Revenue from Contracts with Customers (Tables)

3 Months Ended

Mar. 31, 2021

Disaggregation of Revenue [Line Items]

Disaggregation of Revenue [Table Text Block]

The following table presents OG&E's revenues from contracts with customers disaggregated by customer classification. OG&E's operating revenues disaggregated by customer classification can be found in "OG&E (Electric Utility) Results of Operations" within "Item 2. Management's Discussion and Analysis of Financial Condition and Results of Operations."

	Three Months Ended March 31,
(In millions)	2021		2020
Residential	$	568.2	$	166.9
Commercial	307.5		91.3
Industrial	146.7		41.5
Oilfield	160.8		38.2
Public authorities and street light	123.1		34.7
System sales revenues	1,306.3		372.6
Provision for rate refund	—		(0.6)
Integrated market	302.1		7.2
Transmission	36.3		34.2
Other	(23.7)		7.0
Revenues from contracts with customers (A)	$	1,621.0	$	420.4

(A) In February 2021, OG&E's service territory experienced an unprecedented, prolonged, cold spell that resulted in record winter peak demand for electricity and extremely high natural gas and purchased power prices. Operating revenues significantly increased due to increased cost of sales, which are recovered from customers, as a result of the February 2021 extreme cold weather event. For further discussion, see Note 15 and "Item 2. Management's Discussion and Analysis of Financial Condition and Results of Operation."