a Delaware limited liability company, from a third party. OTTCO owns and operates an intrastate pipeline that connects the Partnership’s Red Desert and Granger complexes in southwestern Wyoming.

[4] The Partnership acquired a 25% interest in the Mont Belvieu JV, an entity formed to design, construct, and own two fractionation trains located in Mont Belvieu, Texas, from a third party. The interest acquired is accounted for under the equity method of accounting.

[5] Financial information has been recast to include the financial position and results attributable to the TEFR Interests. See Note 1 and Note 2.

[6] The Partnership acquired a 20% interest in each of TEG and TEP and a 33.33% interest in FRP from Anadarko. These assets gather and transport NGLs primarily from the Anadarko and Denver-Julesburg Basins. The interests in these entities are accounted for under the equity method of accounting. In connection with the issuance of the common units, the Partnership’s general partner purchased 6,296 general partner units for consideration of $0.4 million to maintain its 2.0% general partner interest in the Partnership.

XML

Transactions With Affiliates - Gains Losses Commodity Price Swap Table (details) (USD $) In Thousands, unless otherwise specified	3 Months Ended				9 Months Ended
	Sep. 30, 2014		Sep. 30, 2013		Sep. 30, 2014		Sep. 30, 2013
Gains (losses) on commodity price swap
Net gains (losses) on commodity price swap agreements	$ 6,383		$ 10,562		$ 30,190		$ 31,143
Sales [Member]
Gains (losses) on commodity price swap
Net gains (losses) on commodity price swap agreements	25,916	[1]	34,464	[1]	68,271	[1]	97,756	[1]
Sales [Member] | Natural Gas [Member]
Gains (losses) on commodity price swap
Net gains (losses) on commodity price swap agreements	3,179	[1]	6,923	[1]	1,525	[1]	14,707	[1]
Sales [Member] | Natural Gas Liquids [Member]
Gains (losses) on commodity price swap
Net gains (losses) on commodity price swap agreements	22,737	[1]	27,541	[1]	66,746	[1]	83,049	[1]
Cost of Sales [Member]
Gains (losses) on commodity price swap
Net gains (losses) on commodity price swap agreements	$ (19,533)	[2]	$ (23,902)	[2]	$ (38,081)	[2]	$ (66,613)	[2]

[1] Reported in affiliate natural gas, natural gas liquids and condensate sales in the consolidated statements of income in the period in which the related sale is recorded.

[2] Reported in cost of product in the consolidated statements of income in the period in which the related purchase is recorded.

XML

Subsequent Event (Details) (Subsequent Event [Member], Nuevo Midstream, LLC [Member], USD $)	0 Months Ended
	Oct. 28, 2014
Subsequent Event [Line Items]
Cash consideration	$ 1,500,000,000
Minimum [Member]
Subsequent Event [Line Items]
Percentage acquired	50.00%
Maximum [Member]
Subsequent Event [Line Items]
Percentage acquired	100.00%
Redeemable Convertible Preferred Stock [Member]
Subsequent Event [Line Items]
Class C unit proceeds	$ 750,000,000

XML

Consolidated Statements of Income (USD $) In Thousands, except Per Share data, unless otherwise specified	3 Months Ended				9 Months Ended
	Sep. 30, 2014		Sep. 30, 2013		Sep. 30, 2014		Sep. 30, 2013
Revenues
Total revenues	$ 326,465		$ 273,502	[1]	$ 935,866		$ 750,670	[1]
Equity income, net	19,063	[2],[3]	4,520	[1],[2],[3]	41,322	[2],[3],[4]	11,944	[1],[2],[3],[4]
Operating expenses
Cost of product	108,393	[5]	93,516	[1],[5]	318,428	[5]	270,059	[1],[5]
Operation and maintenance	53,657	[5]	42,757	[1],[5]	145,064	[5]	121,165	[1],[5]
General and administrative	7,889	[5]	7,276	[1],[5]	24,304	[5]	22,228	[1],[5]
Property and other taxes	6,564		6,649	[1]	20,718		18,520	[1]
Depreciation, amortization and impairments	45,651		37,615	[1]	130,009		106,551	[1]
Total operating expenses	222,154		187,813	[1]	638,523		538,523	[1]
Operating income	123,374		90,209	[1]	338,665		224,091	[1]
Interest income, net - affiliates	4,225	[6]	4,225	[1],[6]	12,675	[6]	12,675	[1],[6]
Interest expense	(20,878)		(13,018)	[1]	(55,703)		(37,483)	[1]
Other income (expense), net	97		439	[1]	788		1,612	[1]
Income before income taxes	106,818		81,855	[1]	296,425		200,895	[1]
Income tax (benefit) expense	278		(27)	[1]	276		4,192	[1]
Net income	106,540		81,882	[1]	296,149		196,703	[1]
Net income attributable to noncontrolling interest	3,863		3,376	[1]	11,005		7,467	[1]
Net income attributable to Western Gas Partners, LP	102,677		78,506	[1]	285,144		189,236	[1]
Limited partners' interest in net income:
Pre-acquisition net (income) loss allocated to Anadarko	0		(106)	[1]	956		(4,616)	[1]
General partner interest in net (income) loss	(31,058)	[7]	(18,693)	[1],[7]	(83,939)	[7]	(47,733)	[1],[7]
Limited partners' interest in net income	71,619	[7]	59,707	[1],[7]	202,161	[7]	136,887	[1],[7]
Affiliated Entity [Member]
Revenues
Gathering, processing and transportation of natural gas and natural gas liquids	104,258		83,606	[1]	288,392		218,680	[1]
Natural gas, natural gas liquids and condensate sales	138,464		129,411	[1]	415,715		371,077	[1]
Other, net	2,778		108	[1]	4,349		1,253	[1]
Total revenues	245,500	[2]	213,125	[1],[2]	708,456	[2]	591,010	[1],[2]
Operating expenses
Cost of product	22,728	[2]	33,753	[2]	74,592	[2]	97,801	[2]
Operation and maintenance	14,556	[8]	13,469	[8]	42,472	[8]	41,021	[8]
General and administrative	6,566	[9]	5,867	[9]	19,859	[9]	17,325	[9]
Total operating expenses	43,850		53,089		136,923		156,147
Third Parties [Member]
Revenues
Gathering, processing and transportation of natural gas and natural gas liquids	64,098		47,175	[1]	182,663		124,791	[1]
Natural gas, natural gas liquids and condensate sales	11,630		11,915	[1]	37,471		31,539	[1]
Other, net	5,237		1,287	[1]	7,276		3,330	[1]
Total revenues	$ 80,965		$ 60,377	[1]	$ 227,410		$ 159,660	[1]
Limited Partner [Member] | Common Units [Member]
Limited partners' interest in net income:
Net income per common unit - basic and diluted	$ 0.60		$ 0.53	[1]	$ 1.71		$ 1.26	[1]
Weighted average common units outstanding - basic and diluted	119,068		112,143	[1]	118,326		108,540	[1]

[1] Financial information has been recast to include the financial position and results attributable to the TEFR Interests. See Note 1 and Note 2.

[2] Represents amounts earned or incurred on and subsequent to the date of acquisition of the Partnership assets, as well as amounts earned or incurred by Anadarko on a historical basis related to the Partnership assets prior to the acquisition of such assets, recognized under gathering, treating or processing agreements, and purchase and sale agreements.

[3] Income earned from equity investments is classified as affiliate. See Note 1.

[4] Income earned on, distributions from and contributions to equity investments are classified as affiliate. See Note 1.

[5] Cost of product includes product purchases from Anadarko (as defined in Note 1) of $22.7 million and $74.6 million for the three and nine months ended September 30, 2014, respectively, and $33.8 million and $97.8 million for the three and nine months ended September 30, 2013, respectively. Operation and maintenance includes charges from Anadarko of $14.6 million and $42.5 million for the three and nine months ended September 30, 2014, respectively, and $13.5 million and $41.0 million for the three and nine months ended September 30, 2013, respectively. General and administrative includes charges from Anadarko of $6.6 million and $19.9 million for the three and nine months ended September 30, 2014, respectively, and $5.9 million and $17.3 million for the three and nine months ended September 30, 2013, respectively. See Note 5.

[6] Represents interest income recognized on the note receivable from Anadarko.

[7] Represents net income earned on and subsequent to the date of acquisition of the Partnership assets (as defined in Note 1). See Note 4.

[8] Represents expenses incurred on and subsequent to the date of the acquisition of the Partnership assets, as well as expenses incurred by Anadarko on a historical basis related to the Partnership assets prior to the acquisition of such assets.

[9] Represents general and administrative expense incurred on and subsequent to the date of the Partnership’s acquisition of the Partnership assets, as well as a management services fee for reimbursement of expenses incurred by Anadarko for periods prior to the acquisition of the Partnership assets by the Partnership. These amounts include equity-based compensation expense allocated to the Partnership by Anadarko (see WES LTIP and WGP LTIP and Anadarko Incentive Plans within this Note 5).

XML

Property, Plant and Equipment - Additional Information (details) (USD $)	3 Months Ended					3 Months Ended	9 Months Ended	3 Months Ended
	Mar. 31, 2014	Sep. 30, 2014	Dec. 31, 2013		Jun. 30, 2014 Natural Gas Processing Plant [Member]	Sep. 30, 2014 Non-Operated Marcellus Interest [Member]	Sep. 30, 2014 Non-Operated Marcellus Interest [Member]	Sep. 30, 2014 Hilight System [Member]	Mar. 31, 2014 Equipment [Member]
Property, Plant and Equipment [Line Items]
Unguaranteed residual value			$ 4,600,000
Property, plant and equipment		4,754,279,000	4,239,100,000	[1]	4,600,000
Impairment	1,200,000					400,000	700,000	500,000
Estimated fair value									$ 2,400,000

[1] Financial information has been recast to include the financial position and results attributable to the TEFR Interests. See Note 1 and Note 2.

XML

Consolidated Statement of Equity and Partners' Capital (USD $) In Thousands		Total	Net Investment by Anadarko [Member]	Common Units [Member]	General Partner Units [Member]	Noncontrolling Interest [Member]
Balance at Dec. 31, 2013	[1]	$ 2,892,036	$ 312,092	$ 2,431,193	$ 78,157	$ 70,594
Net income (loss)		296,149	(956)	202,161	83,939	11,005
Issuance of common and general partner units, net of offering expenses		101,741		99,274	2,467
Distributions to noncontrolling interest owner		(11,349)				(11,349)
Distributions to unitholders		(297,013)		(221,677)	(75,336)
Acquisitions from affiliates		(356,250)	(372,784)	16,534
Contributions of equity-based compensation from Anadarko		2,521		2,471	50
Net pre-acquisition contributions from Anadarko	[2]	23,488	23,488
Net distributions to Anadarko of other assets		(6,398)		(6,271)	(127)
Elimination of net deferred tax liabilities		38,160	38,160
Other		628		628
Balance at Sep. 30, 2014		$ 2,683,713	$ 0	$ 2,524,313	$ 89,150	$ 70,250

[1] Financial information has been recast to include the financial position and results attributable to the TEFR Interests. See Note 1 and Note 2.

