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Operating Revenues (Tables)
 12 Months Ended
Dec. 31, 2020
Disaggregation of Operating Revenues  
Operating revenues disaggregated by revenue source
(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)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)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 

(in millions)WisconsinIllinoisOther StatesTotal Utility
Operations		Non-Utility Energy InfrastructureCorporate
and Other		Reconciling
Eliminations		WEC Energy Group Consolidated
Year ended December 31, 2018      
Electric$4,432.4 $— $— $4,432.4 $— $— $— $4,432.4 
Natural gas1,350.6 1,406.9 428.4 3,185.9 45.4 — (36.4)3,194.9 
Total regulated revenues5,783.0 1,406.9 428.4 7,618.3 45.4 — (36.4)7,627.3 
Other non-utility revenues— 0.2 16.1 16.3 34.6 7.9 (5.8)53.0 
Total revenues from contracts with customers5,783.0 1,407.1 444.5 7,634.6 80.0 7.9 (42.2)7,680.3 
Other operating revenues11.7 (7.1)(6.3)(1.7)388.4 0.8 (388.3)(0.8)
Total operating revenues$5,794.7 $1,400.0 $438.2 $7,632.9 $468.4 $8.7 $(430.5)$7,679.5 
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:
Electric Utility Operating Revenues
Year Ended December 31
(in millions)202020192018
Residential$1,743.9 $1,608.6 $1,636.3 
Small commercial and industrial1,325.9 1,384.6 1,408.6 
Large commercial and industrial821.5 871.9 912.2 
Other29.0 29.6 29.9 
Total retail revenues3,920.3 3,894.7 3,987.0 
Wholesale174.0 189.5 210.1 
Resale130.4 163.1 192.2 
Steam21.3 23.3 24.1 
Other utility revenues20.1 37.1 19.0 
Total electric utility operating revenues$4,266.1 $4,307.7 $4,432.4 
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
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 
Transport79.1 215.6 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 
Transport72.6 245.3 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 

(in millions)WisconsinIllinoisOther StatesTotal Natural Gas Utility Operating Revenues
Year ended December 31, 2018   
Residential$834.5 $877.5 $263.3 $1,975.3 
Commercial and industrial436.7 266.9 140.0 843.6 
Total retail revenues1,271.2 1,144.4 403.3 2,818.9 
Transport70.8 244.1 31.8 346.7 
Other utility revenues (1)
8.6 18.4 (6.7)20.3 
Total natural gas utility operating revenues$1,350.6 $1,406.9 $428.4 $3,185.9 
(1)    Includes amounts collected from (refunded to) customers for purchased gas adjustment costs.
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:
Year Ended December 31
(in millions)202020192018
Wind generation revenues$34.6 $24.0 $3.6 
We Power revenues22.9 25.4 25.3 
Appliance service revenues17.1 16.6 15.9 
Distributed renewable solar project revenues1.4 4.0 8.0 
Other0.3 0.2 0.2 
Total other non-utility operating revenues$76.3 $70.2 $53.0 
Other operating revenues  
Disaggregation of Operating Revenues  
Operating revenues disaggregated by revenue source
Other operating revenues consist primarily of the following:
Year Ended December 31
(in millions)202020192018
Alternative revenues (1)
$38.8 $(9.6)$(45.6)
Late payment charges (2)
29.4 43.7 40.3 
Other4.2 39.7 4.5 
Total other operating revenues$72.4 $73.8 $(0.8)

(1)    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.

(2)    The reduction in late payment charges is a result of various regulatory orders from our utility commissions in response to the COVID-19 pandemic, which include 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.