Related Party Transactions (Tables)

12 Months Ended

Dec. 31, 2017

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



(Thousands of Dollars)	2017		2016		2015
Operating revenues:
Electric	$	2	$	56	$	—
Operating expenses:
Purchased power	1,436		8,809		8,632
Other operating expenses — paid to Xcel Energy Services Inc.	196,558		188,175		197,134
Interest expense	—		189		156
Interest income	—		—		6

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



	2017				2016
(Thousands of Dollars)	Accounts Receivable		Accounts Payable		Accounts Receivable		Accounts Payable
NSP-Minnesota	$	964	$	—	$	935	$	—
NSP-Wisconsin	7		—		—		333
PSCo	—		279		—		745
Other subsidiaries of Xcel Energy Inc.	326		22,298		14		13,336
	$	1,297	$	22,577	$	949	$	14,414