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OPERATING REVENUES
 9 Months Ended
Sep. 30, 2021
Revenue from Contract with Customer [Abstract]  
OPERATING REVENUES OPERATING REVENUES
For more information about our operating revenues, see Note 1(d), Operating Revenues, in our 2020 Annual Report on Form 10-K.

Disaggregation of Operating Revenues

The following tables present our operating revenues disaggregated by revenue source for our utility segment. We do not have any revenues associated with our other segment. We disaggregate revenues into categories that depict how the nature, amount, timing, and uncertainty of revenues and cash flows are affected by economic factors. Revenues are further disaggregated by electric and natural gas operations and then by customer class. Each customer class within our electric and natural gas operations have different expectations of service, energy and demand requirements, and can be impacted differently by regulatory activities within their jurisdictions.
Three Months Ended September 30Nine Months Ended September 30
(in millions)2021202020212020
Wisconsin Electric Power Company
Electric utility$905.0 $853.2 $2,447.4 $2,289.5 
Natural gas utility50.2 44.7 328.3 245.6 
Total revenues from contracts with customers955.2 897.9 2,775.7 2,535.1 
Other operating revenues3.6 2.3 15.8 5.6 
Total operating revenues$958.8 $900.2 $2,791.5 $2,540.7 
Revenues from Contracts with Customers

Electric Utility Operating Revenues

The following table disaggregates electric utility operating revenues into customer class:
Three Months Ended September 30Nine Months Ended September 30
(in millions)2021202020212020
Residential$385.3 $373.8 $1,005.1 $981.2 
Small commercial and industrial282.4 265.3 773.6 723.8 
Large commercial and industrial168.0 159.4 435.1 405.1 
Other4.7 4.5 14.9 14.2 
Total retail revenues840.4 803.0 2,228.7 2,124.3 
Wholesale16.3 19.2 55.0 56.9 
Resale42.8 29.1 135.4 90.3 
Steam2.7 2.5 21.7 15.0 
Other utility revenues2.8 (0.6)6.6 3.0 
Total electric utility operating revenues$905.0 $853.2 $2,447.4 $2,289.5 

Natural Gas Utility Operating Revenues

The following table disaggregates natural gas utility operating revenues into customer class:
Three Months Ended September 30Nine Months Ended September 30
(in millions)2021202020212020
Residential$30.7 $23.7 $213.7 $162.4 
Commercial and industrial13.1 7.1 97.3 64.4 
Total retail revenues43.8 30.8 311.0 226.8 
Transportation3.5 3.2 12.6 11.7 
Other utility revenues (1)
2.9 10.7 4.7 7.1 
Total natural gas utility operating revenues$50.2 $44.7 $328.3 $245.6 

(1)Includes the revenues subject to our purchased gas recovery mechanism. As these amounts are billed to customers, they are reflected in retail revenues with an offsetting decrease in other utility revenues.

Other Operating Revenues

Other operating revenues consist primarily of the following:
Three Months Ended September 30Nine Months Ended September 30
(in millions)2021202020212020
Late payment charges (1)
$2.7 $0.7 $10.8 $3.4 
Rental revenues0.3 0.3 2.7 2.6 
Alternative revenues (2)
0.6 1.3 2.3 (0.4)
Total other operating revenues$3.6 $2.3 $15.8 $5.6 

(1)The increase in late payment charges during the three and nine months ended September 30, 2021, compared with the same periods in 2020, was a result of the expiration of a regulatory order from the PSCW in response to the COVID-19 pandemic, which included the suspension of late payment charges during a designated time period. See Note 20, Regulatory Environment, for more information.

(2)Negative amounts can result from alternative revenues being reversed to revenues from contracts with customers as the customer is billed for these alternative revenues. Negative amounts can also result from revenues to be refunded to wholesale customers subject to true-up, as discussed in Note 1(d), Operating Revenues, in our 2020 Annual Report on Form 10-K.