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Property, Plant And Equipment | 12 Months Ended
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Dec. 31, 2020
Property Plant And Equipment [Abstract] |
Property, Plant and Equipment | NOTE 9. PROPERTY, PLANT AND EQUIPMENT Net Utility Property Net utility property consisted of the following as of December 31 (dollars in thousands):
|  | 2020 |  |  | 2019 |
Utility plant in service |  | $ | 6,809,797 |  |  | $ | 6,462,993 |
Construction work in progress |  |  | 175,767 |  |  |  | 164,941 |
Total |  |  | 6,985,564 |  |  |  | 6,627,934 |
Less: Accumulated depreciation and amortization |  |  | 1,993,952 |  |  |  | 1,830,927 |
Total net utility property |  | $ | 4,991,612 |  |  | $ | 4,797,007 |
Gross Property, Plant and Equipment The gross balances of the major classifications of property, plant and equipment are detailed in the following table as of December 31 (dollars in thousands):
|  | 2020 |  |  | 2019 |
Avista Utilities: |  |  |  |  |  |  |  |
Electric production |  | $ | 1,457,497 |  |  | $ | 1,445,017 |
Electric transmission |  |  | 862,987 |  |  |  | 802,546 |
Electric distribution |  |  | 1,978,868 |  |  |  | 1,847,273 |
Electric construction work-in-progress (CWIP) and other |  |  | 384,372 |  |  |  | 350,331 |
Electric total |  |  | 4,683,724 |  |  |  | 4,445,167 |
Natural gas underground storage |  |  | 53,351 |  |  |  | 51,017 |
Natural gas distribution |  |  | 1,282,563 |  |  |  | 1,203,186 |
Natural gas CWIP and other |  |  | 83,644 |  |  |  | 81,245 |
Natural gas total |  |  | 1,419,558 |  |  |  | 1,335,448 |
Common plant (including CWIP) |  |  | 712,609 |  |  |  | 681,711 |
Total Avista Utilities |  |  | 6,815,891 |  |  |  | 6,462,326 |
AEL&P: |  |  |  |  |  |  |  |
Electric production |  |  | 105,076 |  |  |  | 100,448 |
Electric transmission |  |  | 22,419 |  |  |  | 22,000 |
Electric distribution |  |  | 25,814 |  |  |  | 24,096 |
Electric CWIP and other |  |  | 6,677 |  |  |  | 9,539 |
Electric total |  |  | 159,986 |  |  |  | 156,083 |
Common plant |  |  | 9,687 |  |  |  | 9,525 |
Total AEL&P |  |  | 169,673 |  |  |  | 165,608 |
Total gross utility property |  |  | 6,985,564 |  |  |  | 6,627,934 |
Other (1) |  |  | 16,394 |  |  |  | 28,195 |
Total |  | $ | 7,001,958 |  |  | $ | 6,656,129 |
(1) | Included in other property and investments-net and other non-current assets on the Consolidated Balance Sheets. Accumulated depreciation was $2.2 million as of December 31, 2020 and $5.4 million as of December 31, 2019 for the other businesses.

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