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OPERATING REVENUES (Tables) - Utility segment
 6 Months Ended
Jun. 30, 2020
Disaggregation of Operating Revenues  
Operating revenues disaggregated by revenue source
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.
Wisconsin Public Service Corporation
Three Months Ended June 30Six Months Ended June 30
(in millions)2020201920202019
Electric utility$265.0  $264.6  $536.3  $541.6  
Natural gas utility49.3  56.4  146.2  174.0  
Total revenues from contracts with customers314.3  321.0  682.5  715.6  
Other operating revenues(1.5) (0.1) (0.3) 1.1  
Total operating revenues$312.8  $320.9  $682.2  $716.7  
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
Three Months Ended June 30Six Months Ended June 30
(in millions)2020201920202019
Residential$98.4  $82.7  $199.5  $177.7  
Small commercial and industrial80.7  85.3  164.0  169.4  
Large commercial and industrial51.1  57.7  102.3  109.2  
Other2.1  2.1  4.2  4.2  
Total retail revenues232.3  227.8  470.0  460.5  
Wholesale23.1  24.2  45.5  53.6  
Resale5.3  6.9  10.6  16.4  
Other utility revenues4.3  5.7  10.2  11.1  
Total electric utility operating revenues$265.0  $264.6  $536.3  $541.6  
Revenues from contracts with customers | Natural gas  
Disaggregation of Operating Revenues  
Operating revenues disaggregated by revenue source
The following table disaggregates natural gas utility operating revenues into customer class:
Natural Gas Utility Operating Revenues
Three Months Ended June 30Six Months Ended June 30
(in millions)2020201920202019
Residential$29.0  $30.7  $87.4  $104.4  
Commercial and industrial13.0  16.0  46.1  62.3  
Total retail revenues42.0  46.7  133.5  166.7  
Transport4.2  3.9  10.2  9.2  
Other utility revenues (1)
3.1  5.8  2.5  (1.9) 
Total natural gas utility operating revenues$49.3  $56.4  $146.2  $174.0  

(1)Includes amounts collected from (refunded to) customers for purchased gas adjustment costs.
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)2020201920202019
Alternative revenues (1)
$(1.6) $(1.0) $(1.4) $(0.8) 
Late payment charges (2)
—  0.8  1.0  1.8  
Other0.1  0.1  0.1  0.1  
Total other operating revenues$(1.5) $(0.1) $(0.3) $1.1  

(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 wholesale customers subject to true-up, as discussed in Note 1(d), Operating Revenues, in our 2019 Annual Report on Form 10-K.

(2)The reduction in late payment charges is a result of a regulatory order from the PSCW in response to the COVID-19 pandemic, which includes the suspension of late payment charges during a designated time period. See Note 17, Regulatory Environment, for more information.