XML 40 R11.htm IDEA: XBRL DOCUMENT
v3.24.0.1

Property Plant and Equipment Property Plant and Equipment | 12 Months Ended
--- | ---
Dec. 31, 2023
Property, Plant and Equipment [Abstract] |
Property, Plant and Equipment Disclosure | Major classes of property, plant and equipment
(Millions of Dollars) |  | Dec. 31, 2023 |  | Dec. 31, 2022
Property, plant and equipment, net |  |  |  |
Electric plant |  | $ | 52,494 |  |  | $ | 49,639 |
Natural gas plant |  | 9,080 |  |  | 8,514 |
Common and other property |  | 3,190 |  |  | 2,970 |
Plant to be retired (a) |  | 2,055 |  |  | 2,217 |
CWIP |  | 2,873 |  |  | 2,124 |
Total property, plant and equipment |  | 69,692 |  |  | 65,464 |
Less accumulated depreciation |  | (18,399) |  |  | (17,502) |
Nuclear fuel |  | 3,337 |  |  | 3,183 |
Less accumulated amortization |  | (2,988) |  |  | (2,892) |
Property, plant and equipment, net |  | $ | 51,642 |  |  | $ | 48,253 |
(a)Amounts include Sherco 1 and 3 and A.S. King for NSP-Minnesota; Comanche Units 2 and 3, Craig Units 1 and 2, Hayden Units 1 and 2 and coal generation assets at Pawnee pending facility gas conversion for PSCo; and Tolk Unit 1 and 2 and coal generation assets at Harrington pending facility gas conversion for SPS. The Dec. 31, 2022 balance also includes Sherco 2, which was retired on Dec. 31, 2023. 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, 2023:
(Millions of Dollars, Except Percent Owned) |  | Plant in Service |  | Accumulated Depreciation |  |  |  | Percent Owned
NSP-Minnesota |  |  |  |  |  |  |  |
Electric generation: |  |  |  |  |  |  |  |
Sherco Unit 3 |  | $ | 633 |  |  | $ | 480 |  |  |  |  | 59 | %
Sherco common facilities |  | 185 |  |  | 121 |  |  |  |  | 80 |
Sherco substation |  | 5 |  |  | 4 |  |  |  |  | 59 |
Electric transmission: |  |  |  |  |  |  |  |
Grand Meadow |  | 11 |  |  | 4 |  |  |  |  | 50 |
Huntley Wilmarth |  | 49 |  |  | 2 |  |  |  |  | 50 |
CapX2020 |  | 820 |  |  | 141 |  |  |  |  | 51 |
Total NSP-Minnesota (a) |  | $ | 1,703 |  |  | $ | 752 |  |  |  |  |
(a)Projects additionally include $2 million in CWIP.
(Millions of Dollars, Except Percent Owned) |  | Plant in Service |  | Accumulated Depreciation |  |  |  | Percent Owned
NSP-Wisconsin |  |  |  |  |  |  |  |
Electric transmission: |  |  |  |  |  |  |  |
La Crosse, WI to Madison, WI |  | $ | 178 |  |  | $ | 25 |  |  |  |  | 37 | %
CapX2020 |  | 169 |  |  | 39 |  |  |  |  | 80 |
Total NSP-Wisconsin (a) |  | $ | 347 |  |  | $ | 64 |  |  |  |  |
(a)Projects additionally include $1 million in CWIP.
(Millions of Dollars, Except Percent Owned) |  | Plant in Service |  | Accumulated Depreciation |  |  |  | Percent Owned
PSCo |  |  |  |  |  |  |  |
Electric generation: |  |  |  |  |  |  |  |
Hayden Unit 1 |  | $ | 157 |  |  | $ | 108 |  |  |  |  | 76 | %
Hayden Unit 2 |  | 151 |  |  | 87 |  |  |  |  | 37 |
Hayden common facilities |  | 44 |  |  | 31 |  |  |  |  | 53 |
Craig Units 1 and 2 |  | 82 |  |  | 55 |  |  |  |  | 10 |
Craig common facilities |  | 39 |  |  | 25 |  |  |  |  | 7 |
Comanche Unit 3 |  | 916 |  |  | 191 |  |  |  |  | 67 |
Comanche common facilities |  | 29 |  |  | 4 |  |  |  |  | 77 |
Electric transmission: |  |  |  |  |  |  |  |
Transmission and other facilities |  | 189 |  |  | 75 |  |  |  |  | Various
Gas transmission: |  |  |  |  |  |  |  |
Rifle, CO to Avon, CO |  | 28 |  |  | 9 |  |  |  |  | 60 |
Gas transmission compressor |  | 8 |  |  | 2 |  |  |  |  | 50 |
Total PSCo (a) |  | $ | 1,643 |  |  | $ | 587 |  |  |  |  |
(a)Projects additionally include $18 million in CWIP. Each company’s share of operating expenses and construction expenditures is included in the applicable utility accounts. Respective owners are responsible for providing their own financing.

X
- References No definition available. + Details
Name: | us-gaap_PropertyPlantAndEquipmentAbstract
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

X
- 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://fasb.org/us-gaap/role/ref/legacyRef -Topic 360 -Name Accounting Standards Codification -Publisher FASB -URI https://asc.fasb.org//360/tableOfContent Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Name Accounting Standards Codification -Section 50 -Paragraph 6 -SubTopic 360 -Topic 958 -Publisher FASB -URI https://asc.fasb.org//1943274/2147480321/958-360-50-6 Reference 3: http://www.xbrl.org/2003/role/disclosureRef -Name Accounting Standards Codification -Section 50 -Paragraph 1 -Subparagraph (d) -SubTopic 360 -Topic 958 -Publisher FASB -URI https://asc.fasb.org//1943274/2147480321/958-360-50-1 Reference 4: http://www.xbrl.org/2003/role/disclosureRef -Name Accounting Standards Codification -Section 50 -Paragraph 7 -SubTopic 360 -Topic 958 -Publisher FASB -URI https://asc.fasb.org//1943274/2147480321/958-360-50-7 + Details
Name: | us-gaap_PropertyPlantAndEquipmentDisclosureTextBlock
Namespace Prefix: | us-gaap_
Data Type: | dtr-types:textBlockItemType
Balance Type: | na
Period Type: | duration