Related Party Transactions

12 Months Ended

Dec. 31, 2012

Related Party Transactions [Abstract]

Related Party Transactions

14.  Related Party Transactions

Xcel Energy Services Inc. provides management, administrative and other services for the subsidiaries of Xcel Energy Inc., including SPS. The services are provided and billed to each subsidiary in accordance with service agreements executed by each subsidiary. SPS uses the service 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 with the utility subsidiaries. See Note 4 for further discussion of this borrowing arrangement.

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

(Thousands of Dollars)	2012		2011		2010
Operating revenues:
Electric	$	6,539	$	7,187	$	6,805
Operating expenses:
Purchased power		9,271		10,896		9,428
Other operating expenses — paid to Xcel Energy Services Inc.		117,277		118,370		109,111
Interest expense		76		83		90
Interest income		10		1		25

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

	2012				2011
	Accounts		Accounts		Accounts		Accounts
(Thousands of Dollars)	Receivable		Payable		Receivable		Payable
NSP-Minnesota	$	3,820	$	-	$	1,314	$	-
NSP-Wisconsin		4		-		-		-
PSCo		-		69		-		319
Other subsidiaries of Xcel Energy Inc.		967		12,294		-		11,509
	$	4,791	$	12,363	$	1,314	$	11,828