[2] Includes deferred taxes on capitalized interest of $0.3 million associated with the acquisition of the TEFR Interests as of September 30, 2014.

XML

Partnership Distributions - Additional Information (details)	9 Months Ended
	Sep. 30, 2014
Distributions Made to Members or Limited Partners [Abstract]
Partnership agreement day requirement of distribution of available cash	45 days

XML

Acquisitions (tables)

9 Months Ended

Sep. 30, 2014

Business Combinations [Abstract]

Acquisitions Table

The following table presents the acquisitions completed by the Partnership during 2014 and 2013, and identifies the funding sources for such acquisitions:

thousands except unit and percent amounts	Acquisition Date	Percentage Acquired		Borrowings		Cash On Hand		Common Units Issued
Non-Operated Marcellus Interest (1)	03/01/2013	33.75	%	$	250,000	$	215,500	449,129
Anadarko-Operated Marcellus Interest (2)	03/08/2013	33.75	%	133,500		—		—
Mont Belvieu JV (3)	06/05/2013	25	%	—		78,129		—
OTTCO (4)	09/03/2013	100	%	27,500		—		—
TEFR Interests (5)	03/03/2014	Various (5)		350,000		6,250		308,490

⁽¹⁾  The Partnership acquired Anadarko’s 33.75% interest (non-operated) in the Liberty and Rome gas gathering systems, serving production from the Marcellus shale in north-central Pennsylvania. The interest acquired is referred to as the “Non-Operated Marcellus Interest.” In connection with the issuance of the common units, the Partnership’s general partner purchased 9,166 general partner units for consideration of $0.5 million to maintain its 2.0% general partner interest in the Partnership.

⁽²⁾  The Partnership acquired a 33.75% interest in each of the Larry’s Creek, Seely and Warrensville gas gathering systems, which are operated by Anadarko and serve production from the Marcellus shale in north-central Pennsylvania, from a third party. The interest acquired is referred to as the “Anadarko-Operated Marcellus Interest.” During the third quarter of 2013, the Partnership recorded a $1.1 million decrease in the assets acquired and liabilities assumed in the acquisition, representing the final purchase price allocation.

⁽³⁾  The Partnership acquired a 25% interest in the Mont Belvieu JV, an entity formed to design, construct, and own two fractionation trains located in Mont Belvieu, Texas, from a third party. The interest acquired is accounted for under the equity method of accounting.

⁽⁴⁾  The Partnership acquired Overland Trail Transmission, LLC (“OTTCO”), a Delaware limited liability company, from a third party. OTTCO owns and operates an intrastate pipeline that connects the Partnership’s Red Desert and Granger complexes in southwestern Wyoming.

⁽⁵⁾  The Partnership acquired a 20% interest in each of TEG and TEP and a 33.33% interest in FRP from Anadarko. These assets gather and transport NGLs primarily from the Anadarko and Denver-Julesburg Basins. The interests in these entities are accounted for under the equity method of accounting. In connection with the issuance of the common units, the Partnership’s general partner purchased 6,296 general partner units for consideration of $0.4 million to maintain its 2.0% general partner interest in the Partnership.

Impact to Historical Consolidated Statement of Income Table

The following table presents the impact of the TEFR Interests on revenues, equity income (loss), net and net income (loss) as presented in the Partnership’s historical consolidated statements of income:

	Three Months Ended September 30, 2013
thousands	Partnership Historical		TEFR Interests		Combined
Revenues	$	273,502	$	—	$	273,502
Equity income (loss), net	4,499		21		4,520
Net income (loss)	81,776		106		81,882

	Nine Months Ended September 30, 2013
thousands	Partnership Historical		TEFR Interests			Combined
Revenues	$	750,670	$	—		$	750,670
Equity income (loss), net	12,204		(260		)	11,944
Net income (loss)	196,724		(21		)	196,703

XML

Equity and Partners' Capital - Equity Offerings Table (details) (USD $)	1 Months Ended				9 Months Ended	0 Months Ended	1 Months Ended				0 Months Ended	1 Months Ended					9 Months Ended		12 Months Ended			9 Months Ended		12 Months Ended		9 Months Ended		12 Months Ended
	Dec. 31, 2013		May 31, 2013		Sep. 30, 2014	Jan. 03, 2014 Option On Securities [Member]	Dec. 31, 2013 Common Units [Member]		May 31, 2013 Common Units [Member]		Jan. 03, 2014 Common Units [Member] Option On Securities [Member]	May 31, 2013 Common Units [Member] Option On Securities [Member]	Dec. 31, 2013 General Partner [Member]		May 31, 2013 General Partner [Member]		Sep. 30, 2014 Continuous Offering Program [Member]		Dec. 31, 2013 Continuous Offering Program [Member]		Aug. 31, 2012 Continuous Offering Program [Member]	Sep. 30, 2014 Continuous Offering Program [Member] Common Units [Member]		Dec. 31, 2013 Continuous Offering Program [Member] Common Units [Member]		Sep. 30, 2014 Continuous Offering Program [Member] General Partner [Member]		Dec. 31, 2013 Continuous Offering Program [Member] General Partner [Member]
Capital Unit [Line Items]
Common units issued							4,800,000	[1]	7,015,000	[2]	300,000	915,000										1,133,384	[3]	685,735	[4]
General partner units issued													97,959	[1],[5]	143,163	[2],[5]	1,156,516									23,132	[3],[5]	13,996	[4],[5]
Price per unit	$ 61.51	[1]	$ 61.18	[2]
Average price per unit																	$ 73.48	[3]	$ 60.84	[4]
Underwriting discount and other offering expenses	$ 9,447,000	[1]	$ 13,203,000	[2]													$ 1,726,000	[3]	$ 965,000	[4]
Net proceeds	291,827,000	[1]	424,733,000	[2]		18,100,000											83,257,000	[3]	41,603,000	[4]
Table Text Block Supplement [Abstract]
General partner's interest					2.00%
Maximum aggregate principal of common stock																					125,000,000
Gross proceeds																	$ 85,000,000		$ 42,600,000

[1] Includes the issuance of 300,000 common units on January 3, 2014, pursuant to the partial exercise of the underwriters’ over-allotment option granted in connection with the December 2013 equity offering. Net proceeds from this partial exercise (including the general partner’s proportionate capital contribution) were $18.1 million.

[2] Includes the issuance of 915,000 common units pursuant to the full exercise of the underwriters’ over-allotment option granted in connection with the May 2013 equity offering.

[3] Represents common and general partner units issued during the nine months ended September 30, 2014, under the Continuous Offering Program. Gross proceeds generated (including the general partner’s proportionate capital contributions) were $85.0 million. The price per unit in the table above represents an average price for all issuances under the Continuous Offering Program during the nine months ended September 30, 2014. As of September 30, 2014, the Partnership had used all the capacity to issue common units under this registration statement.

[4] Represents common and general partner units issued during the year ended December 31, 2013, pursuant to the Partnership’s registration statement filed with the SEC in August 2012 authorizing the issuance of up to an aggregate of $125.0 million of common units (the “Continuous Offering Program”). Gross proceeds generated (including the general partner’s proportionate capital contributions) during the year ended December 31, 2013, were $42.6 million. The price per unit in the table above represents an average price for all issuances under the Continuous Offering Program during 2013.

[5] Represents general partner units issued to the general partner in exchange for the general partner’s proportionate capital contribution to maintain its 2.0% general partner interest in the Partnership.

XML

Equity and Partners' Capital (tables)

9 Months Ended

Sep. 30, 2014

Partners' Capital Notes [Abstract]

Equity Offerings Table

The Partnership completed the following public offerings of its common units during 2014 and 2013:

thousands except unit    and per-unit amounts	Common Units Issued	GP Units Issued(1)	Price Per Unit		Underwriting Discount and Other Offering Expenses		Net Proceeds
May 2013 equity offering (2)	7,015,000	143,163	$	61.18	$	13,203	$	424,733
December 2013 equity offering (3)	4,800,000	97,959	61.51		9,447		291,827
Continuous Offering Program - 2013 (4)	685,735	13,996	60.84		965		41,603
Continuous Offering Program - 2014 (5)	1,133,384	23,132	73.48		1,726		83,257

⁽¹⁾  Represents general partner units issued to the general partner in exchange for the general partner’s proportionate capital contribution to maintain its 2.0% general partner interest in the Partnership.

⁽²⁾  Includes the issuance of 915,000 common units pursuant to the full exercise of the underwriters’ over-allotment option granted in connection with the May 2013 equity offering.

⁽³⁾  Includes the issuance of 300,000 common units on January 3, 2014, pursuant to the partial exercise of the underwriters’ over-allotment option granted in connection with the December 2013 equity offering. Net proceeds from this partial exercise (including the general partner’s proportionate capital contribution) were $18.1 million.

⁽⁴⁾  Represents common and general partner units issued during the year ended December 31, 2013, pursuant to the Partnership’s registration statement filed with the SEC in August 2012 authorizing the issuance of up to an aggregate of $125.0 million of common units (the “Continuous Offering Program”). Gross proceeds generated (including the general partner’s proportionate capital contributions) during the year ended December 31, 2013, were $42.6 million. The price per unit in the table above represents an average price for all issuances under the Continuous Offering Program during 2013.

⁽⁵⁾  Represents common and general partner units issued during the nine months ended September 30, 2014, under the Continuous Offering Program. Gross proceeds generated (including the general partner’s proportionate capital contributions) were $85.0 million. The price per unit in the table above represents an average price for all issuances under the Continuous Offering Program during the nine months ended September 30, 2014. As of September 30, 2014, the Partnership had used all the capacity to issue common units under this registration statement.

Limited Partner and General Partner Units Table

The following table summarizes common and general partner units issued during the nine months ended September 30, 2014:

	Common Units	General Partner Units	Total
Balance at December 31, 2013	117,322,812	2,394,345	119,717,157
December 2013 equity offering	300,000	6,122	306,122
Long-Term Incentive Plan awards	5,418	112	5,530
TEFR Interests acquisition	308,490	6,296	314,786
Continuous Offering Program	1,133,384	23,132	1,156,516
Balance at September 30, 2014	119,070,104	2,430,007	121,500,111

XML

Consolidated Statement of Equity and Partners Capital (Parenthetical) (USD $) In Thousands, unless otherwise specified	9 Months Ended
	Sep. 30, 2014
Deferred taxes on capitalized interest	$ (38,160)
Net Investment by Anadarko [Member]
Deferred taxes on capitalized interest	(38,160)
Capitalized Interest [Member] | Net Investment by Anadarko [Member]
Deferred taxes on capitalized interest	$ 300

XML

Consolidated Statements of Income (Parenthetical) (USD $) In Thousands, unless otherwise specified	3 Months Ended				9 Months Ended
	Sep. 30, 2014		Sep. 30, 2013		Sep. 30, 2014		Sep. 30, 2013
Cost of product	$ 108,393	[1]	$ 93,516	[1],[2]	$ 318,428	[1]	$ 270,059	[1],[2]
Operation and maintenance	53,657	[1]	42,757	[1],[2]	145,064	[1]	121,165	[1],[2]
General and administrative	7,889	[1]	7,276	[1],[2]	24,304	[1]	22,228	[1],[2]
Affiliated Entity [Member]
Cost of product	22,728	[3]	33,753	[3]	74,592	[3]	97,801	[3]
Operation and maintenance	14,556	[4]	13,469	[4]	42,472	[4]	41,021	[4]
General and administrative	$ 6,566	[5]	$ 5,867	[5]	$ 19,859	[5]	$ 17,325	[5]

[1] Cost of product includes product purchases from Anadarko (as defined in Note 1) of $22.7 million and $74.6 million for the three and nine months ended September 30, 2014, respectively, and $33.8 million and $97.8 million for the three and nine months ended September 30, 2013, respectively. Operation and maintenance includes charges from Anadarko of $14.6 million and $42.5 million for the three and nine months ended September 30, 2014, respectively, and $13.5 million and $41.0 million for the three and nine months ended September 30, 2013, respectively. General and administrative includes charges from Anadarko of $6.6 million and $19.9 million for the three and nine months ended September 30, 2014, respectively, and $5.9 million and $17.3 million for the three and nine months ended September 30, 2013, respectively. See Note 5.

