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Property, Plant, and Equipment - Balances (Details) $ in Millions | Dec. 31, 2023 USD ($) | Sep. 30, 2023 MW | Jun. 30, 2023 MW | Dec. 31, 2022 USD ($)
--- | --- | --- | --- | ---
Property, plant, and equipment |  |  |  |
Accumulated depreciation | $ 11,073.1 |  |  | $ 10,383.8
Net property, plant, and equipment | 31,581.5 |  |  | 29,113.8
WE | West Riverside Energy Center |  |  |  |
Property, plant, and equipment |  |  |  |
Capacity of generation unit | MW |  | 100 | 100 |
OCPP Units 5-8 | WE |  |  |  |
Property, plant, and equipment |  |  |  |
Net book value of plant to be retired | 783.7 |  |  |
Columbia Energy Center Units 1 and 2 | WPS |  |  |  |
Property, plant, and equipment |  |  |  |
Net book value of plant to be retired | 259.8 |  |  |
Regulated operations |  |  |  |
Property, plant, and equipment |  |  |  |
Accumulated depreciation | 8,907.9 |  |  | 8,416.2
Net | 24,215.3 |  |  | 22,889.2
CWIP | 1,118.3 |  |  | 972.1
Net property, plant, and equipment | 25,333.6 |  |  | 23,861.3
Regulated operations | Electric - generation |  |  |  |
Property, plant, and equipment |  |  |  |
Property, plant, and equipment | 6,190.4 |  |  | 5,480.5
Regulated operations | Electric - distribution |  |  |  |
Property, plant, and equipment |  |  |  |
Property, plant, and equipment | 8,688.0 |  |  | 8,233.3
Regulated operations | Natural gas - distribution, storage, and transmission |  |  |  |
Property, plant, and equipment |  |  |  |
Property, plant, and equipment | 14,851.3 |  |  | 14,203.3
Regulated operations | Property, plant, and equipment to be retired, net |  |  |  |
Property, plant, and equipment |  |  |  |
Property, plant, and equipment to be retired, net | 1,043.5 |  |  | 1,085.6
Regulated operations | Other |  |  |  |
Property, plant, and equipment |  |  |  |
Property, plant, and equipment | 2,350.0 |  |  | 2,302.7
Non-regulated operations |  |  |  |
Property, plant, and equipment |  |  |  |
Accumulated depreciation | 1,227.5 |  |  | 1,082.3
Net | 6,211.8 |  |  | 5,170.9
CWIP | 36.1 |  |  | 81.6
Net property, plant, and equipment | 6,247.9 |  |  | 5,252.5
Non-regulated operations | Other |  |  |  |
Property, plant, and equipment |  |  |  |
Property, plant, and equipment | 14.3 |  |  | 23.8
Non-regulated operations | We Power generation |  |  |  |
Property, plant, and equipment |  |  |  |
Property, plant, and equipment | 3,295.9 |  |  | 3,237.1
Non-regulated operations | Renewable generation |  |  |  |
Property, plant, and equipment |  |  |  |
Property, plant, and equipment | 3,667.7 |  |  | 2,537.1
Non-regulated operations | Natural gas storage |  |  |  |
Property, plant, and equipment |  |  |  |
Property, plant, and equipment | 291.6 |  |  | 292.2
Non-regulated operations | Corporate services |  |  |  |
Property, plant, and equipment |  |  |  |
Property, plant, and equipment | 169.8 |  |  | 163.0
Non-Utility Energy Infrastructure | Non-regulated operations |  |  |  |
Property, plant, and equipment |  |  |  |
Property, plant, and equipment | $ 7,255.2 |  |  | $ 6,066.4

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