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Property, Plant and Equipment (Tables) | 12 Months Ended
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Dec. 31, 2021
Property, Plant and Equipment [Abstract] |
Property, Plant and Equipment | Property, plant and equipment at December 31 consisted of the following (dollars in thousands):
| 2021 | 2020 | 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 | $ | 1,452,055 |  | 41 | $ | 1,417,951 |  | 40 | 32 | 45
Electric transmission | 546,126 |  | 49 | 517,794 |  | 49 | 43 | 50
Electric distribution | 1,000,619 |  | 47 | 959,453 |  | 46 | 45 | 49
Integrated Generation | 720,490 |  | 30 | 716,479 |  | 31 | 2 | 59
Plant acquisition adjustment (a) | 4,870 |  | 32 | 4,870 |  | 32 | 32 | 32
General | 266,935 |  | 28 | 259,010 |  | 28 | 25 | 31
Total electric plant in service | 3,991,095 |  |  | 3,875,557 |  |  |  |
Construction work in progress | 181,451 |  |  | 95,266 |  |  |  |
Total electric plant | 4,172,546 |  |  | 3,970,823 |  |  |  |
Less accumulated depreciation and depletion | (1,016,738) |  |  | (960,993) |  |  |  |
Electric plant net of accumulated depreciation and depletion | $ | 3,155,808 |  |  | $ | 3,009,830 |  |  |  |
____________________ (a) The plant acquisition adjustment is included in rate base and is being recovered with 9 years remaining.
| 2021 | 2020 | 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 | $ | 14,841 |  | 40 | $ | 15,603 |  | 40 | 24 | 46
Gas transmission | 645,550 |  | 58 | 578,278 |  | 54 | 22 | 71
Gas distribution | 2,394,352 |  | 53 | 2,115,082 |  | 53 | 45 | 59
Cushion gas - depreciable (a) | 3,539 |  | 28 | 3,539 |  | 28 | 28 | 28
Cushion gas - not depreciable (a) | 42,478 |  | N/A | 39,184 |  | N/A | N/A | N/A
Storage | 56,289 |  | 38 | 55,481 |  | 38 | 27 | 52
General | 474,964 |  | 21 | 438,217 |  | 19 | 3 | 23
Total gas plant in service | 3,632,013 |  |  | 3,245,384 |  |  |  |
Construction work in progress | 37,860 |  |  | 67,229 |  |  |  |
Total gas plant | 3,669,873 |  |  | 3,312,613 |  |  |  |
Less accumulated depreciation | (389,115) |  |  | (323,679) |  |  |  |
Gas plant net of accumulated depreciation | $ | 3,280,758 |  |  | $ | 2,988,934 |  |  |  |
____________________ (a) Depreciation of Cushion Gas is determined by the respective regulatory jurisdiction in which the Cushion Gas resides.
2021 | Lives (in years)
| Property, Plant and Equipment | Construction Work in Progress | Total Property Plant and Equipment | Less Accumulated Depreciation | Net Property, Plant and Equipment | Weighted Average Useful Life | Minimum | Maximum
Corporate | $ | 5,694 |  | $ | 8,460 |  | $ | 14,154 |  | $ | (1,544) |  | $ | 12,610 |  | 10 | 10 | 22
2020 | Lives (in years)
| Property, Plant and Equipment | Construction Work in Progress | Total Property Plant and Equipment | Less Accumulated Depreciation | Net Property, Plant and Equipment | Weighted Average Useful Life | Minimum | Maximum
Corporate | $ | 5,692 |  | $ | 16,402 |  | $ | 22,094 |  | $ | (1,144) |  | $ | 20,950 |  | 10 | 10 | 22

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- Definition Tabular disclosure of physical assets used in the normal conduct of business and not intended for resale. Includes, but is not limited to, balances by class of assets, depreciation and depletion expense and method used, including composite depreciation, and accumulated deprecation. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02(13)) -URI http://asc.fasb.org/extlink&oid=120391452&loc=d3e13212-122682 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 360 -SubTopic 10 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6391035&loc=d3e2868-110229 + Details
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