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Related Party Transactions (Tables)

12 Months Ended

Dec. 31, 2019

Significant affiliate transactions among the companies and related parties including billings under the Interchange Agreement for the years ended Dec. 31:



(Millions of Dollars)	2019		2018		2017
Operating revenues:
Electric	$	457.4	$	473.7	$	490.2
Gas	0.5		—		—
Operating expenses:
Purchased power	60.5		61.1		66.8
Transmission expense	116.2		96.8		110.5
Other operating expenses — paid to Xcel Energy Services Inc.	533.2		534.8		539.4
Interest expense	0.7		0.3		—

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



	2019				2018
(Millions of Dollars)	Accounts Receivable		Accounts Payable		Accounts Receivable		Accounts Payable
NSP-Wisconsin	$	7.9	$	—	$	11.0	$	—
PSCo	—		18.8		—		17.9
SPS	—		4.2		—		4.7
Other subsidiaries of Xcel Energy Inc.	35.9		53.0		—		87.1
	$	43.8	$	76.0	$	11.0	$	109.7