[2] Financial information has been recast to include the financial position and results attributable to the TEFR Interests. See Note 1 and Note 2.

[3] Represents amounts earned or incurred on and subsequent to the date of acquisition of the Partnership assets, as well as amounts earned or incurred by Anadarko on a historical basis related to the Partnership assets prior to the acquisition of such assets, recognized under gathering, treating or processing agreements, and purchase and sale agreements.

[4] Represents expenses incurred on and subsequent to the date of the acquisition of the Partnership assets, as well as expenses incurred by Anadarko on a historical basis related to the Partnership assets prior to the acquisition of such assets.

[5] Represents general and administrative expense incurred on and subsequent to the date of the Partnership’s acquisition of the Partnership assets, as well as a management services fee for reimbursement of expenses incurred by Anadarko for periods prior to the acquisition of the Partnership assets by the Partnership. These amounts include equity-based compensation expense allocated to the Partnership by Anadarko (see WES LTIP and WGP LTIP and Anadarko Incentive Plans within this Note 5).

XML

Debt and Interest Expense

9 Months Ended

Sep. 30, 2014

Debt Instruments [Abstract]

Debt and Interest Expense

8.  DEBT AND INTEREST EXPENSE

At September 30, 2014, the Partnership’s debt consisted of 5.375% Senior Notes due 2021 (the “2021 Notes”), 4.000% Senior Notes due 2022 (the “2022 Notes”), 2.600% Senior Notes due 2018 (the “2018 Notes”), 5.450% Senior Notes due 2044 (the “2044 Notes”), and the senior unsecured revolving credit facility (“RCF”). The two tranches of the 2022 Notes, issued in June and October 2012, were issued under the same indenture and are considered a single class of securities. The two tranches of the 2018 Notes, issued in August 2013 and March 2014, were issued under the same indenture and are considered a single class of securities.

The following table presents the Partnership’s outstanding debt as of September 30, 2014, and December 31, 2013:

	September 30, 2014						December 31, 2013
thousands	Principal		Carrying Value		Fair Value(1)		Principal		Carrying Value		Fair Value (1)
5.375% Senior Notes due 2021	$	500,000	$	495,576	$	557,828	$	500,000	$	495,173	$	533,615
4.000% Senior Notes due 2022	670,000		673,017		690,811		670,000		673,278		641,237
Revolving credit facility	170,000		170,000		170,000		—		—		—
2.600% Senior Notes due 2018	350,000		350,506		355,311		250,000		249,718		247,988
5.450% Senior Notes due 2044	400,000		393,815		437,573		—		—		—
Total debt outstanding	$	2,090,000	$	2,082,914	$	2,211,523	$	1,420,000	$	1,418,169	$	1,422,840

⁽¹⁾  Fair value is measured using Level 2 inputs.

Debt activity. The following table presents the debt activity of the Partnership for the nine months ended September 30, 2014:

thousands	Carrying Value
Balance at December 31, 2013	$	1,418,169
Revolving credit facility borrowings	650,000
Issuance of 5.450% Senior Notes due 2044	400,000
Issuance of 2.600% Senior Notes due 2018	100,000
Repayments of revolving credit facility	(480,000		)
Other	(5,255		)
Balance at September 30, 2014	$	2,082,914

8.  DEBT AND INTEREST EXPENSE (CONTINUED)

Senior Notes. The 2044 Notes issued in March 2014 were offered at a price to the public of 98.443% of the face amount. Including the effects of the issuance and underwriting discounts, the effective interest rate of the 2044 Notes is 5.633%. Interest is paid semi-annually on April 1 and October 1 of each year. Proceeds (net of underwriting discount of $3.5 million, original issue discount and debt issuance costs) were used to repay amounts then outstanding under the Partnership’s RCF and for general partnership purposes.

The 2018 Notes issued in March 2014 were offered at a price to the public of 100.857% of the face amount. Including the effects of the issuance premium for the March 2014 offering, the issuance discount for the August 2013 offering of 2018 Notes and underwriting discounts, the effective interest rate of the 2018 Notes is 2.743%. Interest is paid semi-annually on February 15 and August 15 of each year. Proceeds (net of underwriting discount of $0.6 million, original issue premium and debt issuance costs) were used to repay amounts then outstanding under the Partnership’s RCF and for general partnership purposes.

At September 30, 2014, the Partnership was in compliance with all covenants under the indentures governing the 2021 Notes, 2022 Notes, 2018 Notes, and 2044 Notes.

Revolving credit facility. In February 2014, the Partnership entered into an amended and restated $1.2 billion senior unsecured RCF, which is expandable to a maximum of $1.5 billion, replacing an $800.0 million credit facility, which was originally entered into in March 2011. Subsequent to February 2014, the Partnership borrowed $350.0 million under the RCF to fund the acquisition of the TEFR Interests (see Note 2). The RCF matures in February 2019 and bears interest at London Interbank Offered Rate (“LIBOR”), plus applicable margins ranging from 0.975% to 1.45%, or an alternate base rate equal to the greatest of (a) the Prime Rate, (b) the Federal Funds Effective Rate plus 0.5%, or (c) LIBOR plus 1%, in each case plus applicable margins currently ranging from zero to 0.45%, based upon the Partnership’s senior unsecured debt rating. The interest rate on the RCF was 1.46% at September 30, 2014. At December 31, 2013, the interest rate on the previous credit facility was 1.67%. The Partnership is required to pay a quarterly facility fee currently ranging from 0.15% to 0.30% of the commitment amount (whether used or unused), based upon the Partnership’s senior unsecured debt rating. The facility fee rate was 0.20% and 0.25% at September 30, 2014, and December 31, 2013, respectively.

As of September 30, 2014, the Partnership had $170.0 million of outstanding borrowings, $12.8 million in outstanding letters of credit and $1.0 billion available for borrowing under the RCF. At September 30, 2014, the Partnership was in compliance with all covenants under the RCF. See Note 10.

The 2021 Notes, 2022 Notes, 2018 Notes, 2044 Notes and obligations under the RCF are recourse to the Partnership’s general partner. The Partnership’s general partner is indemnified by a wholly owned subsidiary of Anadarko, Western Gas Resources, Inc. (“WGRI”), against any claims made against the general partner under the 2022 Notes, 2021 Notes, and/or the RCF.

In connection with the acquisitions of the Non-Operated Marcellus Interest, the Anadarko-Operated Marcellus Interest, and the TEFR Interests, the Partnership’s general partner and other wholly owned subsidiaries of Anadarko entered into indemnification agreements, whereby such subsidiaries agreed to indemnify the Partnership’s general partner for any recourse liability it may have for RCF borrowings, or other debt financing, attributable to the acquisitions of the Non-Operated Marcellus Interest, the Anadarko-Operated Marcellus Interest, and the TEFR Interests. These indemnification agreements apply to the 2044 Notes, 2018 Notes, and/or RCF borrowings outstanding related to the aforementioned acquisitions.

The Partnership’s general partner, the other indemnifying subsidiaries of Anadarko and WGRI also amended and restated the indemnity agreements between them to (i) conform language among all the indemnification agreements and (ii) reduce the amount for which WGRI would indemnify the Partnership’s general partner by an amount equal to any amounts payable to the Partnership’s general partner under the indemnification agreements related to the acquisitions of the Non-Operated Marcellus Interest, the Anadarko-Operated Marcellus Interest, and the TEFR Interests.

8.  DEBT AND INTEREST EXPENSE (CONTINUED)

Interest expense. The following table summarizes the amounts included in interest expense:

	Three Months Ended   September 30,						Nine Months Ended   September 30,
thousands	2014			2013			2014			2013
Interest expense on long-term debt	$	21,671		$	14,994		$	59,251		$	43,783
Amortization of debt issuance costs and commitment fees	1,107			1,135			3,799			3,252
Capitalized interest	(1,900		)	(3,111		)	(7,347		)	(9,552		)
Interest expense	$	20,878		$	13,018		$	55,703		$	37,483

XML

Document and Entity Information	9 Months Ended
	Sep. 30, 2014	Oct. 27, 2014
Document And Entity Information [Abstract]
Entity Registrant Name	WESTERN GAS PARTNERS LP
Entity Central Index Key	0001414475
Document Type	10-Q
Document Period End Date	Sep. 30, 2014
Amendment Flag	false
Document Fiscal Year Focus	2014
Document Fiscal Period Focus	Q3
Current Fiscal Year End Date	--12-31
Entity Filer Category	Large Accelerated Filer
Entity Common Units Outstanding		119,070,104

XML

Commitments and Contingencies

9 Months Ended

Sep. 30, 2014

Commitments and Contingencies Disclosure [Abstract]

Commitments and Contingencies

9.  COMMITMENTS AND CONTINGENCIES

Litigation and legal proceedings. In March 2011, DCP Midstream, LP (“DCP”) filed a lawsuit against Anadarko and others, including a Partnership subsidiary, Kerr-McGee Gathering, LLC, in Weld County District Court (the “Court”) in Colorado, alleging that Anadarko diverted gas from DCP’s gathering and processing facilities in breach of certain dedication agreements. In addition to various claims against Anadarko, DCP is claiming unjust enrichment and other damages against Kerr-McGee Gathering, LLC, the entity that holds the Wattenberg assets (located in the DJ Basin complex). Anadarko countersued DCP asserting that DCP has not properly allocated values and charges to Anadarko for the gas that DCP gathers and/or processes, and seeks a judgment that DCP has no valid gathering or processing rights to much of the gas production it is claiming, in addition to other claims.

In July 2011, the Court denied the defendants’ motion to dismiss without ruling on the merits. In August 2014, the judge scheduled a jury trial for July 2015. In preparation for trial, the parties amended their pleadings in October 2014 and are engaged in discovery and motion practice. Management does not believe the outcome of this proceeding will have a material effect on the Partnership’s financial condition, results of operations or cash flows. The Partnership intends to vigorously defend this litigation. Furthermore, without regard to the merit of DCP’s claims, management believes that the Partnership has adequate contractual indemnities covering the claims against it in this lawsuit.

