XML 62 R50.htm IDEA: XBRL DOCUMENT v3.25.1

INVESTMENT IN TRANSMISSION AFFILIATES (Tables) - Transmission Affiliates

3 Months Ended

Mar. 31, 2025

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, 2025
(in millions)						ATC						ATC Holdco						Total
Balance at beginning of period						$	2,085.1					$	23.8					$	2,108.9
Add: Earnings from equity method investment						50.0						3.6						53.6
Add: Capital contributions						42.3						—						42.3
Less: Distributions						55.8						—						55.8
Balance at end of period						$	2,121.6					$	27.4					$	2,149.0
						Three Months Ended March 31, 2024
(in millions)						ATC						ATC Holdco						Total
Balance at beginning of period						$	1,980.8					$	25.1					$	2,005.9
Add: Earnings from equity method investment						44.4						0.4						44.8
Add: Capital contributions						12.1						—						12.1
Less: Distributions						35.7						—						35.7
Balance at end of period						$	2,001.6					$	25.5					$	2,027.1

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)																		2025						2024
Charges to ATC for services and construction																		$	4.5					$	4.7
Charges from ATC for network transmission services																		116.7						103.3
Refund from ATC related to FERC ROE orders																		1.4						—

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, 2025						December 31, 2024
Accounts receivable for services provided to ATC						$	2.0					$	1.4
Accounts payable for services received from ATC						38.9						34.4
Amounts due from ATC for transmission infrastructure upgrades (1)						11.3						54.5

(1)These transmission infrastructure upgrades were primarily related to the construction of WE's, WPS's, and UMERC'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)																		2025						2024
Income statement data
Operating revenues																		$	234.9					$	211.9
Operating expenses																		116.7						104.8
Other expense, net																		39.1						35.2
Net income																		$	79.1					$	71.9

Schedule of summarized balance sheet data for ATC

(in millions)						March 31, 2025						December 31, 2024
Balance sheet data
Current assets						$	145.8					$	126.6
Noncurrent assets						6,946.6						6,792.6
Total assets						$	7,092.4					$	6,919.2
Current liabilities						$	639.1					$	482.4
Long-term debt						3,025.9						3,083.4
Other noncurrent liabilities						559.0						545.0
Members' equity						2,868.4						2,808.4
Total liabilities and members' equity						$	7,092.4					$	6,919.2

X

- Definition

Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Topic 235
-SubTopic 10
-Name Accounting Standards Codification
-Section S99
-Paragraph 1
-Subparagraph (SX 210.4-08(g)(1)(ii))
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147480678/235-10-S99-1

Reference 2: http://www.xbrl.org/2003/role/disclosureRef
-Topic 323
-SubTopic 10
-Name Accounting Standards Codification
-Section 50
-Paragraph 3
-Subparagraph (c)
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147481687/323-10-50-3

Reference 3: http://www.xbrl.org/2003/role/disclosureRef
-Topic 825
-SubTopic 10
-Name Accounting Standards Codification
-Section 50
-Paragraph 28
-Subparagraph (f)
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147482907/825-10-50-28

Reference 4: http://www.xbrl.org/2003/role/disclosureRef
-Topic 323
-SubTopic 10
-Name Accounting Standards Codification
-Section 50
-Paragraph 3
-Subparagraph (a)(1)
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147481687/323-10-50-3

Reference 5: http://www.xbrl.org/2003/role/disclosureRef
-Topic 323
-SubTopic 10
-Name Accounting Standards Codification
-Section 50
-Paragraph 3
-Subparagraph (a)(2)
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147481687/323-10-50-3

Reference 6: http://www.xbrl.org/2003/role/disclosureRef
-Topic 323
-SubTopic 10
-Name Accounting Standards Codification
-Section 50
-Paragraph 3
-Subparagraph (b)
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147481687/323-10-50-3

+ Details

Name:	us-gaap_ScheduleOfEquityMethodInvestmentsLineItems
Namespace Prefix:	us-gaap_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration

X

- Definition

Tabular disclosure of related party transactions. Examples of related party transactions include, but are not limited to, transactions between (a) a parent company and its subsidiary; (b) subsidiaries of a common parent; (c) and entity and its principal owners and (d) affiliates.

+ References

No definition available.

+ Details

Name:	us-gaap_ScheduleOfRelatedPartyTransactionsTableTextBlock
Namespace Prefix:	us-gaap_
Data Type:	dtr-types:textBlockItemType
Balance Type:	na
Period Type:	duration

X

- Definition

Tabular reconciliation of beginning and ending balances of investments accounted for under the equity method of accounting.

+ References

No definition available.

+ Details

Name:	wec_ScheduleOfChangesToEquityMethodInvestmentsTableTextBlock
Namespace Prefix:	wec_
Data Type:	dtr-types1:textBlockItemType
Balance Type:	na
Period Type:	duration

X

- Definition

Tabular disclosure of summarized balance sheet data related to significant equity method investments.

+ References

No definition available.

+ Details

Name:	wec_ScheduleOfEquityMethodInvestmentsSummarizedBalanceSheetDataTableTextBlock
Namespace Prefix:	wec_
Data Type:	dtr-types1:textBlockItemType
Balance Type:	na
Period Type:	duration

X

- Definition

Tabular disclosure of summarized income statement data related to significant equity method investments.

+ References

No definition available.

+ Details

Name:	wec_ScheduleOfEquityMethodInvestmentsSummarizedIncomeStatementDataTableTextBlock
Namespace Prefix:	wec_
Data Type:	dtr-types1:textBlockItemType
Balance Type:	na
Period Type:	duration

X

- Definition

Tabular disclosure of balance sheet information related to transactions entered into with related parties.

+ References

No definition available.

+ Details

Name:	wec_ScheduleOfRelatedPartyTransactionsBalanceSheetInformationTableTextBlock
Namespace Prefix:	wec_
Data Type:	dtr-types1:textBlockItemType
Balance Type:	na
Period Type:	duration

X

- Details

Name:	srt_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis=wec_TransmissionAffiliatesMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type: