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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 | (5) PROPERTY, PLANT AND EQUIPMENT Property, plant and equipment at December 31 consisted of the following (dollars in millions):
| 2023 | 2022 | Lives (in years)
Electric Utilities | Property, Plant and Equipment |  | Weighted Average Useful Life (in years) | Property, Plant and Equipment |  | Weighted Average Useful Life (in years) | Minimum | Maximum
Electric plant: |  |  |  |  |  |  |  |
Production | $ | 1,492.8 |  | 40 | $ | 1,482.1 |  | 41 | 32 | 45
Electric transmission |  | 737.4 |  | 48 |  | 632.9 |  | 48 | 42 | 51
Electric distribution |  | 1,146.9 |  | 47 |  | 1,082.5 |  | 47 | 45 | 50
Integrated Generation |  | 720.0 |  | 30 |  | 713.5 |  | 31 | 19 | 38
Plant acquisition adjustment (a) |  | 4.9 |  | 32 |  | 4.9 |  | 32 | 32 | 32
General |  | 291.7 |  | 27 |  | 274.8 |  | 27 | 24 | 28
Total electric plant in service |  | 4,393.7 |  |  |  | 4,190.7 |  |  |  |
Construction work in progress |  | 123.1 |  |  |  | 153.0 |  |  |  |
Total electric plant |  | 4,516.8 |  |  |  | 4,343.7 |  |  |  |
Less accumulated depreciation and depletion |  | (1,207.7 | ) |  |  | (1,104.1 | ) |  |  |
Electric plant net of accumulated depreciation and depletion | $ | 3,309.1 |  |  | $ | 3,239.6 |  |  |  |
____________________ (a) The plant acquisition adjustment, which relates to the acquisition of our ownership interest in Wyodak Plant, is included in rate base and is being recovered w ith 7 years rem aining.
| 2023 | 2022 | Lives (in years)
Gas Utilities | Property, Plant and Equipment |  | Weighted Average Useful Life (in years) | Property, Plant and Equipment |  | Weighted Average Useful Life (in years) | Minimum | Maximum
Gas plant: |  |  |  |  |  |  |  |
Production | $ | 21.0 |  | 45 | $ | 17.8 |  | 45 | 24 | 47
Gas transmission |  | 759.5 |  | 58 |  | 695.4 |  | 58 | 32 | 72
Gas distribution |  | 2,860.0 |  | 57 |  | 2,620.2 |  | 57 | 48 | 61
Cushion gas - not depreciable (a) |  | 58.2 |  | N/A |  | 63.1 |  | N/A | N/A | N/A
Storage |  | 71.4 |  | 42 |  | 65.8 |  | 41 | 36 | 49
General |  | 571.8 |  | 22 |  | 497.4 |  | 23 | 20 | 25
Total gas plant in service |  | 4,341.9 |  |  |  | 3,959.7 |  |  |  |
Construction work in progress |  | 39.2 |  |  |  | 52.0 |  |  |  |
Total gas plant |  | 4,381.1 |  |  |  | 4,011.7 |  |  |  |
Less accumulated depreciation |  | (588.3 | ) |  |  | (471.0 | ) |  |  |
Gas plant net of accumulated depreciation | $ | 3,792.8 |  |  | $ | 3,540.7 |  |  |  |
____________________ (a) Depreciation of Cushion Gas is determined by the respective regulatory jurisdiction in which the Cushion Gas resides. In 2022, assets classified as Cushion gas - depreciable were fully depreciated and removed from gross plant in service and accumulated depreciation.
| 2023 | 2022 | Lives (in years)
Corporate | Property, Plant and Equipment |  | Weighted Average Useful Life (in years) | Property, Plant and Equipment |  | Weighted Average Useful Life (in years) | Minimum | Maximum
Total plant in service | $ | 5.7 |  | 10 | $ | 5.7 |  | 11 | 4 | 23
Construction work in progress |  | 13.6 |  |  |  | 13.7 |  |  |  |
Total gross property, plant and equipment |  | 19.3 |  |  |  | 19.4 |  |  |  |
Less accumulated depreciation |  | (1.9 | ) |  |  | (1.8 | ) |  |  |
Total net of accumulated depreciation | $ | 17.4 |  |  | $ | 17.6 |  |  |  |

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- Definition The entire disclosure for long-lived, physical asset used in normal conduct of business and not intended for resale. Includes, but is not limited to, work of art, historical treasure, and similar asset classified as collections. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Topic 360 -Name Accounting Standards Codification -Publisher FASB -URI https://asc.fasb.org//360/tableOfContent Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Name Accounting Standards Codification -Section 50 -Paragraph 6 -SubTopic 360 -Topic 958 -Publisher FASB -URI https://asc.fasb.org//1943274/2147480321/958-360-50-6 Reference 3: http://www.xbrl.org/2003/role/disclosureRef -Name Accounting Standards Codification -Section 50 -Paragraph 1 -Subparagraph (d) -SubTopic 360 -Topic 958 -Publisher FASB -URI https://asc.fasb.org//1943274/2147480321/958-360-50-1 Reference 4: http://www.xbrl.org/2003/role/disclosureRef -Name Accounting Standards Codification -Section 50 -Paragraph 7 -SubTopic 360 -Topic 958 -Publisher FASB -URI https://asc.fasb.org//1943274/2147480321/958-360-50-7 + Details
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