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REGULATORY ENVIRONMENT - PGL AND NSG UEA RIDER (Details) - Illinois Commerce Commission (ICC) $ in Millions | 1 Months Ended |
--- | --- | ---
May 31, 2023 USD ($) | Sep. 30, 2025 USD ($) Assurance
Uncollectible Expense Adjustment Rider Open Reconciliations 2019-2024 |  |
Public Utilities, General Disclosures [Line Items] |  |
Amount of assurance that UEA rider costs will be recoverable | Assurance |  | 0
Minimum annual costs included in UEA rider during open reconciliation years |  | $ 10.0
Maximum annual costs included in UEA rider during open reconciliation years |  | $ 40.0
PGL | 2018 Annual Uncollectible Expense Adjustment Rider Reconciliation |  |
Public Utilities, General Disclosures [Line Items] |  |
Refunds required to customers | $ 15.4 |
Refund period | 9 months |
NSG | 2018 Annual Uncollectible Expense Adjustment Rider Reconciliation |  |
Public Utilities, General Disclosures [Line Items] |  |
Refunds required to customers | $ 0.7 |
Refund period | 9 months |

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