In addition, from time to time, the Partnership is involved in legal, tax, regulatory and other proceedings in various forums regarding performance, contracts and other matters that arise in the ordinary course of business. Management is not aware of any such proceeding for which a final disposition could have a material adverse effect on the Partnership’s financial condition, results of operations or cash flows.

Other commitments. The Partnership has short-term payment obligations, or commitments, related to its capital spending programs, as well as those of its unconsolidated affiliates. As of September 30, 2014, the Partnership had unconditional payment obligations for services to be rendered or products to be delivered in connection with its capital projects of $70.5 million, the majority of which is expected to be paid in the next twelve months. These commitments relate primarily to projects at the DJ Basin complex, which include the continued construction of a second train and compressor expansions.

Lease commitments. Anadarko, on behalf of the Partnership, has entered into lease agreements for corporate offices, shared field offices and a warehouse supporting the Partnership’s operations. The leases for the corporate offices and shared field offices extend through 2017 and 2018, respectively, and the lease for the warehouse extends through February 2015 and includes an early termination clause.

Rent expense associated with the office, warehouse and equipment leases was $0.7 million and $2.2 million for the three and nine months ended September 30, 2014, respectively, and $0.6 million and $2.0 million for the three and nine months ended September 30, 2013, respectively.

XML

Consolidated Balance Sheets (USD $) In Thousands, unless otherwise specified	Sep. 30, 2014		Dec. 31, 2013
Current assets
Cash and cash equivalents	$ 67,837		$ 100,728	[1]
Accounts receivable, net	126,345	[2]	84,060	[1],[2]
Other current assets	6,773	[3]	10,022	[1],[3]
Total current assets	200,955		194,810	[1]
Note receivable - Anadarko	260,000		260,000	[1]
Property, plant and equipment
Cost	4,754,279		4,239,100	[1]
Less accumulated depreciation	986,692		855,845	[1]
Net property, plant and equipment	3,767,587		3,383,255	[1]
Goodwill	105,336		105,336	[1]
Other intangible assets	52,561		53,606	[1]
Equity investments	639,191		593,400	[1]
Other assets	28,910		27,401	[1]
Total assets	5,054,540		4,617,808	[1]
Current liabilities
Accounts and natural gas imbalance payables	27,011	[4]	39,589	[1],[4]
Accrued ad valorem taxes	21,083		13,860	[1]
Income taxes payable	258		0	[1]
Accrued liabilities	152,878	[5]	137,011	[1],[5]
Total current liabilities	201,230		190,460	[1]
Long-term debt	2,082,914		1,418,169	[1]
Deferred income taxes	780		37,998	[1]
Asset retirement obligations and other	85,903		79,145	[1]
Total long-term liabilities	2,169,597		1,535,312	[1]
Total liabilities	2,370,827		1,725,772	[1]
Equity and partners' capital
Common units (119,070,104 and 117,322,812 units issued and outstanding at September 30, 2014, and December 31, 2013, respectively)	2,524,313		2,431,193	[1]
General partner units (2,430,007 and 2,394,345 units issued and outstanding at September 30, 2014, and December 31, 2013, respectively)	89,150		78,157	[1]
Net investment by Anadarko	0		312,092	[1]
Total partners' capital	2,613,463		2,821,442	[1]
Noncontrolling interest	70,250		70,594	[1]
Total equity and partners' capital	2,683,713		2,892,036	[1]
Total liabilities, equity and partners' capital	$ 5,054,540		$ 4,617,808	[1]

[1] Financial information has been recast to include the financial position and results attributable to the TEFR Interests. See Note 1 and Note 2.

[2] Accounts receivable, net includes amounts receivable from affiliates (as defined in Note 1) of $87.3 million and $47.9 million as of September 30, 2014, and December 31, 2013, respectively.

[3] Other current assets includes natural gas imbalance receivables from affiliates of $0.1 million as of September 30, 2014, and December 31, 2013.

[4] Accounts and natural gas imbalance payables includes amounts payable to affiliates of $0.1 million and $2.3 million as of September 30, 2014, and December 31, 2013, respectively.

[5] Accrued liabilities includes amounts payable to affiliates of zero and $0.1 million as of September 30, 2014, and December 31, 2013, respectively.

XML

Partnership Distributions

9 Months Ended

Sep. 30, 2014

Distributions Made to Members or Limited Partners [Abstract]

Partnership Distributions

3.  PARTNERSHIP DISTRIBUTIONS

The partnership agreement of Western Gas Partners, LP requires the Partnership to distribute all of its available cash (as defined in the partnership agreement) to unitholders of record on the applicable record date within 45 days of the end of each quarter. The board of directors of the general partner declared the following cash distributions to the Partnership’s unitholders for the periods presented:

thousands except per-unit amounts Quarters Ended	Total Quarterly Distribution per Unit		Total Quarterly Cash Distribution		Date of Distribution
2013
March 31	$	0.540	$	70,143	May 2013
June 30	0.560		79,315		August 2013
September 30	0.580		83,986		November 2013
2014
March 31	$	0.625	$	98,749	May 2014
June 30	0.650		105,655		August 2014
September 30 (1)	0.675		111,609		November 2014

⁽¹⁾  On October 20, 2014, the board of directors of the Partnership’s general partner declared a cash distribution to the Partnership’s unitholders of $0.675 per unit, or $111.6 million in aggregate, including incentive distributions. The cash distribution is payable on November 13, 2014, to unitholders of record at the close of business on October 31, 2014.

XML

Acquisitions

9 Months Ended

Sep. 30, 2014

Business Combinations [Abstract]

Acquisitions

2.  ACQUISITIONS

The following table presents the acquisitions completed by the Partnership during 2014 and 2013, and identifies the funding sources for such acquisitions:

thousands except unit and percent amounts	Acquisition Date	Percentage Acquired		Borrowings		Cash On Hand		Common Units Issued
Non-Operated Marcellus Interest (1)	03/01/2013	33.75	%	$	250,000	$	215,500	449,129
Anadarko-Operated Marcellus Interest (2)	03/08/2013	33.75	%	133,500		—		—
Mont Belvieu JV (3)	06/05/2013	25	%	—		78,129		—
OTTCO (4)	09/03/2013	100	%	27,500		—		—
TEFR Interests (5)	03/03/2014	Various (5)		350,000		6,250		308,490

⁽¹⁾  The Partnership acquired Anadarko’s 33.75% interest (non-operated) in the Liberty and Rome gas gathering systems, serving production from the Marcellus shale in north-central Pennsylvania. The interest acquired is referred to as the “Non-Operated Marcellus Interest.” In connection with the issuance of the common units, the Partnership’s general partner purchased 9,166 general partner units for consideration of $0.5 million to maintain its 2.0% general partner interest in the Partnership.

⁽²⁾  The Partnership acquired a 33.75% interest in each of the Larry’s Creek, Seely and Warrensville gas gathering systems, which are operated by Anadarko and serve production from the Marcellus shale in north-central Pennsylvania, from a third party. The interest acquired is referred to as the “Anadarko-Operated Marcellus Interest.” During the third quarter of 2013, the Partnership recorded a $1.1 million decrease in the assets acquired and liabilities assumed in the acquisition, representing the final purchase price allocation.

⁽³⁾  The Partnership acquired a 25% interest in the Mont Belvieu JV, an entity formed to design, construct, and own two fractionation trains located in Mont Belvieu, Texas, from a third party. The interest acquired is accounted for under the equity method of accounting.

⁽⁴⁾  The Partnership acquired Overland Trail Transmission, LLC (“OTTCO”), a Delaware limited liability company, from a third party. OTTCO owns and operates an intrastate pipeline that connects the Partnership’s Red Desert and Granger complexes in southwestern Wyoming.

⁽⁵⁾  The Partnership acquired a 20% interest in each of TEG and TEP and a 33.33% interest in FRP from Anadarko. These assets gather and transport NGLs primarily from the Anadarko and Denver-Julesburg Basins. The interests in these entities are accounted for under the equity method of accounting. In connection with the issuance of the common units, the Partnership’s general partner purchased 6,296 general partner units for consideration of $0.4 million to maintain its 2.0% general partner interest in the Partnership.

TEFR Interests acquisition. Because the acquisition of the TEFR Interests was a transfer of net assets between entities under common control, the Partnership’s historical financial statements previously filed with the SEC have been recast in this Form 10-Q to include the results attributable to the TEFR Interests for all periods presented. The consolidated financial statements for periods prior to the Partnership’s acquisition of the TEFR Interests have been prepared from Anadarko’s historical cost-basis accounts and may not necessarily be indicative of the actual results of operations that would have occurred if the Partnership had owned the TEFR Interests during the periods reported.

2.  ACQUISITIONS (CONTINUED)

The following table presents the impact of the TEFR Interests on revenues, equity income (loss), net and net income (loss) as presented in the Partnership’s historical consolidated statements of income:

	Three Months Ended September 30, 2013
thousands	Partnership Historical		TEFR Interests		Combined
Revenues	$	273,502	$	—	$	273,502
Equity income (loss), net	4,499		21		4,520
Net income (loss)	81,776		106		81,882

	Nine Months Ended September 30, 2013
thousands	Partnership Historical		TEFR Interests			Combined
Revenues	$	750,670	$	—		$	750,670
Equity income (loss), net	12,204		(260		)	11,944
Net income (loss)	196,724		(21		)	196,703

XML

Partnership Distributions (tables)

9 Months Ended

Sep. 30, 2014

Distributions Made to Members or Limited Partners [Abstract]

Cash Distributions Table

The board of directors of the general partner declared the following cash distributions to the Partnership’s unitholders for the periods presented:

thousands except per-unit amounts Quarters Ended	Total Quarterly Distribution per Unit		Total Quarterly Cash Distribution		Date of Distribution
2013
March 31	$	0.540	$	70,143	May 2013
June 30	0.560		79,315		August 2013
September 30	0.580		83,986		November 2013
2014
March 31	$	0.625	$	98,749	May 2014
June 30	0.650		105,655		August 2014
September 30 (1)	0.675		111,609		November 2014

⁽¹⁾  On October 20, 2014, the board of directors of the Partnership’s general partner declared a cash distribution to the Partnership’s unitholders of $0.675 per unit, or $111.6 million in aggregate, including incentive distributions. The cash distribution is payable on November 13, 2014, to unitholders of record at the close of business on October 31, 2014.

XML

Subsequent Event

9 Months Ended

Sep. 30, 2014

Subsequent Events [Abstract]

Subsequent Event

10.  SUBSEQUENT EVENT

On October 28, 2014, the Partnership announced its entry into an Agreement and Plan of Merger by and among the Partnership, Maguire Midstream, LLC, Nuevo Midstream, LLC (“Nuevo”) and the other parties thereto, pursuant to which the Partnership will acquire Nuevo for $1.5 billion in cash, subject to adjustment. Nuevo’s assets currently include a cryogenic processing complex, gas gathering system and related facilities and equipment. The assets serve production from Reeves, Loving and Culberson Counties, Texas and Eddy and Lea Counties, New Mexico.

