Pioneer Southwest Energy Partners 8-K Other Events

EXHIBIT 99.1

SELECTED FINANCIAL DATA

In August 2009, the Partnership completed the 2009 Acquisition. Because the 2009 Acquisition represents a transaction between entities under common control, the Partnership’s historical financial information has been recast to include the historical accounting attributes of the assets acquired and liabilities assumed in the 2009 Acquisition for all periods presented. Accordingly, the following selected consolidated financial data has been recast from that presented in the Partnership’s 2008 Annual Report on Form 10-K.

Certain selected historical financial data shown below was derived from the Partnership’s recast audited consolidated financial statements as of December 31, 2008 and 2007, and for each of the years in the three-year period ended December 31, 2008 (collectively, the "Recast Financial Statements"), included as Exhibit 99.3 to this Report. The selected historical financial data as of December 31, 2006, 2005, and 2004 and for the years ended December 31, 2005 and 2004 was derived from recast unaudited financial statements.

The following recast selected financial data should be read in conjunction with the Partnership’s recast "Management’s Discussion and Analysis of Financial Condition and Results of Operations" and the Partnership’s Recast Financial Statements, included as Exhibits 99.2 and 99.3, respectively, to this Report.

			Year Ended December 31, (a)
			2008		2007		2006		2005		2004
Statements of Operations Data:			(in thousands, except per unit data)
	Revenues:
		Oil and gas	$	193,394	$	144,038	$	126,918	$	106,265	$	77,052
		Interest and other		192		-		-		-		-
				193,586		144,038		126,918		106,265		77,052
	Costs and expenses:
		Oil and gas production		38,807		27,879		24,133		19,589		16,144
		Production and ad valorem taxes		14,213		11,550		11,124		8,902		6,370
		Depletion, depreciation and amortization		11,582		11,382		9,678		7,943		7,058
		General and administrative		6,227		5,643		5,345		5,537		3,811
		Accretion of discount on asset retirement   obligations		144		143		136		127		233
		Interest		621		-		-		-		-
		Other, net		890		5		25		70		52
				72,484		56,602		50,441		42,168		33,668
	Income before taxes			121,102		87,436		76,477		64,097		43,384
	Income tax provision			(1,326)		(920)		(323)		-		-
	Net income		$	119,776	$	86,516	$	76,154	$	64,097	$	43,384
	Allocation of net income:
		Net income applicable to the Partnership   Predecessor	$	59,038	$	86,516	$	76,154	$	64,097	$	43,384
		Net income applicable to the Partnership		60,738		-		-		-		-
		Net income	$	119,776	$	86,516	$	76,154	$	64,097	$	43,384
	Allocation of net income applicable to the   Partnership:
		General partner's interest in net income	$	61
		Limited partners' interest in net income		60,677
		Net income applicable to the Partnership	$	60,738
	Net income per common unit – basic and diluted		$	2.02
	Weighted average common units outstanding –    basic and diluted			30,009
	Distributions declared per common unit		$	0.81
Balance Sheet Data (as of December 31):
	Total assets		$	367,164	$	217,702	$	209,687	$	174,399	$	151,589
	Long-term debt		$	-	$	-	$	-	$	-	$	-
	Partners' equity		$	347,831	$	207,569	$	196,498	$	164,576	$	144,834

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(a) The historical lease operating expense of the Partnership Predecessor includes the direct internal costs of Pioneer to operate the Partnership Properties. The lease operating expense of the Partnership’s Properties after they were acquired by the Partnership includes the COPAS Fee.

2