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 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)	2016		2015		2014
Operating revenues:
Electric	$	8,809	$	8,632	$	9,614
Other	4,525		4,441		4,441
Operating expenses:
Purchased power	56		—		23
Other operating expenses — paid to Xcel Energy Services Inc.	446,086		414,620		454,250
Interest expense	149		211		158
Interest income	—		45		61

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	$	7,669	$	—	$	4,419	$	—
NSP-Wisconsin	974		—		71		—
SPS	745		—		414		—
Other subsidiaries of Xcel Energy Inc.	33		98,797		5		76,643
	$	9,421	$	98,797	$	4,909	$	76,643