The Partnership expects to fund this acquisition with (i) cash on hand, (ii) borrowings under the RCF and (iii) the issuance of $750.0 million of Class C units to Anadarko. The Class C units will receive distributions in the form of additional Class C units until the end of 2017 (unless earlier converted), and will be disregarded with respect to calculating the Partnership’s cash distributions until they are converted to common units. The Class C units will convert into common units on a one-for-one basis on December 31, 2017, unless the Partnership elects to convert such units earlier or Anadarko extends the conversion date.

Pursuant to the terms of a joint venture agreement between Anadarko and a third party, the Partnership has offered the third party the right to acquire a 50% interest in Nuevo. The third party is required to respond to the Partnership’s offer within thirty days of receiving notice, and will have an additional thirty days to fund its share of the purchase price if it accepts the offer. The Partnership is prepared to purchase 100% of Nuevo if the third party does not participate. The Partnership expects the acquisition will close in the fourth quarter of 2014 subject to regulatory approval and customary closing conditions.

XML

Property, Plant and Equipment

9 Months Ended

Sep. 30, 2014

Property, Plant and Equipment [Abstract]

Property, Plant and Equipment

6.  PROPERTY, PLANT AND EQUIPMENT

A summary of the historical cost of the Partnership’s property, plant and equipment is as follows:

thousands	Estimated Useful Life	September 30, 2014		December 31, 2013
Land	n/a	$	2,584	$	2,584
Gathering systems	3 to 47 years	4,244,640		3,673,008
Pipelines and equipment	15 to 45 years	145,851		146,008
Assets under construction	n/a	345,799		405,633
Other	3 to 40 years	15,405		11,867
Total property, plant and equipment		4,754,279		4,239,100
Accumulated depreciation		986,692		855,845
Net property, plant and equipment		$	3,767,587	$	3,383,255

The cost of property classified as “Assets under construction” is excluded from capitalized costs being depreciated. These amounts represent property that is not yet suitable to be placed into productive service as of the respective balance sheet date.

At December 31, 2013, other long-term assets includes $4.6 million of unguaranteed residual value related to the capital lease component of a processing agreement assumed in connection with the acquisition of the Granger straddle plant as a part of the Mountain Gas Resources, LLC acquisition in January 2012. This agreement, in which the Partnership was the lessor, was replaced effective April 1, 2014, with a gas conditioning agreement that does not satisfy criteria required for lease classification. As such, during the second quarter of 2014, the Partnership reclassified the $4.6 million capital lease asset from other long-term assets to property, plant and equipment and commenced depreciation.

During the three and nine months ended September 30, 2014, the Partnership recognized impairments of $0.4 million and $0.7 million, respectively, related to the cancellation of various capital projects by the third-party operator of the Non-Operated Marcellus Interest. During the three months ended September 30, 2014, the Partnership also recognized an impairment of $0.5 million related to a compressor no longer in service at the Hilight system. During the first quarter of 2014, the Partnership recognized a $1.2 million impairment primarily related to a non-operational plant in the Powder River Basin that was impaired to its estimated fair value of $2.4 million, using Level 3 fair-value inputs.

XML

Equity and Partners' Capital

9 Months Ended

Sep. 30, 2014

Partners' Capital Notes [Abstract]

Equity and Partners' Capital

4.  EQUITY AND PARTNERS’ CAPITAL

Equity offerings. The Partnership completed the following public offerings of its common units during 2014 and 2013:

thousands except unit    and per-unit amounts	Common Units Issued	GP Units Issued(1)	Price Per Unit		Underwriting Discount and Other Offering Expenses		Net Proceeds
May 2013 equity offering (2)	7,015,000	143,163	$	61.18	$	13,203	$	424,733
December 2013 equity offering (3)	4,800,000	97,959	61.51		9,447		291,827
Continuous Offering Program - 2013 (4)	685,735	13,996	60.84		965		41,603
Continuous Offering Program - 2014 (5)	1,133,384	23,132	73.48		1,726		83,257

⁽¹⁾  Represents general partner units issued to the general partner in exchange for the general partner’s proportionate capital contribution to maintain its 2.0% general partner interest in the Partnership.

⁽²⁾  Includes the issuance of 915,000 common units pursuant to the full exercise of the underwriters’ over-allotment option granted in connection with the May 2013 equity offering.

⁽³⁾  Includes the issuance of 300,000 common units on January 3, 2014, pursuant to the partial exercise of the underwriters’ over-allotment option granted in connection with the December 2013 equity offering. Net proceeds from this partial exercise (including the general partner’s proportionate capital contribution) were $18.1 million.

⁽⁴⁾  Represents common and general partner units issued during the year ended December 31, 2013, pursuant to the Partnership’s registration statement filed with the SEC in August 2012 authorizing the issuance of up to an aggregate of $125.0 million of common units (the “Continuous Offering Program”). Gross proceeds generated (including the general partner’s proportionate capital contributions) during the year ended December 31, 2013, were $42.6 million. The price per unit in the table above represents an average price for all issuances under the Continuous Offering Program during 2013.

⁽⁵⁾  Represents common and general partner units issued during the nine months ended September 30, 2014, under the Continuous Offering Program. Gross proceeds generated (including the general partner’s proportionate capital contributions) were $85.0 million. The price per unit in the table above represents an average price for all issuances under the Continuous Offering Program during the nine months ended September 30, 2014. As of September 30, 2014, the Partnership had used all the capacity to issue common units under this registration statement.

Common and general partner units. The Partnership’s common units are listed on the New York Stock Exchange under the symbol “WES.”

The following table summarizes common and general partner units issued during the nine months ended September 30, 2014:

	Common Units	General Partner Units	Total
Balance at December 31, 2013	117,322,812	2,394,345	119,717,157
December 2013 equity offering	300,000	6,122	306,122
Long-Term Incentive Plan awards	5,418	112	5,530
TEFR Interests acquisition	308,490	6,296	314,786
Continuous Offering Program	1,133,384	23,132	1,156,516
Balance at September 30, 2014	119,070,104	2,430,007	121,500,111

Holdings of Partnership equity. As of September 30, 2014, WGP held 49,296,205 common units, representing a 40.6% limited partner interest in the Partnership, and, through its ownership of the general partner, WGP indirectly held 2,430,007 general partner units, representing a 2.0% general partner interest in the Partnership, and 100% of the Partnership’s IDRs. As of September 30, 2014, other subsidiaries of Anadarko held 757,619 common units, representing a 0.6% limited partner interest in the Partnership. As of September 30, 2014, the public held 69,016,280 common units, representing a 56.8% limited partner interest in the Partnership.

4.  EQUITY AND PARTNERS’ CAPITAL (CONTINUED)

The Partnership’s net income earned on and subsequent to the date of the acquisition of the Partnership assets (as defined in Note 1) is allocated to the general partner and the limited partners consistent with actual cash distributions, including incentive distributions allocable to the general partner. Undistributed earnings (net income in excess of distributions) or undistributed losses (available cash in excess of net income) are then allocated to the general partner and the limited partners in accordance with their respective ownership percentages.

Basic and diluted net income per common unit are calculated by dividing the limited partners’ interest in net income by the weighted average number of common units outstanding during the period. The common units issued in connection with acquisitions and equity offerings are included on a weighted-average basis for periods during which they were outstanding.

XML

Transactions With Affiliates

9 Months Ended

Sep. 30, 2014

Related Party Fees and Other Arrangements, Limited Liability Company (LLC) or Limited Partnership (LP) [Abstract]

Transactions with Affiliates

5.  TRANSACTIONS WITH AFFILIATES

Affiliate transactions. Revenues from affiliates include amounts earned by the Partnership from services provided to Anadarko as well as from the sale of residue, condensate and NGLs to Anadarko. In addition, the Partnership purchases natural gas from an affiliate of Anadarko pursuant to gas purchase agreements. Operating and maintenance expense includes amounts accrued for or paid to affiliates for the operation of the Partnership assets, whether in providing services to affiliates or to third parties, including field labor, measurement and analysis, and other disbursements. A portion of the Partnership’s general and administrative expenses is paid by Anadarko, which results in affiliate transactions pursuant to the reimbursement provisions of the Partnership’s omnibus agreement. Affiliate expenses do not bear a direct relationship to affiliate revenues, and third-party expenses do not bear a direct relationship to third-party revenues. See Note 1 for further information related to contributions of assets to the Partnership by Anadarko.

Cash management. Anadarko operates a cash management system whereby excess cash from most of its subsidiaries’ separate bank accounts is generally swept to centralized accounts. Prior to the Partnership’s acquisition of the Partnership assets, third-party sales and purchases related to such assets were received or paid in cash by Anadarko within its centralized cash management system. Anadarko charged or credited the Partnership interest at a variable rate on outstanding affiliate balances for the periods these balances remained outstanding. The outstanding affiliate balances were entirely settled through an adjustment to net investment by Anadarko in connection with the acquisition of the Partnership assets. Subsequent to the acquisition of Partnership assets from Anadarko, transactions related to such assets are cash-settled directly with third parties and with Anadarko affiliates, and affiliate-based interest expense on current intercompany balances is not charged. Chipeta cash settles its transactions directly with third parties and Anadarko, as well as with the other subsidiaries of the Partnership.

Note receivable from Anadarko. Concurrently with the closing of the Partnership’s May 2008 initial public offering, the Partnership loaned $260.0 million to Anadarko in exchange for a 30-year note bearing interest at a fixed annual rate of 6.50%, payable quarterly. The fair value of the note receivable from Anadarko was $322.3 million and $296.7 million at September 30, 2014, and December 31, 2013, respectively. The fair value of the note reflects consideration of credit risk and any premium or discount for the differential between the stated interest rate and quarter-end market interest rate, based on quoted market prices of similar debt instruments. Accordingly, the fair value of the note receivable from Anadarko is measured using Level 2 inputs.

Commodity price swap agreements. The Partnership has commodity price swap agreements with Anadarko to mitigate exposure to commodity price volatility that would otherwise be present as a result of the purchase and sale of natural gas, condensate or NGLs. Notional volumes for each of the commodity price swap agreements are not specifically defined; instead, the commodity price swap agreements apply to the actual volume of natural gas, condensate and NGLs purchased and sold at the Granger, Hilight, Hugoton, Newcastle and MGR assets, as well as the DJ Basin complex, with various expiration dates through December 2016. In December 2013, the Partnership extended the commodity price swap agreements for the Hilight and Newcastle assets through December 2014. The commodity price swap agreements do not satisfy the definition of a derivative financial instrument and, therefore, are not required to be measured at fair value.

