Revenues

3 Months Ended

Mar. 31, 2021

Revenue from Contract with Customer [Abstract]

Revenues

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

	Three Months Ended March 31, 2021
(Millions of Dollars)	Electric		Natural Gas		All Other		Total
Major revenue types
Revenue from contracts with customers:
Residential	$	246	$	239	$	3	$	488
C&I	326		84		9		419
Other	12		—		—		12
Total retail	584		323		12		919
Wholesale	87		—		—		87
Transmission	18		—		—		18
Other	8		46		—		54
Total revenue from contracts with customers	697		369		12		1,078
Alternative revenue and other	36		46		1		83
Total revenues	$	733	$	415	$	13	$	1,161

	Three Months Ended March 31, 2020
(Millions of Dollars)	Electric		Natural Gas		All Other		Total
Major revenue types
Revenue from contracts with customers:
Residential	$	238	$	217	$	3	$	458
C&I	352		78		9		439
Other	12		—		—		12
Total retail	602		295		12		909
Wholesale	47		—		—		47
Transmission	13		—		—		13
Other	15		30		—		45
Total revenue from contracts with customers	677		325		12		1,014
Alternative revenue and other	35		7		1		43
Total revenues	$	712	$	332	$	13	$	1,057