RATE MATTERS - FERC Annual Revenue Requirements (Details) - USD ($) $ in Millions |
6 Months Ended | 12 Months Ended | 54 Months Ended | |||
|---|---|---|---|---|---|---|
Jun. 30, 2025 |
Dec. 31, 2024 |
Dec. 31, 2023 |
Dec. 31, 2022 |
Dec. 31, 2021 |
Jun. 30, 2025 |
|
| FERC 2021 PJM and SPP Transmission Formula Rate Challenge | ||||||
| Public Utilities, General Disclosures [Line Items] | ||||||
| Stand alone treatment of nolcs annual revenue increase | $ 48.7 | $ 52.1 | $ 60.7 | $ 68.5 | $ 78.3 | $ 308.3 |