5.  TRANSACTIONS WITH AFFILIATES (CONTINUED)

Below is a summary of the fixed price ranges on the Partnership’s outstanding commodity price swap agreements as of September 30, 2014:

per barrel except natural gas	2014					2015					2016
Ethane	$	18.36	−	$	30.53	$	18.41	−	$	23.41	$	23.11
Propane	40.38		−	53.78		47.08		−	52.99		52.90
Isobutane	61.24		−	75.13		62.09		−	74.02		73.89
Normal butane	53.89		−	66.83		54.62		−	65.04		64.93
Natural gasoline	71.85		−	90.89		72.88		−	81.82		81.68
Condensate	75.22		−	87.30		76.47		−	81.82		81.68
Natural gas (per MMBtu)	3.45		−	6.20		4.66		−	5.96		4.87

The following table summarizes realized gains and losses on commodity price swap agreements:

	Three Months Ended   September 30,						Nine Months Ended   September 30,
thousands	2014			2013			2014			2013
Gains (losses) on commodity price swap agreements related to sales: (1)
Natural gas sales	$	3,179		$	6,923		$	1,525		$	14,707
Natural gas liquids sales	22,737			27,541			66,746			83,049
Total	25,916			34,464			68,271			97,756
Losses on commodity price swap agreements related to purchases (2)	(19,533		)	(23,902		)	(38,081		)	(66,613		)
Net gains (losses) on commodity price swap agreements	$	6,383		$	10,562		$	30,190		$	31,143

⁽¹⁾  Reported in affiliate natural gas, natural gas liquids and condensate sales in the consolidated statements of income in the period in which the related sale is recorded.

⁽²⁾  Reported in cost of product in the consolidated statements of income in the period in which the related purchase is recorded.

Gas gathering and processing agreements. The Partnership has significant gas gathering and processing arrangements with affiliates of Anadarko on a majority of its systems. The Partnership’s gathering, transportation and treating throughput (excluding equity investment throughput and throughput measured in barrels) attributable to natural gas production owned or controlled by Anadarko was 47% and 53% for the three months ended September 30, 2014 and 2013, respectively, and 48% and 55% for the nine months ended September 30, 2014 and 2013, respectively. The Partnership’s processing throughput (excluding equity investment throughput and throughput measured in barrels) attributable to natural gas production owned or controlled by Anadarko was 58% and 60% for the three months ended September 30, 2014 and 2013, respectively, and 58% and 59% for the nine months ended September 30, 2014 and 2013.

Equipment purchases and sales. The following table summarizes the Partnership’s purchases from and sales to Anadarko of pipe and equipment:

	Nine Months Ended September 30,
	2014		2013		2014		2013
thousands	Purchases				Sales
Cash consideration	$	16,143	$	6,167	$	—	$	82
Net carrying value	9,745		2,039		—		34
Partners’ capital adjustment	$	6,398	$	4,128	$	—	$	48

5.  TRANSACTIONS WITH AFFILIATES (CONTINUED)

WES LTIP. The general partner awards phantom units under the Western Gas Partners, LP 2008 Long-Term Incentive Plan (“WES LTIP”) primarily to its independent directors and its Chief Executive Officer. The phantom units awarded to the independent directors vest one year from the grant date, while all other awards are subject to graded vesting over a three-year service period. Compensation expense is recognized over the vesting period and was $0.2 million and $0.5 million for the three and nine months ended September 30, 2014, respectively, and $0.1 million and $0.4 million for the three and nine months ended September 30, 2013, respectively.

WGP LTIP and Anadarko Incentive Plans. The Partnership’s general and administrative expenses included $0.9 million and $2.7 million for the three and nine months ended September 30, 2014, respectively, and $0.8 million and $2.2 million for the three and nine months ended September 30, 2013, respectively, of equity-based compensation expense, allocated to the Partnership by Anadarko, for awards granted to the executive officers of the general partner and other employees under the Western Gas Equity Partners, LP 2012 Long-Term Incentive Plan (“WGP LTIP”) and Anadarko Incentive Plans. For the nine months ended September 30, 2014, $2.5 million of allocated equity-based compensation expense is reflected as a contribution to partners’ capital in the Partnership’s consolidated statement of equity and partners’ capital.

Summary of affiliate transactions. The following table summarizes affiliate transactions, which include revenue from affiliates, reimbursement of operating expenses and purchases of natural gas:

	Three Months Ended   September 30,				Nine Months Ended   September 30,
thousands	2014		2013		2014		2013
Revenues (1)	$	245,500	$	213,125	$	708,456	$	591,010
Equity income, net (1)	19,063		4,520		41,322		11,944
Cost of product (1)	22,728		33,753		74,592		97,801
Operation and maintenance (2)	14,556		13,469		42,472		41,021
General and administrative (3)	6,566		5,867		19,859		17,325
Operating expenses	43,850		53,089		136,923		156,147
Interest income, net (4)	4,225		4,225		12,675		12,675
Distributions to unitholders (5)	60,794		44,378		169,001		121,493

⁽¹⁾  Represents amounts earned or incurred on and subsequent to the date of acquisition of the Partnership assets, as well as amounts earned or incurred by Anadarko on a historical basis related to the Partnership assets prior to the acquisition of such assets, recognized under gathering, treating or processing agreements, and purchase and sale agreements.

⁽²⁾  Represents expenses incurred on and subsequent to the date of the acquisition of the Partnership assets, as well as expenses incurred by Anadarko on a historical basis related to the Partnership assets prior to the acquisition of such assets.

⁽³⁾  Represents general and administrative expense incurred on and subsequent to the date of the Partnership’s acquisition of the Partnership assets, as well as a management services fee for reimbursement of expenses incurred by Anadarko for periods prior to the acquisition of the Partnership assets by the Partnership. These amounts include equity-based compensation expense allocated to the Partnership by Anadarko (see WES LTIP and WGP LTIP and Anadarko Incentive Plans within this Note 5).

⁽⁴⁾  Represents interest income recognized on the note receivable from Anadarko.

⁽⁵⁾  Represents distributions paid under the partnership agreement (see Note 3 and Note 4).

Concentration of credit risk. Anadarko was the only customer from whom revenues exceeded 10% of the Partnership’s consolidated revenues for all periods presented in the consolidated statements of income.

XML

Components of Working Capital

9 Months Ended

Sep. 30, 2014

Components Of Working Capital [Abstract]

Components of Working Capital

7.  COMPONENTS OF WORKING CAPITAL

A summary of other current assets is as follows:

thousands	September 30, 2014		December 31, 2013
Natural gas liquids inventory	$	2,022	$	2,584
Natural gas imbalance receivables	1,181		3,605
Prepaid insurance	2,521		2,123
Other	1,049		1,710
Total other current assets	$	6,773	$	10,022

7.  COMPONENTS OF WORKING CAPITAL (CONTINUED)

A summary of accrued liabilities is as follows:

thousands	September 30, 2014		December 31, 2013
Accrued capital expenditures	$	92,559	$	94,750
Accrued plant purchases	30,563		21,396
Accrued interest expense	28,525		18,119
Short-term asset retirement obligations	483		1,966
Short-term remediation and reclamation obligations	562		562
Other	186		218
Total accrued liabilities	$	152,878	$	137,011

XML

Partnership Distributions - Cash Distributions Table (details) (USD $) In Thousands, except Per Share data, unless otherwise specified	3 Months Ended
	Sep. 30, 2014		Jun. 30, 2014	Mar. 31, 2014	Sep. 30, 2013	Jun. 30, 2013	Mar. 31, 2013
Distributions Made to Members or Limited Partners [Abstract]
Total quarterly distribution per unit	$ 0.675	[1]	$ 0.650	$ 0.625	$ 0.580	$ 0.560	$ 0.540
Total quarterly cash distribution	$ 111,609	[1]	$ 105,655	$ 98,749	$ 83,986	$ 79,315	$ 70,143

[1] On October 20, 2014, the board of directors of the Partnership’s general partner declared a cash distribution to the Partnership’s unitholders of $0.675 per unit, or $111.6 million in aggregate, including incentive distributions. The cash distribution is payable on November 13, 2014, to unitholders of record at the close of business on October 31, 2014.

XML

Debt and Interest Expense - Additional Information (details) (USD $)	9 Months Ended				12 Months Ended			1 Months Ended						0 Months Ended		1 Months Ended	9 Months Ended		1 Months Ended	9 Months Ended	1 Months Ended	9 Months Ended
	Sep. 30, 2014	Sep. 30, 2013		Sep. 30, 2014 Revolving Credit Facility [Member]	Dec. 31, 2013 Revolving Credit Facility [Member]	Feb. 28, 2014 Revolving Credit Facility [Member]	Mar. 31, 2011 Revolving Credit Facility [Member]	Feb. 28, 2014 Revolving Credit Facility [Member] Alternate Base Rate [Member]	Feb. 28, 2014 Minimum [Member] Revolving Credit Facility [Member]	Feb. 28, 2014 Minimum [Member] Revolving Credit Facility [Member] Alternate Base Rate [Member]	Feb. 28, 2014 Maximum [Member] Revolving Credit Facility [Member]	Feb. 28, 2014 Maximum [Member] Revolving Credit Facility [Member] Alternate Base Rate [Member]	Feb. 28, 2014 Percentage Above Federal Funds Effective Rate [Member] Revolving Credit Facility [Member] Alternate Base Rate [Member]	Mar. 03, 2014 Texas Express And Front Range [Member]		Mar. 31, 2014 Texas Express And Front Range [Member] Revolving Credit Facility [Member]	Sep. 30, 2014 Senior Notes 5 Point 375 Percent Due 2021 [Member]	Sep. 30, 2014 Senior Notes 4 Percent Due 2022 [Member]	Mar. 31, 2014 Senior Notes 2 Point 6 Percent Due 2018 [Member]	Sep. 30, 2014 Senior Notes 2 Point 6 Percent Due 2018 [Member]	Mar. 31, 2014 Senior Notes 5 Point 45 Percent Due 2044 [Member]	Sep. 30, 2014 Senior Notes 5 Point 45 Percent Due 2044 [Member]
Debt Instrument [Line Items]
Fixed interest rate																	5.375%	4.00%		2.60%		5.45%
Offering percent																			100.857%		98.443%
Effective interest rate																				2.743%		5.633%
Underwriting discount																			$ 600,000		$ 3,500,000
Debt instrument, maturity date																	Jun. 01, 2021	Jul. 01, 2022		Aug. 15, 2018		Apr. 01, 2044
Line of credit, expiration date				Feb. 26, 2019
Borrowings	1,136,878,000	842,566,000	[1]											350,000,000	[2]	350,000,000
Revolving credit facility, maximum borrowing capacity						1,200,000,000	800,000,000
Revolving credit facility, expandable maximum borrowing capacity						1,500,000,000
Interest rate percent above LIBOR								1.00%	0.975%	0.00%	1.45%	0.45%	0.50%
Revolving credit facility, interest rate at period end				1.46%	1.67%
Facility fee				0.20%	0.25%				0.15%		0.30%
Outstanding borrowings				170,000,000
Outstanding letters of credit				12,800,000
Available borrowing capacity				$ 1,000,000,000

[1] Financial information has been recast to include the financial position and results attributable to the TEFR Interests. See Note 1 and Note 2.

