Related Party Transactions (Tables)

12 Months Ended

Dec. 31, 2015

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)	2015		2014		2013
Operating revenues:
Electric	$	163,255	$	145,102	$	136,917
Operating expenses:
Purchased power ^(a)	419,028		430,666		416,173
Transmission expense	54,070		43,876		42,460
Natural gas purchased for resale	45		90		97
Other operating expenses — paid to Xcel Energy Services Inc.	93,890		84,224		61,531
Interest expense	2		30		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:



	2015				2014
(Thousands of Dollars)	Accounts Receivable		Accounts Payable		Accounts Receivable		Accounts Payable
NSP-Minnesota	$	—	$	18,268	$	—	$	17,333
PSCo	—		71		—		22
SPS	71		—		31		—
Other subsidiaries of Xcel Energy Inc.	—		6,199		—		9,169
	$	71	$	24,538	$	31	$	26,524