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Property, Plant And Equipment: | 12 Months Ended
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Dec. 31, 2021
Property, Plant and Equipment [Abstract] |
Property, Plant and Equipment | 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 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://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 958 -SubTopic 360 -Section 50 -Paragraph 6 -URI http://asc.fasb.org/extlink&oid=120429125&loc=d3e99893-112916 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 360 -URI http://asc.fasb.org/topic&trid=2155823 Reference 3: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 958 -SubTopic 360 -Section 50 -Paragraph 7 -URI http://asc.fasb.org/extlink&oid=120429125&loc=SL120174063-112916 Reference 4: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 958 -SubTopic 360 -Section 50 -Paragraph 1 -Subparagraph (d) -URI http://asc.fasb.org/extlink&oid=120429125&loc=d3e99779-112916 + Details
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