Related Party Transactions (Tables)

12 Months Ended

Dec. 31, 2018

Significant affiliate transactions among the companies and related parties for the years ended Dec. 31:



(Millions of Dollars)	2018		2017		2016
Operating expenses:
Purchased power	$	—	$	1.4	$	8.8
Other operating expenses — paid to Xcel Energy Services Inc.	195.1		196.6		188.2
Interest expense	0.6		—		0.2

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



	2018				2017
(Millions of Dollars)	Accounts Receivable		Accounts Payable		Accounts Receivable		Accounts Payable
NSP-Minnesota	$	4.7	$	—	$	1.0	$	—
PSCo	—		0.7		—		0.3
Other subsidiaries of Xcel Energy Inc.	5.8		19.2		0.3		22.3
	$	10.5	$	19.9	$	1.3	$	22.6