Related Party Transactions

12 Months Ended

Dec. 31, 2016

Xcel Energy Services Inc. provides management, administrative and other services for the subsidiaries of Xcel Energy Inc., including NSP-Wisconsin. The services are provided and billed to each subsidiary in accordance with service agreements executed by each subsidiary. NSP-Wisconsin 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.

The electric production and transmission costs of the entire NSP System are shared by NSP-Minnesota and NSP-Wisconsin. The Interchange Agreement provides for the sharing of all costs of generation and transmission facilities of the system, including capital costs.

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)	2016		2015		2014
Operating revenues:
Electric	$	170,483	$	163,255	$	145,102
Operating expenses:
Purchased power ^(a)	413,615		419,028		430,666
Transmission expense	61,920		54,070		43,876
Natural gas purchased for resale	41		45		90
Other operating expenses — paid to Xcel Energy Services Inc.	106,454		93,890		84,224
Interest expense	4		2		30


^(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:



	2016				2015
(Thousands of Dollars)	Accounts Receivable		Accounts Payable		Accounts Receivable		Accounts Payable
NSP-Minnesota	$	—	$	18,567	$	—	$	18,268
PSCo	—		974		—		71
SPS	333		—		71		—
Other subsidiaries of Xcel Energy Inc.	—		9,496		—		6,199
	$	333	$	29,037	$	71	$	24,538