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INVESTMENT IN TRANSMISSION AFFILIATES (Tables) - Transmission Affiliates
 3 Months Ended
Mar. 31, 2023
Investment in transmission affiliates  
Schedule of changes to our investments in transmission affiliates The following tables provide a reconciliation of the changes in our investments in ATC and ATC Holdco:
Three Months Ended March 31, 2023
(in millions)ATCATC HoldcoTotal
Balance at beginning of period$1,884.6 $24.6 $1,909.2 
Add: Earnings from equity method investment42.9 0.9 43.8 
Add: Capital contributions6.1 — 6.1 
Less: Distributions37.4 — 37.4 
Balance at end of period$1,896.2 $25.5 $1,921.7 
Three Months Ended March 31, 2022
(in millions)ATCATC HoldcoTotal
Balance at beginning of period$1,766.9 $22.5 $1,789.4 
Add: Earnings from equity method investment41.0 0.7 41.7 
Add: Capital contributions21.1 — 21.1 
Less: Distributions34.0 — 34.0 
Balance at end of period$1,795.0 $23.2 $1,818.2 
Schedule of significant related party transactions with ATC
The following table summarizes our significant related party transactions with ATC:
Three Months Ended March 31
(in millions)20232022
Charges to ATC for services and construction$3.8 $6.2 
Charges from ATC for network transmission services94.5 91.1 
Schedule of receivables and payables with ATC
Our balance sheets included the following receivables and payables for services provided to or received from ATC:
(in millions)March 31, 2023December 31, 2022
Accounts receivable for services provided to ATC$1.5 $1.2 
Accounts payable for services received from ATC31.5 30.4 
Amounts due from ATC for transmission infrastructure upgrades (1)
29.3 26.6 

(1)These transmission infrastructure upgrades were primarily related to the construction of WE's and WPS's renewable energy projects.
Schedule of summarized income statement data for ATC
Summarized financial data for ATC is included in the tables below:
Three Months Ended March 31
(in millions)20232022
Income statement data
Operating revenues$200.4 $191.0 
Operating expenses99.1 95.5 
Other expense, net32.5 28.0 
Net income$68.8 $67.5 
Schedule of summarized balance sheet data for ATC
(in millions)March 31, 2023December 31, 2022
Balance sheet data
Current assets$100.2 $89.6 
Noncurrent assets6,070.8 5,997.8 
Total assets$6,171.0 $6,087.4 
Current liabilities$459.7 $511.9 
Long-term debt2,712.5 2,613.0 
Other noncurrent liabilities502.5 485.8 
Members' equity2,496.3 2,476.7 
Total liabilities and members' equity$6,171.0 $6,087.4