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Property Plant and Equipment Property Plant and Equipment | 12 Months Ended
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Dec. 31, 2018
Property, Plant and Equipment [Abstract] |
Property, Plant and Equipment Disclosure | Property, Plant and Equipment Major classes of property, plant and equipment:
(Millions of Dollars) |  | Dec. 31, 2018 |  | Dec. 31, 2017
Property, plant and equipment |  |  |  |
Electric plant |  | $ | 41,472 |  |  | $ | 39,016 |
Natural gas plant |  | 6,210 |  |  | 5,800 |
Common and other property |  | 2,154 |  |  | 2,013 |
Plant to be retired (a) |  | 322 |  |  | 11 |
CWIP |  | 2,091 |  |  | 2,087 |
Total property, plant and equipment |  | 52,249 |  |  | 48,927 |
Less accumulated depreciation |  | (15,659 | ) |  | (15,000 | )
Nuclear fuel |  | 2,771 |  |  | 2,697 |
Less accumulated amortization |  | (2,417 | ) |  | (2,295 | )
|  | $ | 36,944 |  |  | $ | 34,329 |
(a) | In 2018, the CPUC approved early retirement of PSCo’s Comanche Units 1 and 2 in approximately 2022 and 2025, respectively. PSCo also expects Craig Unit 1 to be retired early in 2025. Amounts are presented net of accumulated depreciation.
Joint Ownership of Generation, Transmission and Gas Facilities The utility subsidiaries’ jointly owned assets as of Dec. 31, 2018:
(Millions of Dollars) |  | Plant in Service |  | Accumulated Depreciation |  | CWIP |  | Percent Owned
NSP-Minnesota |  |  |  |  |  |  |  |
Electric Generation: |  |  |  |  |  |  |  |
Sherco Unit 3 |  | $ | 604 |  |  | $ | 415 |  |  | $ | 1 |  |  | 59 | %
Sherco Common Facilities |  | 145 |  |  | 100 |  |  | 1 |  |  | 80 |
Other |  | 5 |  |  | 4 |  |  | — |  |  | 59 |
Electric Transmission: |  |  |  |  |  |  |  |
CapX2020 Transmission |  | 960 |  |  | 73 |  |  | 2 |  |  | 51 |
Other |  | 11 |  |  | 2 |  |  | — |  |  | 50 |
Total NSP-Minnesota |  | $ | 1,725 |  |  | $ | 594 |  |  | $ | 4 |  |  |
(Millions of Dollars) |  | Plant in Service |  | Accumulated Depreciation |  | CWIP |  | Percent Owned
NSP-Wisconsin |  |  |  |  |  |  |  |
Electric Transmission: |  |  |  |  |  |  |  |
La Crosse, WI to Madison, WI |  | $ | 175 |  |  | $ | 2 |  |  | $ | — |  |  | 37 | %
CapX2020 Transmission |  | 169 |  |  | 15 |  |  | 2 |  |  | 81 |
Total NSP-Wisconsin |  | $ | 344 |  |  | $ | 17 |  |  | $ | 2 |  |  |
(Millions of Dollars) |  | Plant in Service |  | Accumulated Depreciation |  | CWIP |  | Percent Owned
PSCo |  |  |  |  |  |  |  |
Electric Generation: |  |  |  |  |  |  |  |
Hayden Unit 1 |  | $ | 153 |  |  | $ | 76 |  |  | $ | — |  |  | 76 | %
Hayden Unit 2 |  | 149 |  |  | 68 |  |  | — |  |  | 37 |
Hayden Common Facilities |  | 41 |  |  | 21 |  |  | — |  |  | 53 |
Craig Units 1 and 2 |  | 81 |  |  | 40 |  |  | — |  |  | 10 |
Craig Common Facilities |  | 39 |  |  | 21 |  |  | — |  |  | 7 |
Comanche Unit 3 |  | 886 |  |  | 130 |  |  | — |  |  | 67 |
Comanche Common Facilities |  | 28 |  |  | 3 |  |  | — |  |  | 82 |
Electric Transmission: |  |  |  |  |  |  |  |
Transmission and other facilities |  | 183 |  |  | 63 |  |  | 1 |  |  | Various |
Gas Transportation: |  |  |  |  |  |  |  |
Rifle, CO to Avon, CO |  | 22 |  |  | 7 |  |  | — |  |  | 60 |
Gas Transportation Compressor |  | 8 |  |  | 1 |  |  | — |  |  | 50 |
Total PSCo |  | $ | 1,590 |  |  | $ | 430 |  |  | $ | 1 |  |  |
Each company’s share of operating expenses and construction expenditures are included in the applicable utility accounts. Respective owners are responsible for providing their own financing.

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- References No definition available. + Details
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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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