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Operating Revenues
 12 Months Ended
Dec. 31, 2021
Revenue from Contract with Customer [Abstract]  
OPERATING REVENUES OPERATING REVENUES
For more information about our significant accounting policies related to operating revenues, see Note 1(d), Operating Revenues.

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
Year ended December 31, 2021      
Electric$4,516.6 $— $— $4,516.6 $— $— $— $4,516.6 
Natural gas1,490.3 1,630.3 494.0 3,614.6 46.8 — (43.8)3,617.6 
Total regulated revenues6,006.9 1,630.3 494.0 8,131.2 46.8 — (43.8)8,134.2 
Other non-utility revenues— — 17.8 17.8 92.8 — (9.1)101.5 
Total revenues from contracts with customers6,006.9 1,630.3 511.8 8,149.0 139.6 — (52.9)8,235.7 
Other operating revenues30.1 42.5 7.2 79.8 399.9 0.5 (399.9)
(1)
80.3 
Total operating revenues$6,037.0 $1,672.8 $519.0 $8,228.8 $539.5 $0.5 $(452.8)$8,316.0 

(in millions)WisconsinIllinoisOther StatesTotal Utility
Operations		Non-Utility Energy InfrastructureCorporate
and Other		Reconciling
Eliminations		WEC Energy Group Consolidated
Year ended December 31, 2020      
Electric$4,266.1 $— $— $4,266.1 $— $— $— $4,266.1 
Natural gas1,195.6 1,267.9 361.0 2,824.5 44.4 — (42.0)2,826.9 
Total regulated revenues5,461.7 1,267.9 361.0 7,090.6 44.4 — (42.0)7,093.0 
Other non-utility revenues— — 17.1 17.1 66.6 1.7 (9.1)76.3 
Total revenues from contracts with customers5,461.7 1,267.9 378.1 7,107.7 111.0 1.7 (51.1)7,169.3 
Other operating revenues11.8 54.0 6.0 71.8 397.5 0.5 (397.4)
(1)
72.4 
Total operating revenues$5,473.5 $1,321.9 $384.1 $7,179.5 $508.5 $2.2 $(448.5)$7,241.7 

(in millions)WisconsinIllinoisOther StatesTotal Utility
Operations		Non-Utility Energy InfrastructureCorporate
and Other		Reconciling
Eliminations		WEC Energy Group Consolidated
Year ended December 31, 2019      
Electric$4,307.7 $— $— $4,307.7 $— $— $— $4,307.7 
Natural gas1,324.1 1,332.4 411.6 3,068.1 47.4 — (44.1)3,071.4 
Total regulated revenues5,631.8 1,332.4 411.6 7,375.8 47.4 — (44.1)7,379.1 
Other non-utility revenues— 0.1 16.6 16.7 55.2 4.0 (5.7)70.2 
Total revenues from contracts with customers5,631.8 1,332.5 428.2 7,392.5 102.6 4.0 (49.8)7,449.3 
Other operating revenues15.3 24.6 (2.2)37.7 393.3 0.4 (357.6)
(1)
73.8 
Total operating revenues$5,647.1 $1,357.1 $426.0 $7,430.2 $495.9 $4.4 $(407.4)$7,523.1 

(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 Wisconsin 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:
Year Ended December 31
(in millions)202120202019
Residential$1,768.0 $1,743.9 $1,608.6 
Small commercial and industrial1,415.7 1,325.9 1,384.6 
Large commercial and industrial931.9 821.5 871.9 
Other29.3 29.0 29.6 
Total retail revenues4,144.9 3,920.3 3,894.7 
Wholesale157.7 174.0 189.5 
Resale161.9 130.4 163.1 
Steam28.7 21.3 23.3 
Other utility revenues23.4 20.1 37.1 
Total electric utility operating revenues$4,516.6 $4,266.1 $4,307.7 

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
Year ended December 31, 2021   
Residential$928.9 $1,017.9 $241.2 $2,188.0 
Commercial and industrial472.1 302.1 129.9 904.1 
Total retail revenues1,401.0 1,320.0 371.1 3,092.1 
Transportation80.0 231.2 31.8 343.0 
Other utility revenues (1)
9.3 79.1 91.1 179.5 
Total natural gas utility operating revenues$1,490.3 $1,630.3 $494.0 $3,614.6 

(in millions)WisconsinIllinoisOther StatesTotal Natural Gas Utility Operating Revenues
Year ended December 31, 2020   
Residential$752.6 $802.2 $220.8 $1,775.6 
Commercial and industrial338.1 221.0 115.8 674.9 
Total retail revenues1,090.7 1,023.2 336.6 2,450.5 
Transportation79.1 215.6 31.5 326.2 
Other utility revenues (1)
25.8 29.1 (7.1)47.8 
Total natural gas utility operating revenues$1,195.6 $1,267.9 $361.0 $2,824.5 

(in millions)WisconsinIllinoisOther StatesTotal Natural Gas Utility Operating Revenues
Year ended December 31, 2019   
Residential$837.9 $857.8 $258.2 $1,953.9 
Commercial and industrial419.9 261.7 148.7 830.3 
Total retail revenues1,257.8 1,119.5 406.9 2,784.2 
Transportation72.6 245.3 31.6 349.5 
Other utility revenues (1)
(6.3)(32.4)(26.9)(65.6)
Total natural gas utility operating revenues$1,324.1 $1,332.4 $411.6 $3,068.1 
(1)    Includes the revenues subject to the purchased gas recovery mechanisms of our utilities. The amounts for 2021 reflect the higher natural gas costs that were incurred as a result of the extreme winter weather conditions in February 2021. As these amounts are billed to customers, they are reflected in retail revenues with an offsetting decrease in other utility revenues. See Note 26, Regulatory Environment, for more information. In addition to costs related to the extreme weather event, we incurred higher natural gas costs throughout 2021, compared with 2020, as a result of an increase in the price of natural gas.

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:
Year Ended December 31
(in millions)202120202019
Wind generation revenues$60.3 $34.6 $24.0 
We Power revenues23.3 22.9 25.4 
Appliance service revenues17.8 17.1 16.6 
Other0.1 1.7 4.2 
Total other non-utility operating revenues$101.5 $76.3 $70.2 

Other Operating Revenues

Other operating revenues consist primarily of the following:
Year Ended December 31
(in millions)202120202019
Late payment charges (1)
$54.9 $29.4 $43.7 
Alternative revenues (2)
21.2 38.8 (9.6)
Other4.2 4.2 39.7 
Total other operating revenues$80.3 $72.4 $73.8 

(1)    The increase in late payment charges during 2021, compared with 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 26, Regulatory Environment, for more information.

The reduction in late payment charges in 2020, compared with 2019, was a result 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. PGL and NSG were authorized to implement a SPC rider for the recovery of these late payment charges related to COVID-19, thereby allowing them to record these late payment charges as alternative revenues. The total amount of late payment charges recorded as alternative revenues during the year ended December 31, 2020 was $8.5 million. See Note 26, 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 customers subject to decoupling mechanisms, wholesale true-ups, conservation improvement rider true-ups, and certain late payment charges, as discussed in Note 1(d), Operating Revenues.