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OPERATING REVENUES
 3 Months Ended
Mar. 31, 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. 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 March 31, 2021      
Electric$1,095.0 $— $— $1,095.0 $— $— $— $1,095.0 
Natural gas627.3 693.5 225.6 1,546.4 14.6 — (13.3)1,547.7 
Total regulated revenues1,722.3 693.5 225.6 2,641.4 14.6 — (13.3)2,642.7 
Other non-utility revenues— — 4.7 4.7 23.2 — (1.6)26.3 
Total revenues from contracts with customers1,722.3 693.5 230.3 2,646.1 37.8 — (14.9)2,669.0 
Other operating revenues9.4 9.9 3.0 22.3 99.8 0.1 (99.8)
(1)
22.4 
Total operating revenues$1,731.7 $703.4 $233.3 $2,668.4 $137.6 $0.1 $(114.7)$2,691.4 

(in millions)WisconsinIllinoisOther StatesTotal Utility
Operations		Non-Utility Energy InfrastructureCorporate
and Other		Reconciling
Eliminations		WEC Energy Group Consolidated
Three Months Ended March 31, 2020      
Electric$1,034.6 $— $— $1,034.6 $— $— $— $1,034.6 
Natural gas458.9 433.6 139.8 1,032.3 14.5 — (14.1)1,032.7 
Total regulated revenues1,493.5 433.6 139.8 2,066.9 14.5 — (14.1)2,067.3 
Other non-utility revenues— — 4.4 4.4 16.4 0.4 (1.6)19.6 
Total revenues from contracts with customers1,493.5 433.6 144.2 2,071.3 30.9 0.4 (15.7)2,086.9 
Other operating revenues5.4 14.0 2.2 21.6 98.7 0.1 (98.7)
(1)
21.7 
Total operating revenues$1,498.9 $447.6 $146.4 $2,092.9 $129.6 $0.5 $(114.4)$2,108.6 
(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 Utility Operating Revenues

The following table disaggregates electric utility operating revenues into customer class:
Electric Utility Operating Revenues
Three Months Ended March 31
(in millions)20212020
Residential$423.7 $404.9 
Small commercial and industrial331.4 323.6 
Large commercial and industrial209.5 194.6 
Other7.8 7.3 
Total retail revenues972.4 930.4 
Wholesale39.7 42.1 
Resale62.7 45.2 
Steam14.8 8.4 
Other utility revenues5.4 8.5 
Total electric utility operating revenues$1,095.0 $1,034.6 

Natural Gas Utility Operating Revenues

The following tables disaggregate natural gas utility operating revenues into customer class:
(in millions)WisconsinIllinoisOther StatesTotal Natural Gas Utility Operating Revenues
Three Months Ended March 31, 2021   
Residential$347.6 $333.9 $87.9 $769.4 
Commercial and industrial176.4 102.7 43.9 323.0 
Total retail revenues524.0 436.6 131.8 1,092.4 
Transport24.4 74.2 11.0 109.6 
Other utility revenues (1)
78.9 182.7 82.8 344.4 
Total natural gas utility operating revenues$627.3 $693.5 $225.6 $1,546.4 

(in millions)WisconsinIllinoisOther StatesTotal Natural Gas Utility Operating Revenues
Three Months Ended March 31, 2020   
Residential$313.1 $282.9 $95.3 $691.3 
Commercial and industrial151.3 91.4 51.7 294.4 
Total retail revenues464.4 374.3 147.0 985.7 
Transport24.1 72.7 10.5 107.3 
Other utility revenues (1)
(29.6)(13.4)(17.7)(60.7)
Total natural gas utility operating revenues$458.9 $433.6 $139.8 $1,032.3 

(1)Includes revenues subject to collection from (refund to) customers for purchased gas adjustment costs.

Other Natural Gas Operating Revenues

We have other natural gas operating revenues from Bluewater, which is in our non-utility energy infrastructure segment. Bluewater has entered into long-term service agreements for natural gas storage services with WE, WPS, and WG, and also provides limited service to unaffiliated customers. All amounts associated with the service agreements with WE, WPS, and WG have been eliminated at the consolidated level.
Other Non-Utility Operating Revenues

Other non-utility operating revenues consist primarily of the following:
Three Months Ended March 31
(in millions)20212020
Wind generation revenues$15.8 $9.3 
We Power revenues (1)
5.8 5.5 
Appliance service revenues4.7 4.4 
Distributed renewable solar project revenues— 0.4 
Total other non-utility operating revenues$26.3 $19.6 

(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, and we continually amortize the deferred carrying costs to revenues over the related lease term that We Power has with WE. During the three months ended March 31, 2021 and 2020, we recorded $5.8 million and $5.5 million, respectively, of revenues related to these deferred carrying costs. These contract liabilities are presented as deferred revenue, net on our balance sheets.

Other Operating Revenues

Other operating revenues consist primarily of the following:
Three Months Ended March 31
(in millions)20212020
Late payment charges$15.0 $12.1 
Alternative revenues6.2 8.5 
Other1.2 1.1 
Total other operating revenues$22.4 $21.7