Revenues

12 Months Ended

Dec. 31, 2018

Revenue from Contract with Customer [Abstract]

Revenue from Contract with Customer [Text Block]

Revenues

Revenue is classified by the type of goods/services rendered and market/customer type. SPS’ operating revenues (subsequent to adoption of the revised revenue guidance) consists of the following:

(Millions of Dollars)	Year Ended Dec. 31, 2018
Major product lines
Revenue from contracts with customers:
Residential	$	363.7
C&I	828.3
Other	44.7
Total retail	1,236.7
Wholesale	426.0
Transmission	231.1
Other	12.8
Total revenue from contracts with customers	1,906.6
Alternative revenue and other	26.6
Total revenues	$	1,933.2