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Related Parties
 12 Months Ended
Dec. 31, 2023
Related Party Transactions [Abstract]  
RELATED PARTIES RELATED PARTIES
We routinely enter into transactions with related parties, including WEC Energy Group, its other subsidiaries, ATC, and other affiliated entities.

We provide and receive services, property, and other items of value to and from our parent, WEC Energy Group, and other subsidiaries of WEC Energy Group pursuant to an AIA that became effective in 2017. The AIA was approved by the appropriate regulators, including the PSCW. In accordance with the AIA, WBS provides several categories of services to us (including financial, human resource, and administrative services). As required by FERC regulations for centralized service companies, WBS renders services at cost. Services provided by any regulated subsidiary of WEC Energy Group to another regulated subsidiary or WBS are provided at cost, and any services provided by a regulated subsidiary to a nonregulated subsidiary of WEC Energy Group are provided at the greater of cost or fair market value.

We pay ATC for transmission and other related services it provides. In addition, we provide a variety of operational, maintenance, and project management work for ATC, which is reimbursed by ATC. Services are billed to and from ATC under agreements approved by the PSCW, at each of our fully allocated costs. We are also required to initially fund the construction of transmission infrastructure upgrades needed for new generation projects. ATC owns these transmission assets and reimburses us for these costs when the new generation is placed in service.

Our balance sheets included the following receivables and payables for services provided to or received from ATC:
(in millions)December 31, 2023December 31, 2022
Accounts receivable
Services provided to ATC$0.9 $0.7 
Amounts due from ATC for transmission infrastructure upgrades (1)
39.5 23.3 
Accounts payable
Services received from ATC36.7 20.0 

(1)     The transmission infrastructure upgrades were primarily related to the construction of our renewable energy projects.
The following table shows activity associated with our related party transactions for the years ended December 31:
(in millions)202320222021
Transactions with WPS
Natural gas related purchases from WPS (1)
$1.3 $3.3 $2.9 
Charges to WPS for services and other items (2)
16.2 13.3 11.8 
Charges from WPS for services and other items (2)
11.3 10.7 9.4 
Transactions with WG
Natural gas related purchases from WG (1)
19.7 6.2 5.9 
Natural gas related sales to WG (1)
0.3 1.3 0.3 
Charges to WG for services and other items (2)
38.3 39.5 40.4 
Charges from WG for services and other items (2)
27.9 29.8 29.7 
Transactions with UMERC
Charges to UMERC for services and other items (2)
11.8 13.7 10.5 
Charges from UMERC for services and other items (2)
2.0 1.2 1.2 
Transactions with Bluewater
Charges from Bluewater for storage service fees (3)
17.2 14.8 13.6 
Charges from Bluewater for other operating fees (3)
4.1 3.3 1.4 
Natural gas related sales to Bluewater (1)
2.8 2.7 2.6 
Charges to Bluewater for services and other items (2)
2.7 2.7 3.0 
Transactions with We Power
Lease payments and other lease-related charges from We Power (4)
422.0 412.6 406.0 
Charges to We Power for services and other items (2)
7.8 4.2 6.7 
Transactions with WBS
Charges to WBS for services and other items (2)
41.1 49.5 67.8 
(5)
Charges from WBS for services and other items (2)
113.3 123.1 123.8 
Transactions with ATC
Charges to ATC for services and construction8.1 9.3 14.9 
Charges from ATC for network transmission services248.8 239.3 240.4 
Net refund (payment) from (to) ATC related to FERC ROE orders— (0.1)5.1 

(1)    Includes amounts related to the purchase or sale of natural gas and/or pipeline capacity.

(2)    Includes amounts charged for services, pass through costs, asset and liability transfers, and other items in accordance with the approved AIA.

(3)    We have a long-term service agreement with a wholly owned subsidiary of Bluewater that was previously approved by the PSCW. Bluewater owns natural gas storage facilities in Michigan and provides a portion of our current storage needs.

(4)    We make lease payments to We Power for PWGS Units 1 and 2 and ERGS Units 1 and 2. See Note 15, Leases, for more information.

(5)     Includes $11.3 million for the transfer of certain software assets to WBS.