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Property Plant and Equipment Property Plant and Equipment (Tables) | 12 Months Ended
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Dec. 31, 2018
Property, Plant and Equipment [Line Items] |
Schedule of Jointly Owned Utility Plants | tility 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.
Public Utility 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.
NSP-Minnesota |
Property, Plant and Equipment [Line Items] |
Schedule of Jointly Owned Utility Plants |
(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 |  |  |
NSP-Wisconsin |
Property, Plant and Equipment [Line Items] |
Schedule of Jointly Owned Utility Plants |
(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 |  |  |
PSCo |
Property, Plant and Equipment [Line Items] |
Schedule of Jointly Owned Utility Plants |
(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 |  |  |

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- Definition Tabular disclosure of proportionate interests in jointly owned utility plants. Includes the amount of plants in service, the accumulated provision for depreciation (if available), the amount of plants under construction, and the proportionate share. The amounts presented may be further subdivided to show amounts applicable to plant subcategories (for example, production, transmission, distribution). Includes statements that the amounts represent the utility's share in each joint plant and that it must provide its own financing. Information concerning two or more generating plants on the same site may be combined. States that the utility's share of direct expenses of the joint plants is included in the corresponding operating expenses on its income statement (for example, fuel, maintenance of plant, other operating expense). If the share of direct expenses is charged to purchased power, then disclose the amount so charged and the proportionate amounts charged to specific operating expenses on the records maintained for the joint plants. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 980 -SubTopic 360 -Section S99 -Paragraph 1 -Subparagraph (SAB Topic 10.C) -URI http://asc.fasb.org/extlink&oid=115995737&loc=d3e659983-123033 + Details
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- Definition Tabular disclosure of public utility 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, deprecation 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 980 -SubTopic 20 -Section 45 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=84167750&loc=d3e42232-110370 Reference 2: 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(b)) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 + Details
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