Related Party Transactions (Tables)

12 Months Ended

Dec. 31, 2014

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



(Thousands of Dollars)	2014		2013		2012
Operating revenues:
Electric	$	145,102	$	136,917	$	125,344
Operating expenses:
Purchased power ^(a)	430,666		416,173		405,016
Transmission expense	43,876		42,460		44,942
Natural gas purchased for resale	90		97		116
Other operating expenses — paid to Xcel Energy Services Inc.	84,224		61,531		54,137
Interest expense	30		22		22


^(a)	Pursuant to orders issued by the PSCW in December 2013 and February 2014, the 2014 amounts do not reflect $5.2 million of purchased power expenses deferred as a regulatory asset and $11.0 million of transmission costs deferred as a regulatory liability billed to NSP-Wisconsin through the Interchange Agreement from NSP-Minnesota.

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



	2014				2013
(Thousands of Dollars)	Accounts Receivable		Accounts Payable		Accounts Receivable		Accounts Payable
NSP-Minnesota	$	—	$	17,333	$	—	$	18,584
PSCo	—		22		—		8
SPS	31		—		26		—
Other subsidiaries of Xcel Energy Inc.	—		9,169		1,569		6,394
	$	31	$	26,524	$	1,595	$	24,986