XML 60 R48.htm IDEA: XBRL DOCUMENT
v3.26.1

DERIVATIVE INSTRUMENTS (Tables) | 6 Months Ended
--- | ---
Jun. 30, 2026
Derivative Instruments and Hedging Activities Disclosure [Abstract] |
Schedule of derivative assets and liabilities | The following table shows our derivative assets and derivative liabilities. None of the derivatives shown below were designated as hedging instruments.
|  | June 30, 2026 |  | December 31, 2025
(in millions) |  | Derivative Assets |  | Derivative Liabilities |  | Derivative Assets |  | Derivative Liabilities
Current |  |  |  |  |  |  |  |
Natural gas contracts |  | $ | 20.8 |  |  | $ | 38.8 |  |  | $ | 19.7 |  |  | $ | 30.0 |
FTRs |  | 24.3 |  |  | — |  |  | 6.5 |  |  | 0.8 |
Total current |  | 45.1 |  |  | 38.8 |  |  | 26.2 |  |  | 30.8 |
Long-term |  |  |  |  |  |  |  |
Natural gas contracts |  | — |  |  | 3.1 |  |  | 0.1 |  |  | 1.7 |
Total |  | $ | 45.1 |  |  | $ | 41.9 |  |  | $ | 26.3 |  |  | $ | 32.5 |
Schedule of estimated notional volumes and realized gains and losses | Our realized gains and losses and the estimated notional volumes related to these settlements were as follows:
|  | Three Months Ended June 30, 2026 |  | Three Months Ended June 30, 2025
(in millions) |  | Volumes |  | Gains (Losses) |  | Volumes |  | Gains
Natural gas contracts |  | 48.6 Dth |  | $ | (16.8) |  |  | 47.3 Dth |  | $ | 6.5 |
FTRs and TCRs |  |  |  |  |  |  |  |
Regulated utility operations |  | 6.1 MWh |  | 4.3 |  |  | 6.7 MWh |  | 3.0 |
Non-utility operations |  | — MWh |  | — |  |  | 0.3 MWh |  | 0.3 |
Total |  |  |  | $ | (12.5) |  |  |  |  | $ | 9.8 |
|  | Six Months Ended June 30, 2026 |  | Six Months Ended June 30, 2025
(in millions) |  | Volumes |  | Gains |  | Volumes |  | Gains
Natural gas contracts |  | 111.6 Dth |  | $ | 12.8 |  |  | 108.8 Dth |  | $ | 4.6 |
FTRs and TCRs |  |  |  |  |  |  |  |
Regulated utility operations |  | 11.9 MWh |  | 6.0 |  |  | 13.8 MWh |  | 4.7 |
Non-utility operations |  | 0.1 MWh |  | 0.1 |  |  | 0.6 MWh |  | 0.1 |
Total |  |  |  | $ | 18.9 |  |  |  |  | $ | 9.4 |
Schedule of net derivative instruments | The following table shows derivative assets and derivative liabilities if derivative instruments by counterparty were presented net on our balance sheets:
|  | June 30, 2026 |  | December 31, 2025 |
(in millions) |  | Derivative Assets |  | Derivative Liabilities |  | Derivative Assets |  | Derivative Liabilities |
Gross amount recognized on the balance sheet |  | $ | 45.1 |  |  | $ | 41.9 |  |  | $ | 26.3 |  |  | $ | 32.5 |  |
Gross amount not offset on the balance sheet |  | (3.7) |  |  | (37.3) |  | (1) | (2.0) |  |  | (23.8) |  | (2)
Net amount |  | $ | 41.4 |  |  | $ | 4.6 |  |  | $ | 24.3 |  |  | $ | 8.7 |  |
(1)Includes cash collateral posted of $33.6 million. (2)Includes cash collateral posted of $21.8 million.

X
- References No definition available. + Details
Name: | us-gaap_DerivativeInstrumentsAndHedgingActivitiesDisclosureAbstract
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

X
- Definition Tabular disclosure of the location and fair value amounts of derivative instruments (and nonderivative instruments that are designated and qualify as hedging instruments) reported in the statement of financial position. + References Reference 1: http://www.xbrl.org/2003/role/exampleRef -Topic 815 -SubTopic 10 -Name Accounting Standards Codification -Section 55 -Paragraph 182 -Publisher FASB -URI https://asc.fasb.org/1943274/2147480401/815-10-55-182 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Topic 815 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 4A -Subparagraph (a) -Publisher FASB -URI https://asc.fasb.org/1943274/2147480434/815-10-50-4A Reference 3: http://www.xbrl.org/2003/role/disclosureRef -Topic 815 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 4E -Publisher FASB -URI https://asc.fasb.org/1943274/2147480434/815-10-50-4E Reference 4: http://www.xbrl.org/2003/role/disclosureRef -Topic 815 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 4B -Publisher FASB -URI https://asc.fasb.org/1943274/2147480434/815-10-50-4B + Details
Name: | us-gaap_ScheduleOfDerivativeInstrumentsInStatementOfFinancialPositionFairValueTextBlock
Namespace Prefix: | us-gaap_
Data Type: | dtr-types:textBlockItemType
Balance Type: | na
Period Type: | duration

X
- Definition Tabular disclosure of the amount of the realized gain (loss) and notional volumes for derivative instruments not designated as hedging instruments. + References No definition available. + Details
Name: | wec_DerivativeInstrumentsRealizedGainLossandNotionalVolumesTableTextBlock
Namespace Prefix: | wec_
Data Type: | dtr-types:textBlockItemType
Balance Type: | na
Period Type: | duration

X
- Definition Tabular disclosure of derivative assets and liabilities if derivative instruments by counterparty were presented net on the balance sheets. + References No definition available. + Details
Name: | wec_NetDerivativeInstrumentsByCounterpartyTableTextBlock
Namespace Prefix: | wec_
Data Type: | dtr-types:textBlockItemType
Balance Type: | na
Period Type: | duration