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OPERATING REVENUES (Tables)
 6 Months Ended
Jun. 30, 2021
Disaggregation of Operating Revenues  
Operating revenues disaggregated by revenue source
Disaggregation of Operating Revenues

The following tables present our operating revenues disaggregated by revenue source. We do not have any revenues associated with our electric transmission segment, which includes investments accounted for using the equity method. We disaggregate revenues into categories that depict how the nature, amount, timing, and uncertainty of revenues and cash flows are affected by economic factors. For our segments, 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.
(in millions)WisconsinIllinoisOther StatesTotal Utility
Operations		Non-Utility Energy InfrastructureCorporate
and Other		Reconciling
Eliminations		WEC Energy Group Consolidated
Three Months Ended June 30, 2021      
Electric$1,083.2 $— $— $1,083.2 $— $— $— $1,083.2 
Natural gas212.7 266.1 66.9 545.7 9.4 — (8.7)546.4 
Total regulated revenues1,295.9 266.1 66.9 1,628.9 9.4 — (8.7)1,629.6 
Other non-utility revenues— — 4.4 4.4 24.2 — (3.9)24.7 
Total revenues from contracts with customers1,295.9 266.1 71.3 1,633.3 33.6 — (12.6)1,654.3 
Other operating revenues11.6 9.4 0.8 21.8 99.9 0.1 (99.9)
(1)
21.9 
Total operating revenues$1,307.5 $275.5 $72.1 $1,655.1 $133.5 $0.1 $(112.5)$1,676.2 

(in millions)WisconsinIllinoisOther StatesTotal Utility
Operations		Non-Utility Energy InfrastructureCorporate
and Other		Reconciling
Eliminations		WEC Energy Group Consolidated
Three Months Ended June 30, 2020      
Electric$999.6 $— $— $999.6 $— $— $— $999.6 
Natural gas207.8 254.5 62.4 524.7 8.7 — (8.2)525.2 
Total regulated revenues1,207.4 254.5 62.4 1,524.3 8.7 — (8.2)1,524.8 
Other non-utility revenues— — 4.2 4.2 17.1 0.8 (3.9)18.2 
Total revenues from contracts with customers1,207.4 254.5 66.6 1,528.5 25.8 0.8 (12.1)1,543.0 
Other operating revenues(1.2)6.7 0.1 5.6 99.5 0.1 (99.5)
(1)
5.7 
Total operating revenues$1,206.2 $261.2 $66.7 $1,534.1 $125.3 $0.9 $(111.6)$1,548.7 

(in millions)WisconsinIllinoisOther StatesTotal Utility
Operations		Non-Utility Energy InfrastructureCorporate
and Other		Reconciling
Eliminations		WEC Energy Group Consolidated
Six Months Ended June 30, 2021      
Electric$2,178.2 $— $— $2,178.2 $— $— $— $2,178.2 
Natural gas840.0 959.6 292.5 2,092.1 24.0 — (22.0)2,094.1 
Total regulated revenues3,018.2 959.6 292.5 4,270.3 24.0 — (22.0)4,272.3 
Other non-utility revenues— — 9.1 9.1 47.4 — (5.5)51.0 
Total revenues from contracts with customers3,018.2 959.6 301.6 4,279.4 71.4 — (27.5)4,323.3 
Other operating revenues21.0 19.3 3.8 44.1 199.7 0.2 (199.7)
(1)
44.3 
Total operating revenues$3,039.2 $978.9 $305.4 $4,323.5 $271.1 $0.2 $(227.2)$4,367.6 
(in millions)WisconsinIllinoisOther StatesTotal Utility
Operations		Non-Utility Energy InfrastructureCorporate
and Other		Reconciling
Eliminations		WEC Energy Group Consolidated
Six Months Ended June 30, 2020      
Electric$2,034.2 $— $— $2,034.2 $— $— $— $2,034.2 
Natural gas666.7 688.1 202.2 1,557.0 23.2 — (22.3)1,557.9 
Total regulated revenues2,700.9 688.1 202.2 3,591.2 23.2 — (22.3)3,592.1 
Other non-utility revenues— — 8.6 8.6 33.5 1.2 (5.5)37.8 
Total revenues from contracts with customers2,700.9 688.1 210.8 3,599.8 56.7 1.2 (27.8)3,629.9 
Other operating revenues4.2 20.7 2.3 27.2 198.2 0.2 (198.2)
(1)
27.4 
Total operating revenues$2,705.1 $708.8 $213.1 $3,627.0 $254.9 $1.4 $(226.0)$3,657.3 

(1)Amounts eliminated represent lease revenues related to certain plants that We Power leases to WE to supply electricity to its customers. Lease payments are billed from We Power to WE and then recovered in WE's rates as authorized by the PSCW and the FERC. WE operates the plants and is authorized by the PSCW and state law to fully recover prudently incurred operating and maintenance costs in electric rates.
Revenues from contracts with customers | Electric  
Disaggregation of Operating Revenues  
Operating revenues disaggregated by revenue source
The following table disaggregates electric utility operating revenues into customer class:
Three Months Ended June 30Six Months Ended June 30
(in millions)2021202020212020
Residential$419.0 $418.7 $842.7 $823.6 
Small commercial and industrial346.6 307.1 678.0 630.7 
Large commercial and industrial224.5 187.8 434.0 382.4 
Other6.9 6.9 14.7 14.2 
Total retail revenues997.0 920.5 1,969.4 1,850.9 
Wholesale38.6 41.3 78.3 83.4 
Resale37.4 28.4 100.1 73.6 
Steam4.2 4.1 19.0 12.5 
Other utility revenues6.0 5.3 11.4 13.8 
Total electric utility operating revenues$1,083.2 $999.6 $2,178.2 $2,034.2 
Revenues from contracts with customers | Natural gas  
Disaggregation of Operating Revenues  
Operating revenues disaggregated by revenue source
The following tables disaggregate natural gas utility operating revenues into customer class:
(in millions)WisconsinIllinoisOther StatesTotal Natural Gas Utility Operating Revenues
Three Months Ended June 30, 2021   
Residential$188.6 $199.1 $37.9 $425.6 
Commercial and industrial90.2 51.5 17.3 159.0 
Total retail revenues278.8 250.6 55.2 584.6 
Transportation17.8 48.8 6.6 73.2 
Other utility revenues (1)
(83.9)(33.3)5.1 (112.1)
Total natural gas utility operating revenues$212.7 $266.1 $66.9 $545.7 
(in millions)WisconsinIllinoisOther StatesTotal Natural Gas Utility Operating Revenues
Three Months Ended June 30, 2020   
Residential$125.8 $157.4 $40.0 $323.2 
Commercial and industrial47.0 36.5 16.6 100.1 
Total retail revenues172.8 193.9 56.6 423.3 
Transportation17.0 46.3 7.0 70.3 
Other utility revenues (1)
18.0 14.3 (1.2)31.1 
Total natural gas utility operating revenues$207.8 $254.5 $62.4 $524.7 

(in millions)WisconsinIllinoisOther StatesTotal Natural Gas Utility Operating Revenues
Six Months Ended June 30, 2021   
Residential$536.2 $533.0 $125.8 $1,195.0 
Commercial and industrial266.6 154.2 61.2 482.0 
Total retail revenues802.8 687.2 187.0 1,677.0 
Transportation42.2 123.0 17.6 182.8 
Other utility revenues (1)
(5.0)149.4 87.9 232.3 
Total natural gas utility operating revenues$840.0 $959.6 $292.5 $2,092.1 

(in millions)WisconsinIllinoisOther StatesTotal Natural Gas Utility Operating Revenues
Six Months Ended June 30, 2020   
Residential$438.9 $440.3 $135.3 $1,014.5 
Commercial and industrial198.3 127.9 68.3 394.5 
Total retail revenues637.2 568.2 203.6 1,409.0 
Transportation41.1 119.0 17.5 177.6 
Other utility revenues (1)
(11.6)0.9 (18.9)(29.6)
Total natural gas utility operating revenues$666.7 $688.1 $202.2 $1,557.0 

(1)Includes the revenues subject to the purchased gas recovery mechanisms of our utilities. The negative amount for the three months ended June 30, 2021 primarily relates to the approval by our utility commissions to recover from customers, over the second quarter of 2021, the higher natural gas costs that were incurred as a result of the extreme winter weather conditions in February 2021. As these amounts were billed to customers, they were reflected in retail revenues with an offsetting decrease in other utility revenues. See Note 19, Regulatory Environment, for more information.
Revenues from contracts with customers | Other non-utility revenues  
Disaggregation of Operating Revenues  
Operating revenues disaggregated by revenue source
Other non-utility operating revenues consist primarily of the following:
Three Months Ended June 30Six Months Ended June 30
(in millions)2021202020212020
Wind generation revenues$14.5 $7.3 $30.3 $16.6 
We Power revenues (1)
5.8 5.8 11.6 11.3 
Appliance service revenues4.4 4.2 9.1 8.6 
Other— 0.9 — 1.3 
Total other non-utility operating revenues$24.7 $18.2 $51.0 $37.8 
(1)As part of the construction of the We Power electric generating units, we capitalized interest during construction, which is included in property, plant, and equipment. As allowed by the PSCW, we collected these carrying costs from WE's utility customers during construction. The equity portion of these carrying costs was recorded as a contract liability, which is presented as deferred revenue, net on our balance sheets. We continually amortize the deferred carrying costs to revenues over the related lease term that We Power has with WE.
Other operating revenues  
Disaggregation of Operating Revenues  
Operating revenues disaggregated by revenue source
Other operating revenues consist primarily of the following:
Three Months Ended June 30Six Months Ended June 30
(in millions)2021202020212020
Late payment charges (1)
$17.3 $— $32.3 $12.1 
Alternative revenues2.9 4.3 9.1 12.8 
Other1.7 1.4 2.9 2.5 
Total other operating revenues$21.9 $5.7 $44.3 $27.4 

(1)The increase in late payment charges during the three and six months ended June 30, 2021, compared with the same periods in 2020, was a result of the expiration of various regulatory orders from our utility commissions in response to the COVID-19 pandemic, which included the suspension of late payment charges during a designated time period. See Note 22, Regulatory Environment, for more information.