[2] The Partnership acquired a 20% interest in each of TEG and TEP and a 33.33% interest in FRP from Anadarko. These assets gather and transport NGLs primarily from the Anadarko and Denver-Julesburg Basins. The interests in these entities are accounted for under the equity method of accounting. In connection with the issuance of the common units, the Partnership’s general partner purchased 6,296 general partner units for consideration of $0.4 million to maintain its 2.0% general partner interest in the Partnership.

XML

Description of Business and Basis of Presentation (tables)

9 Months Ended

Sep. 30, 2014

Accounting Policies [Abstract]

Assets Table

As of September 30, 2014, the Partnership’s assets and investments accounted for under the equity method consisted of the following:

	Owned and Operated	Operated Interests	Non-Operated Interests	Equity Interests
Natural gas gathering systems	13	1	5	2
NGL gathering systems	—	—	—	2
Natural gas treating facilities	8	—	—	1
Natural gas processing facilities	9	3	—	2
NGL pipelines	3	—	—	2
Natural gas pipelines	3	—	—	—
Oil pipeline	—	—	—	1

Equity Investments Table

The following table presents the activity in the Partnership’s equity investments for the nine months ended September 30, 2014:

	Equity Investments
thousands	Fort Union			White Cliffs			Rendezvous			Mont Belvieu JV			TEG			TEP			FRP			Total
Balance at December 31, 2013	$	25,172		$	35,039		$	60,928		$	122,480		$	16,649		$	197,731		$	135,401		$	593,400
Investment earnings (loss), net of amortization	4,811			8,385			1,180			22,872			466			3,488			120			41,322
Contributions	—			10,456			—			3,956			352			6,263			40,033			61,060
Capitalized interest	—			—			—			—			—			—			857			857
Distributions	(4,619		)	(7,949		)	(2,636		)	(24,423		)	(373		)	(2,938		)	(123		)	(43,061		)
Distributions in excess of cumulative earnings (1)	—			(891		)	(1,993		)	—			(338		)	(5,321		)	(5,844		)	(14,387		)
Balance at September 30, 2014	$	25,364		$	45,040		$	57,479		$	124,885		$	16,756		$	199,223		$	170,444		$	639,191

⁽¹⁾  Distributions in excess of cumulative earnings, classified as investing cash flows in the consolidated statements of cash flows, is calculated on an individual investment basis.

XML

Property, Plant and Equipment (table)

9 Months Ended

Sep. 30, 2014

Property, Plant and Equipment [Abstract]

Property, Plant and Equipment Table

A summary of the historical cost of the Partnership’s property, plant and equipment is as follows:

thousands	Estimated Useful Life	September 30, 2014		December 31, 2013
Land	n/a	$	2,584	$	2,584
Gathering systems	3 to 47 years	4,244,640		3,673,008
Pipelines and equipment	15 to 45 years	145,851		146,008
Assets under construction	n/a	345,799		405,633
Other	3 to 40 years	15,405		11,867
Total property, plant and equipment		4,754,279		4,239,100
Accumulated depreciation		986,692		855,845
Net property, plant and equipment		$	3,767,587	$	3,383,255

XML

Debt and Interest Expense - Debt Activity Table (details) (USD $) In Thousands, unless otherwise specified	9 Months Ended
	Sep. 30, 2014
Debt Instrument [Line Items]
Beginning Balance	$ 1,418,169	[1]
Other	(5,255)
Ending Balance	2,082,914
Revolving Credit Facility [Member]
Debt Instrument [Line Items]
Beginning Balance	0
Borrowings	650,000
Repayments	(480,000)
Ending Balance	170,000
Senior Notes 5 Point 45 Percent Due 2044 [Member]
Debt Instrument [Line Items]
Beginning Balance	0
Borrowings	400,000
Ending Balance	393,815
Senior Notes 2 Point 6 Percent Due 2018 [Member]
Debt Instrument [Line Items]
Beginning Balance	249,718
Borrowings	100,000
Ending Balance	$ 350,506

[1] Financial information has been recast to include the financial position and results attributable to the TEFR Interests. See Note 1 and Note 2.

XML

Transactions With Affiliates - Equipment Purchases and Sales Table (details) (USD $) In Thousands, unless otherwise specified	9 Months Ended
	Sep. 30, 2014	Sep. 30, 2013
Related Party Transaction [Line Items]
Partners' capital adjustment	$ 6,398	$ 4,080	[1]
Affiliated Entity [Member] | Purchases [Member]
Related Party Transaction [Line Items]
Consideration given for equipment	16,143	6,167
Net carrying value	9,745	2,039
Partners' capital adjustment	6,398	4,128
Affiliated Entity [Member] | Sales [Member]
Related Party Transaction [Line Items]
Consideration received for equipment	0	82
Net carrying value	0	34
Partners' capital adjustment	$ 0	$ 48

[1] Financial information has been recast to include the financial position and results attributable to the TEFR Interests. See Note 1 and Note 2.

XML

Consolidated Balance Sheets (Parenthetical) (USD $) In Thousands, except Share data, unless otherwise specified	Sep. 30, 2014		Dec. 31, 2013
Common units issued	119,070,104		117,322,812
Common units outstanding	119,070,104		117,322,812
General partner units issued			2,394,345
General partner units outstanding	2,430,007		2,394,345
Accounts receivable, net	$ 126,345	[1]	$ 84,060	[1],[2]
Other current assets	6,773	[3]	10,022	[2],[3]
Accounts and natural gas imbalance payables	27,011	[4]	39,589	[2],[4]
Accrued liabilities	152,878	[5]	137,011	[2],[5]
Affiliated Entity [Member]
Accounts receivable, net	87,300		47,900
Other current assets	100		100
Accounts and natural gas imbalance payables	100		2,300
Accrued liabilities	$ 0		$ 100

[1] Accounts receivable, net includes amounts receivable from affiliates (as defined in Note 1) of $87.3 million and $47.9 million as of September 30, 2014, and December 31, 2013, respectively.

[2] Financial information has been recast to include the financial position and results attributable to the TEFR Interests. See Note 1 and Note 2.

[3] Other current assets includes natural gas imbalance receivables from affiliates of $0.1 million as of September 30, 2014, and December 31, 2013.

[4] Accounts and natural gas imbalance payables includes amounts payable to affiliates of $0.1 million and $2.3 million as of September 30, 2014, and December 31, 2013, respectively.

[5] Accrued liabilities includes amounts payable to affiliates of zero and $0.1 million as of September 30, 2014, and December 31, 2013, respectively.

XML

Description of Business and Basis of Presentation

9 Months Ended

Sep. 30, 2014

Organization, Consolidation and Presentation of Financial Statements [Abstract]

Description of Business and Basis of Presentation

1.  DESCRIPTION OF BUSINESS AND BASIS OF PRESENTATION

General. Western Gas Partners, LP is a growth-oriented Delaware master limited partnership formed by Anadarko Petroleum Corporation in 2007 to own, operate, acquire and develop midstream energy assets.

For purposes of these consolidated financial statements, the “Partnership” refers to Western Gas Partners, LP and its subsidiaries. The Partnership’s general partner, Western Gas Holdings, LLC (the “general partner” or “GP”), is owned by Western Gas Equity Partners, LP (“WGP”), a Delaware master limited partnership formed by Anadarko Petroleum Corporation in September 2012 to own the Partnership’s general partner, as well as a significant limited partner interest in the Partnership (see Western Gas Equity Partners, LP below). Western Gas Equity Holdings, LLC is WGP’s general partner and is a wholly owned subsidiary of Anadarko Petroleum Corporation. “Anadarko” refers to Anadarko Petroleum Corporation and its subsidiaries, excluding the Partnership and the general partner, and “affiliates” refers to subsidiaries of Anadarko, excluding the Partnership, and includes equity interests in Fort Union Gas Gathering, LLC (“Fort Union”), White Cliffs Pipeline, LLC (“White Cliffs”), Rendezvous Gas Services, LLC (“Rendezvous”), Enterprise EF78, LLC (the “Mont Belvieu JV”), Texas Express Pipeline LLC (“TEP”), Texas Express Gathering LLC (“TEG”) and Front Range Pipeline LLC (“FRP”) (see Note 2). The interests in TEP, TEG and FRP are referred to collectively as the “TEFR Interests.” All income earned on, distributions from and contributions to the Partnership’s equity investments are considered to be affiliate transactions. “Equity investment throughput” refers to the Partnership’s 14.81% share of average Fort Union throughput and 22% share of average Rendezvous throughput, but excludes throughput measured in barrels, consisting of the Partnership’s 10% share of average White Cliffs throughput, 25% share of average Mont Belvieu JV throughput, 20% share of average TEP and TEG throughput and 33.33% share of average FRP throughput. The “DJ Basin complex” refers to the Platte Valley system, Wattenberg system, and Lancaster plant, all of which were combined into a single complex in the first quarter of 2014.

The Partnership is engaged in the business of gathering, processing, compressing, treating and transporting natural gas, condensate, NGLs and crude oil for Anadarko, as well as for third-party producers and customers. As of September 30, 2014, the Partnership’s assets and investments accounted for under the equity method consisted of the following:

	Owned and Operated	Operated Interests	Non-Operated Interests	Equity Interests
Natural gas gathering systems	13	1	5	2
NGL gathering systems	—	—	—	2
Natural gas treating facilities	8	—	—	1
Natural gas processing facilities	9	3	—	2
NGL pipelines	3	—	—	2
Natural gas pipelines	3	—	—	—
Oil pipeline	—	—	—	1

These assets and investments are located in the Rocky Mountains (Colorado, Utah and Wyoming), the Mid-Continent (Kansas and Oklahoma), north-central Pennsylvania and Texas. The Partnership completed construction of Train I at the Lancaster processing plant (located in the DJ Basin complex) in Northeast Colorado in April 2014, and is constructing Train II at the same plant with operations expected to commence in the second quarter of 2015.

Western Gas Equity Partners, LP. WGP owns the following types of interests in the Partnership: (i) the 2.0% general partner interest and all of the incentive distribution rights (“IDRs”) in the Partnership, both owned through WGP’s 100% ownership of the Partnership’s general partner and (ii) a significant limited partner interest (see Holdings of Partnership equity in Note 4). WGP has no independent operations or material assets other than its partnership interests in the Partnership.

1.  DESCRIPTION OF BUSINESS AND BASIS OF PRESENTATION (CONTINUED)

Basis of presentation. The consolidated financial statements have been prepared in accordance with generally accepted accounting principles in the United States (“GAAP”). The consolidated financial statements include the accounts of the Partnership and entities in which it holds a controlling financial interest. All significant intercompany transactions have been eliminated. Investments in non-controlled entities over which the Partnership exercises significant influence are accounted for under the equity method. The Partnership proportionately consolidates its 33.75% share of the assets, liabilities, revenues and expenses attributable to the Non-Operated Marcellus Interest and Anadarko-Operated Marcellus Interest (see Note 2) and its 50% share of the assets, liabilities, revenues and expenses attributable to the Newcastle system in the accompanying consolidated financial statements. The 25% membership interest in Chipeta Processing LLC (“Chipeta”) held by a third-party member is reflected within noncontrolling interest in the consolidated financial statements for all periods presented.

