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Note 13 - Property, Plant and Equipment | 12 Months Ended
--- | ---
Dec. 31, 2019
Notes to Financial Statements |
Property, Plant and Equipment Disclosure [Text Block] | 13. Property, Plant and Equipment
(in thousands) |  | December 31, 2019 |  |  | December 31, 2018 |
Electric Plant in Service |  |  |  |  |  |  |  |
Production |  | $ | 915,996 |  |  | $ | 905,224 |
Transmission |  |  | 647,474 |  |  |  | 512,832 |
Distribution |  |  | 526,146 |  |  |  | 502,261 |
General |  |  | 123,268 |  |  |  | 99,404 |
Electric Plant in Service |  |  | 2,212,884 |  |  |  | 2,019,721 |
Construction Work in Progress |  |  | 177,584 |  |  |  | 170,090 |
Total Gross Electric Plant |  |  | 2,390,468 |  |  |  | 2,189,811 |
Less Accumulated Depreciation and Amortization |  |  | 731,110 |  |  |  | 699,642 |
Net Electric Plant |  | $ | 1,659,358 |  |  | $ | 1,490,169 |
Nonelectric Operations Plant |  |  |  |  |  |  |  |
Equipment |  | $ | 187,904 |  |  | $ | 170,634 |
Buildings and Leasehold Improvements |  |  | 53,412 |  |  |  | 53,011 |
Land |  |  | 6,040 |  |  |  | 4,475 |
Nonelectric Operations Plant |  |  | 247,356 |  |  |  | 228,120 |
Construction Work in Progress |  |  | 7,654 |  |  |  | 11,536 |
Total Gross Nonelectric Plant |  |  | 255,010 |  |  |  | 239,656 |
Less Accumulated Depreciation and Amortization |  |  | 160,574 |  |  |  | 148,727 |
Net Nonelectric Operations Plant |  | $ | 94,436 |  |  | $ | 90,929 |
Net Plant |  | $ | 1,753,794 |  |  | $ | 1,581,098 |
The estimated service lives for rate-regulated properties is 5 to 82 years. For nonelectric property the estimated useful lives are from 2 to 40 years.
|  | Service Life Range |
(years) |  | Low |  |  | High |
Electric Fixed Assets: |  |  |  |  |  |
Production Plant |  | 9 |  |  | 82 |
Transmission Plant |  | 51 |  |  | 75 |
Distribution Plant |  | 15 |  |  | 70 |
General Plant |  | 5 |  |  | 57 |
Nonelectric Fixed Assets: |  |  |  |  |  |
Equipment |  | 2 |  |  | 12 |
Buildings and Leasehold Improvements |  | 5 |  |  | 40 |

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- Definition The entire disclosure for long-lived, physical assets used in the normal conduct of business and not intended for resale. Includes, but is not limited to, accounting policies and methodology, roll forwards, depreciation, depletion and amortization expense, including composite depreciation, accumulated depreciation, depletion and amortization expense, useful lives and method used, income statement disclosures, assets held for sale and public utility disclosures. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 360 -URI http://asc.fasb.org/topic&trid=2155823 + Details
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