Related Party Transactions

12 Months Ended

Dec. 31, 2011

Related Party Transactions [Abstract]

Related Party Transactions

15.   Related Party Transactions

Xcel Energy Services Inc. provides management, administrative and other services for the subsidiaries of Xcel Energy Inc., including PSCo.  The services are provided and billed to each subsidiary in accordance with service agreements executed by each subsidiary.  PSCo uses services provided by Xcel Energy Services Inc. whenever possible.  Costs are charged directly to the subsidiary and are allocated if they cannot be directly assigned.

Xcel Energy Inc., NSP-Minnesota, PSCo and SPS have established a utility money pool arrangement.  See Note 4 for further discussion.

The table below contains significant affiliate transactions among the companies and related parties for the years ended Dec. 31:

(Thousands of Dollars)	2011		2010		2009
Operating revenues:
Electric	$	10,896	$	9,428	$	7,751
Other		4,441		3,331		4,441
Operating expenses:
Purchased power		7,187		6,805		5,976
Other operating expenses - paid to Xcel Energy Services Inc.		338,889		307,136		295,934
Interest expense		112		104		586

Accounts receivable and payable with affiliates at Dec. 31 were:

	2011						2010
(Thousands of Dollars)	Accounts Receivable			Accounts Payable			Accounts Receivable			Accounts Payable
NSP-Minnesota		$	11,623		$	-		$	6,674		$	-
NSP-Wisconsin			112			-			164			-
SPS			319			-			2,606			-
Other subsidiaries of Xcel Energy Inc.			9			48,371			11,598			28,270
		$	12,063		$	48,371		$	21,042		$	28,270