REGULATORY ENVIRONMENT - PGL AND NSG 2023 RATE ORDER (Details) - Illinois Commerce Commission (ICC) - 2023 Rate Order - USD ($) $ in Millions |
3 Months Ended | ||
|---|---|---|---|
May 30, 2024 |
Nov. 16, 2023 |
Dec. 31, 2023 |
|
| Public Utilities, General Disclosures [Line Items] | |||
| Impairment of property, plant, and equipment | $ 178.9 | ||
| PGL | |||
| Public Utilities, General Disclosures [Line Items] | |||
| Approved rate increase | $ 1.6 | $ 304.6 | |
| Approved rate increase (as a percent) | 43.50% | ||
| Approved return on equity (as a percent) | 9.38% | ||
| Approved common equity component average (as a percent) | 50.79% | ||
| Disallowed capital costs | $ 236.2 | ||
| Additional capital spend approved | $ 28.5 | ||
| Impairment of property, plant, and equipment | 177.2 | ||
| NSG | |||
| Public Utilities, General Disclosures [Line Items] | |||
| Approved rate increase | $ 11.0 | ||
| Approved rate increase (as a percent) | 11.60% | ||
| Approved return on equity (as a percent) | 9.38% | ||
| Approved common equity component average (as a percent) | 52.58% | ||
| Disallowed capital costs | $ 1.7 | ||
| Impairment of property, plant, and equipment | $ 1.7 |