Related Party Transactions (Tables)

12 Months Ended

Dec. 31, 2019

Related Party Transactions [Abstract]

Related Party Transactions

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

(Millions of Dollars)	2019		2018		2017
Operating expenses:
Purchased power	$	—	$	—	$	1.4
Other operating expenses — paid to Xcel Energy Services Inc.	192.0		195.1		196.6
Interest expense	0.2		0.6		—

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

	2019				2018
(Millions of Dollars)	Accounts Receivable		Accounts Payable		Accounts Receivable		Accounts Payable
NSP-Minnesota	$	4.2	$	—	$	4.7	$	—
PSCo	—		0.4		—		0.7
Other subsidiaries of Xcel Energy Inc.	—		20.0		5.8		19.2
	$	4.2	$	20.4	$	10.5	$	19.9