Revenues

6 Months Ended

Jun. 30, 2021

Revenue from Contract with Customer [Abstract]

Revenue

Revenue is classified by the type of goods/services rendered and market/customer type. SPS’ operating revenues consisted of the following:

	Three Months Ended June 30
(Millions of Dollars)	2021		2020
Major revenue types
Revenue from contracts with customers:
Residential	$	85	$	85
C&I	201		164
Other	10		8
Total retail	296		257
Wholesale	118		82
Transmission	72		76
Other	2		—
Total revenue from contracts with customers	488		415
Alternative revenue and other	10		8
Total revenues	$	498	$	423

	Six Months Ended June 30
(Millions of Dollars)	2021		2020
Major revenue types
Revenue from contracts with customers:
Residential	$	176	$	158
C&I	389		333
Other	19		16
Total retail	584		507
Wholesale	676		155
Transmission	143		139
Other	5		1
Total revenue from contracts with customers	1,408		802
Alternative revenue and other	24		16
Total revenues	$	1,432	$	818