In preparing financial statements in accordance with GAAP, management makes informed judgments and estimates that affect the reported amounts of assets, liabilities, revenues and expenses. Management evaluates its estimates and related assumptions regularly, using historical experience and other methods considered reasonable under the particular circumstances. Changes in facts and circumstances or additional information may result in revised estimates and actual results may differ from these estimates. Effects on the business, financial condition and results of operations resulting from revisions to estimates are recognized when the facts that give rise to the revisions become known. The information furnished herein reflects all normal recurring adjustments which are, in the opinion of management, necessary for a fair presentation of the consolidated financial statements, and certain prior-period amounts have been reclassified to conform to the current-year presentation.

Certain information and note disclosures commonly included in annual financial statements have been condensed or omitted pursuant to the rules and regulations of the Securities and Exchange Commission (“SEC”). Accordingly, the accompanying consolidated financial statements and notes should be read in conjunction with the Partnership’s 2013 Form 10-K, as filed with the SEC on February 28, 2014, certain sections of which were recast to reflect the results of the TEFR Interests in the Partnership’s Current Report on Form 8-K, as filed with the SEC on August 27, 2014. Management believes that the disclosures made are adequate to make the information not misleading.

Presentation of Partnership assets. The “Partnership assets” refer collectively to the assets owned and interests accounted for under the equity method by the Partnership as of September 30, 2014. Because Anadarko controls the Partnership through its ownership and control of WGP, which owns the Partnership’s general partner, each acquisition of Partnership assets from Anadarko has been considered a transfer of net assets between entities under common control. As such, the Partnership assets acquired from Anadarko were initially recorded at Anadarko’s historic carrying value, which did not correlate to the total acquisition price paid by the Partnership. Further, after an acquisition of Partnership assets from Anadarko, the Partnership may be required to recast its financial statements to include the activities of the Partnership assets as of the date of common control. See Note 2.

For those periods requiring recast, the consolidated financial statements for periods prior to the Partnership’s acquisition of the Partnership assets from Anadarko have been prepared from Anadarko’s historical cost-basis accounts and may not necessarily be indicative of the actual results of operations that would have occurred if the Partnership had owned the Partnership assets during the periods reported. Net income attributable to the Partnership assets acquired from Anadarko for periods prior to the Partnership’s acquisition of the Partnership assets is not allocated to the limited partners for purposes of calculating net income per common unit.

1.  DESCRIPTION OF BUSINESS AND BASIS OF PRESENTATION (CONTINUED)

Equity investments.The following table presents the activity in the Partnership’s equity investments for the nine months ended September 30, 2014:

	Equity Investments
thousands	Fort Union			White Cliffs			Rendezvous			Mont Belvieu JV			TEG			TEP			FRP			Total
Balance at December 31, 2013	$	25,172		$	35,039		$	60,928		$	122,480		$	16,649		$	197,731		$	135,401		$	593,400
Investment earnings (loss), net of amortization	4,811			8,385			1,180			22,872			466			3,488			120			41,322
Contributions	—			10,456			—			3,956			352			6,263			40,033			61,060
Capitalized interest	—			—			—			—			—			—			857			857
Distributions	(4,619		)	(7,949		)	(2,636		)	(24,423		)	(373		)	(2,938		)	(123		)	(43,061		)
Distributions in excess of cumulative earnings (1)	—			(891		)	(1,993		)	—			(338		)	(5,321		)	(5,844		)	(14,387		)
Balance at September 30, 2014	$	25,364		$	45,040		$	57,479		$	124,885		$	16,756		$	199,223		$	170,444		$	639,191

⁽¹⁾  Distributions in excess of cumulative earnings, classified as investing cash flows in the consolidated statements of cash flows, is calculated on an individual investment basis.

Recently issued accounting standards. Accounting Standards Update (“ASU”) 2014-09, Revenue from Contracts with Customers, supersedes the revenue recognition requirements inTopic605, Revenue Recognition, and industry-specific guidance in Subtopic 932-605, Extractive Activities—Oil and Gas—Revenue Recognition, and requires an entity to recognize revenue when it transfers promised goods or services to customers in an amount that reflects the consideration to which the entity expects to be entitled in exchange for those goods or services. This ASU is effective for annual and interim periods beginning in 2017 and is required to be adopted using one of two retrospective application methods, with no early adoption permitted. The Partnership is currently evaluating the impact of the adoption of this ASU on its consolidated financial statements.

ASU 2014-08, Reporting Discontinued Operations and Disclosures of Disposals of Components of an Entity,changes the criteria for reporting discontinued operations and requires additional disclosures, both for discontinued operations and for individually significant dispositions and assets classified as held for sale not qualifying as discontinued operations. This ASU is effective for annual and interim periods beginning in 2015, with early adoption permitted for disposals or for assets classified as held for sale that have not been reported in previously issued financial statements. The Partnership early adopted this ASU on a prospective basis beginning with the first quarter of 2014. The adoption did not have a material impact on the Partnership’s consolidated financial statements.

ASU 2013-11, Presentation of an Unrecognized Tax Benefit When a Net Operating Loss Carryforward, a Similar Tax Loss, or a Tax Credit Carryforward Exists,requires that an unrecognized tax benefit, or a portion of an unrecognized tax benefit, be presented in the financial statements as a reduction to a deferred tax asset, except in certain circumstances. This ASU is effective for annual and interim periods beginning in 2014. The Partnership adopted this ASU on a prospective basis beginning with the first quarter of 2014. The adoption did not have a material impact on the Partnership’s consolidated financial statements.

XML

Components of Working Capital (tables)

9 Months Ended

Sep. 30, 2014

Components Of Working Capital [Abstract]

Other Current Assets Table

A summary of other current assets is as follows:

thousands	September 30, 2014		December 31, 2013
Natural gas liquids inventory	$	2,022	$	2,584
Natural gas imbalance receivables	1,181		3,605
Prepaid insurance	2,521		2,123
Other	1,049		1,710
Total other current assets	$	6,773	$	10,022

Accrued Liabilities Table

A summary of accrued liabilities is as follows:

thousands	September 30, 2014		December 31, 2013
Accrued capital expenditures	$	92,559	$	94,750
Accrued plant purchases	30,563		21,396
Accrued interest expense	28,525		18,119
Short-term asset retirement obligations	483		1,966
Short-term remediation and reclamation obligations	562		562
Other	186		218
Total accrued liabilities	$	152,878	$	137,011

XML

Equity and Partners' Capital - Additional Information (details)	9 Months Ended
	Sep. 30, 2014	Dec. 31, 2013
Schedule Of Investments [Line Items]
Common units owned	119,070,104	117,322,812
General partner units owned	2,430,007	2,394,345
General partner's interest	2.00%
Western Gas Equity Partners [Member]
Schedule Of Investments [Line Items]
Common units owned	49,296,205
Ownership interest	40.60%
General partner units owned	2,430,007
General partner's interest	2.00%
Other Subsidiaries Of Anadarko [Member]
Schedule Of Investments [Line Items]
Common units owned	757,619
Ownership interest	0.60%
Public [Member]
Schedule Of Investments [Line Items]
Common units owned	69,016,280
Ownership interest	56.80%
Incentive Distribution Rights [Member] | Western Gas Equity Partners [Member]
Schedule Of Investments [Line Items]
General partner's interest	100.00%

XML

Description of Business and Basis of Presentation (Policies)

9 Months Ended

Sep. 30, 2014

Organization, Consolidation and Presentation of Financial Statements [Abstract]

Business combinations policy

Presentation of Partnership assets. The “Partnership assets” refer collectively to the assets owned and interests accounted for under the equity method by the Partnership as of September 30, 2014. Because Anadarko controls the Partnership through its ownership and control of WGP, which owns the Partnership’s general partner, each acquisition of Partnership assets from Anadarko has been considered a transfer of net assets between entities under common control. As such, the Partnership assets acquired from Anadarko were initially recorded at Anadarko’s historic carrying value, which did not correlate to the total acquisition price paid by the Partnership. Further, after an acquisition of Partnership assets from Anadarko, the Partnership may be required to recast its financial statements to include the activities of the Partnership assets as of the date of common control. See Note 2.

For those periods requiring recast, the consolidated financial statements for periods prior to the Partnership’s acquisition of the Partnership assets from Anadarko have been prepared from Anadarko’s historical cost-basis accounts and may not necessarily be indicative of the actual results of operations that would have occurred if the Partnership had owned the Partnership assets during the periods reported. Net income attributable to the Partnership assets acquired from Anadarko for periods prior to the Partnership’s acquisition of the Partnership assets is not allocated to the limited partners for purposes of calculating net income per common unit.

TEFR Interests acquisition. Because the acquisition of the TEFR Interests was a transfer of net assets between entities under common control, the Partnership’s historical financial statements previously filed with the SEC have been recast in this Form 10-Q to include the results attributable to the TEFR Interests for all periods presented. The consolidated financial statements for periods prior to the Partnership’s acquisition of the TEFR Interests have been prepared from Anadarko’s historical cost-basis accounts and may not necessarily be indicative of the actual results of operations that would have occurred if the Partnership had owned the TEFR Interests during the periods reported.

Net income per common unit policy

The Partnership’s net income earned on and subsequent to the date of the acquisition of the Partnership assets (as defined in Note 1) is allocated to the general partner and the limited partners consistent with actual cash distributions, including incentive distributions allocable to the general partner. Undistributed earnings (net income in excess of distributions) or undistributed losses (available cash in excess of net income) are then allocated to the general partner and the limited partners in accordance with their respective ownership percentages.

Fair value policy

Note receivable from Anadarko. Concurrently with the closing of the Partnership’s May 2008 initial public offering, the Partnership loaned $260.0 million to Anadarko in exchange for a 30-year note bearing interest at a fixed annual rate of 6.50%, payable quarterly. The fair value of the note receivable from Anadarko was $322.3 million and $296.7 million at September 30, 2014, and December 31, 2013, respectively. The fair value of the note reflects consideration of credit risk and any premium or discount for the differential between the stated interest rate and quarter-end market interest rate, based on quoted market prices of similar debt instruments. Accordingly, the fair value of the note receivable from Anadarko is measured using Level 2 inputs.

During the first quarter of 2014, the Partnership recognized a $1.2 million impairment primarily related to a non-operational plant in the Powder River Basin that was impaired to its estimated fair value of $2.4 million, using Level 3 fair-value inputs.

Use of estimates policy

In preparing financial statements in accordance with GAAP, management makes informed judgments and estimates that affect the reported amounts of assets, liabilities, revenues and expenses. Management evaluates its estimates and related assumptions regularly, using historical experience and other methods considered reasonable under the particular circumstances. Changes in facts and circumstances or additional information may result in revised estimates and actual results may differ from these estimates. Effects on the business, financial condition and results of operations resulting from revisions to estimates are recognized when the facts that give rise to the revisions become known. The information furnished herein reflects all normal recurring adjustments which are, in the opinion of management, necessary for a fair presentation of the consolidated financial statements, and certain prior-period amounts have been reclassified to conform to the current-year presentation.