XML 40 R20.htm IDEA: XBRL DOCUMENT
v3.25.0.1

Property, Plant and Equipment | 12 Months Ended
--- | ---
Dec. 31, 2024
Property, Plant and Equipment [Abstract] |
Property, Plant and Equipment | PROPERTY, PLANT AND EQUIPMENT
($ millions) | Cost |  | Accumulated Depreciation |  | Net Book Value
2024 |  |  |  |  |
Distribution |  |  |  |  |
Electric | 15,771 |  |  | (4,078) |  |  | 11,693 |
Gas | 7,148 |  |  | (1,866) |  |  | 5,282 |
Transmission |  |  |  |  |
Electric | 23,084 |  |  | (4,865) |  |  | 18,219 |
Gas | 2,937 |  |  | (894) |  |  | 2,043 |
Generation | 8,056 |  |  | (3,110) |  |  | 4,946 |
Other | 5,014 |  |  | (1,809) |  |  | 3,205 |
Assets under construction | 3,578 |  |  | — |  |  | 3,578 |
Land | 490 |  |  | — |  |  | 490 |
|  | 66,078 |  |  | (16,622) |  |  | 49,456 |
2023 |
Distribution |  |  |  |  |
Electric | 14,352 |  |  | (3,708) |  |  | 10,644 |
Gas | 6,682 |  |  | (1,736) |  |  | 4,946 |
Transmission |  |  |  |  |
Electric | 19,886 |  |  | (4,267) |  |  | 15,619 |
Gas | 2,751 |  |  | (843) |  |  | 1,908 |
Generation | 7,192 |  |  | (2,739) |  |  | 4,453 |
Other | 4,444 |  |  | (1,645) |  |  | 2,799 |
Assets under construction | 2,581 |  |  | — |  |  | 2,581 |
Land | 435 |  |  | — |  |  | 435 |
|  | 58,323 |  |  | (14,938) |  |  | 43,385 |
Electric distribution assets are those used to distribute electricity at lower voltages (generally below 69 kilovolts ("kV")). These assets include poles, towers and fixtures, low-voltage wires, transformers, overhead and underground conductors, street lighting, meters, metering equipment and other related equipment. Gas distribution assets are those used to transport natural gas at low pressures (generally below 2,070 kilopascals ("kPa")). These assets include distribution stations, telemetry, distribution pipe for mains and services, meter sets and other related equipment. Electric transmission assets are those used to transmit electricity at higher voltages (generally at 69 kV and higher). These assets include poles, wires, switching equipment, transformers, support structures and other related equipment. Gas transmission assets are those used to transport natural gas at higher pressures (generally at 2,070 kPa and higher). These assets include transmission stations, telemetry, transmission pipe and other related equipment. Generation assets are those used to generate electricity. These assets include hydroelectric and thermal generation stations, gas and combustion turbines, coal-fired generating stations, dams, reservoirs, photovoltaic systems, wind resources and other related equipment. Other assets include buildings, equipment, vehicles, inventory, and information technology assets. As at December 31, 2024, assets under construction largely reflect ongoing transmission projects at ITC and UNS Energy, as well as the Roadrunner Reserve battery storage projects at UNS Energy and the Eagle Mountain Pipeline project at FortisBC Energy. The cost of PPE under finance lease as at December 31, 2024 was $324 million (2023 - $318 million) and related accumulated depreciation was $119 million (2023 - $113 million) (Note 15). Jointly Owned Facilities UNS Energy and ITC hold undivided interests in jointly owned generating facilities and transmission systems, are entitled to their pro rata share of the PPE, and are proportionately liable for the associated operating costs and liabilities. As at December 31, 2024, interests in jointly owned facilities consisted of the following.
| Ownership |  |  |  | Accumulated |  | Net Book
($ millions, except as indicated) | (%) |  | Cost |  | Depreciation |  | Value
Transmission Facilities | Various |  | 1,704 |  |  | (489) |  |  | 1,215 |
Springerville Common Facilities | 86.0 |  |  | 580 |  |  | (344) |  |  | 236 |
Springerville Coal Handling Facilities | 83.0 |  |  | 299 |  |  | (154) |  |  | 145 |
Four Corners Units 4 and 5 ("Four Corners") | 7.0 |  |  | 311 |  |  | (155) |  |  | 156 |
Gila River Common Facilities | 50.0 |  |  | 131 |  |  | (52) |  |  | 79 |
Luna Energy Facility ("Luna") | 33.3 |  |  | 101 |  |  | 3 |  |  | 104 |
|  |  | 3,126 |  |  | (1,191) |  |  | 1,935 |

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/1943274/2147477798/958-360-50-6 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/1943274/2147477798/958-360-50-1 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/1943274/2147477798/958-360-50-7 + Details
Name: | us-gaap_PropertyPlantAndEquipmentDisclosureTextBlock
Namespace Prefix: | us-gaap_
Data Type: | dtr-types:textBlockItemType
Balance Type: | na
Period Type: | duration