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Property, Plant And Equipment | 12 Months Ended
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Dec. 31, 2023
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) | 2023 |  | 2022
Property, Plant and Equipment |  |  |
Gas Distribution Utility | $ | 18,154.5 |  |  | $ | 16,576.4 |
Electric Utility | 7,907.9 |  |  | 7,162.4 |
Corporate | 274.2 |  |  | 271.7 |
Construction Work in Process | 1,261.1 |  |  | 1,398.2 |
Renewable Generation Assets(1) | 1,434.4 |  |  | 702.2 |
Non-Utility and Other | 1,450.0 |  |  | 1,440.4 |
Total Property, Plant and Equipment | $ | 30,482.1 |  |  | $ | 27,551.3 |
Accumulated Depreciation and Amortization |  |  |
Gas Distribution Utility | $ | (3,924.4) |  |  | $ | (3,678.1) |
Electric Utility | (2,709.5) |  |  | (2,557.4) |
Corporate | (174.2) |  |  | (160.0) |
Renewable Generation Assets(1) | (64.5) |  |  | (29.7) |
Non-Utility and Other | (1,334.6) |  |  | (1,283.5) |
Total Accumulated Depreciation and Amortization | $ | (8,207.2) |  |  | $ | (7,708.7) |
Net Property, Plant and Equipment | $ | 22,274.9 |  |  | $ | 19,842.6 |
(1)Our renewable generation assets are part of our electric segment and represent Non-Utility Property, owned and operated by JVs between NIPSCO and unrelated tax equity partners, and depreciated straight-line over 30 years. Refer to Note 4, "Noncontrolling Interest," for additional information. The weighted average depreciation provisions for utility plant, as a percentage of the original cost, for the periods ended December 31, 2023, 2022 and 2021 were as follows:
| 2023 |  | 2022 |  | 2021
Electric Operations | 3.5 | % |  | 3.1 | % |  | 3.4 | %
Gas Distribution Operations | 2.4 | % |  | 2.3 | % |  | 2.2 | %
We recognized depreciation expense of $756.9 million, $685.0 million and $672.1 million for the years ended 2023, 2022 and 2021, respectively. The 2023, 2022 and 2021, depreciation expense includes $12.5 million, $11.0 million, and $5.3 million related to the regulatory deferral of income associated with our JVs, which is not included in current rates. 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 $77.5 million, $53.1 million and $49.4 million in 2023, 2022 and 2021, respectively, related to software recorded as intangible assets. Our unamortized software balance was $205.6 million and $190.1 million at December 31, 2023 and 2022, respectively. Amortization of Cloud Computing Costs. We amortized $12.6 million, $11.1 million and $10.0 million in 2023, 2022 and 2021, respectively, related to cloud computing costs to "Operation and maintenance" expense. Our unamortized cloud computing balance was $32.2 million and $45.7 million at December 31, 2023 and 2022, respectively.

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