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Property, Plant, and Equipment - Balances (Details) $ in Millions | Dec. 31, 2024 USD ($) | May 31, 2024 MW | Dec. 31, 2023 USD ($) | Jun. 30, 2023 MW
--- | --- | --- | --- | ---
Property, plant, and equipment |  |  |  |
Accumulated depreciation | $ 11,611.9 |  | $ 11,073.1 |
Net property, plant, and equipment | 34,645.4 |  | 31,581.5 |
WE | West Riverside Energy Center |  |  |  |
Property, plant, and equipment |  |  |  |
Capacity of generation unit | MW |  | 100 |  | 100
OCPP Units 7 and 8 | WE |  |  |  |
Property, plant, and equipment |  |  |  |
Net book value of plant to be retired | 657.4 |  |  |
Columbia Units 1 and 2 | WPS |  |  |  |
Property, plant, and equipment |  |  |  |
Net book value of plant to be retired | 248.9 |  |  |
Regulated operations |  |  |  |
Property, plant, and equipment |  |  |  |
Accumulated depreciation | 9,411.0 |  | 8,907.9 |
Net | 25,854.3 |  | 24,215.3 |
CWIP | 1,653.6 |  | 1,118.3 |
Net property, plant, and equipment | 27,507.9 |  | 25,333.6 |
Regulated operations | Electric - generation |  |  |  |
Property, plant, and equipment |  |  |  |
Property, plant, and equipment | 6,976.3 |  | 6,190.4 |
Regulated operations | Electric - distribution |  |  |  |
Property, plant, and equipment |  |  |  |
Property, plant, and equipment | 9,298.9 |  | 8,688.0 |
Regulated operations | Natural gas - distribution, storage, and transmission |  |  |  |
Property, plant, and equipment |  |  |  |
Property, plant, and equipment | 15,673.0 |  | 14,851.3 |
Regulated operations | Property, plant, and equipment to be retired, net |  |  |  |
Property, plant, and equipment |  |  |  |
Property, plant, and equipment to be retired, net | 906.3 |  | 1,043.5 |
Regulated operations | Other |  |  |  |
Property, plant, and equipment |  |  |  |
Property, plant, and equipment | 2,410.8 |  | 2,350.0 |
Non-regulated operations |  |  |  |
Property, plant, and equipment |  |  |  |
Accumulated depreciation | 1,393.9 |  | 1,227.5 |
Net | 7,096.2 |  | 6,211.8 |
CWIP | 41.3 |  | 36.1 |
Net property, plant, and equipment | 7,137.5 |  | 6,247.9 |
Non-regulated operations | Other |  |  |  |
Property, plant, and equipment |  |  |  |
Property, plant, and equipment | 14.1 |  | 14.3 |
Non-regulated operations | We Power generation |  |  |  |
Property, plant, and equipment |  |  |  |
Property, plant, and equipment | 3,284.3 |  | 3,295.9 |
Non-regulated operations | Renewable generation |  |  |  |
Property, plant, and equipment |  |  |  |
Property, plant, and equipment | 4,720.8 |  | 3,667.7 |
Non-regulated operations | Natural gas storage |  |  |  |
Property, plant, and equipment |  |  |  |
Property, plant, and equipment | 298.6 |  | 291.6 |
Non-regulated operations | Corporate services |  |  |  |
Property, plant, and equipment |  |  |  |
Property, plant, and equipment | 172.3 |  | 169.8 |
Non-Utility Energy Infrastructure | Non-regulated operations |  |  |  |
Property, plant, and equipment |  |  |  |
Property, plant, and equipment | $ 8,303.7 |  | $ 7,255.2 |

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