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Property, Plant And Equipment | 12 Months Ended
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Dec. 31, 2024
Property, Plant and Equipment [Abstract] |
Property, Plant And Equipment | Our property, plant and equipment on the Consolidated Balance Sheets are classified as follows:
At December 31, (in millions) | 2024 |  | 2023
Property, Plant and Equipment |  |  |
Gas Distribution Utility | $ | 20,007.2 |  |  | $ | 18,154.5 |
Electric Utility | 8,666.8 |  |  | 7,907.9 |
Corporate | 248.1 |  |  | 274.2 |
Construction Work in Process | 2,084.7 |  |  | 1,261.1 |
JV Renewable Generation Assets(1) | 1,434.2 |  |  | 1,434.4 |
Non-Utility and Other | 1,711.9 |  |  | 1,450.0 |
Total Property, Plant and Equipment | $ | 34,152.9 |  |  | $ | 30,482.1 |
Accumulated Depreciation and Amortization |  |  |
Gas Distribution Utility | $ | (4,166.8) |  |  | $ | (3,924.4) |
Electric Utility | (2,707.8) |  |  | (2,709.5) |
Corporate | (163.4) |  |  | (174.2) |
JV Renewable Generation Assets(1) | (110.4) |  |  | (64.5) |
Non-Utility and Other | (1,550.6) |  |  | (1,334.6) |
Total Accumulated Depreciation and Amortization | $ | (8,699.0) |  |  | $ | (8,207.2) |
Net Property, Plant and Equipment | $ | 25,453.9 |  |  | $ | 22,274.9 |
(1)These JV renewable generation assets owned and operated by JVs between NIPSCO and unrelated tax equity partners represent Non-Utility Property, are depreciated straight-line over 30 years and are part of our NIPSCO Operations segment. Refer to Note 4, "Noncontrolling Interests," for additional information. The weighted average depreciation provisions for utility plant, as a percentage of the original cost, for the periods ended December 31, 2024, 2023 and 2022 were as follows:
| 2024 |  | 2023 |  | 2022
NIPSCO Operations | 3.0 | % |  | 3.0 | % |  | 2.7 | %
Columbia Operations | 2.6 | % |  | 2.5 | % |  | 2.4 | %
We recognized depreciation expense of $820.4 million, $756.9 million and $685.0 million for the years ended 2024, 2023 and 2022, respectively. The 2024, 2023 and 2022, depreciation expense includes $58.9 million, $12.5 million, and $11.0 million related to the regulatory deferral of income associated with our JVs. See Note 1, "Nature of Operations and Summary of Significant Accounting Policies - S. Noncontrolling Interest," for additional details. Amortization of on-premise Software Costs. We amortized $85.2 million, $77.5 million and $53.1 million in 2024, 2023 and 2022, respectively, related to software recorded as intangible assets. Our unamortized software balance was $236.1 million and $205.6 million at December 31, 2024 and 2023, respectively. Amortization of Cloud Computing Costs. We amortized $17.7 million, $12.6 million and $11.1 million in 2024, 2023 and 2022, respectively, related to cloud computing costs to "Operation and maintenance" expense. Our unamortized cloud computing balance was $77.5 million and $32.2 million at December 31, 2024 and 2023, respectively.

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