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10-K
2023 FY
NorthWestern Energy Group, Inc.
14 Feb 24
Annual report
7:42pm
Our AROs relate to the reclamation and removal costs at our jointly-owned coal-fired generation facilities, U.S. Department of Transportation requirements to cut, purge and cap retired natural gas pipeline segments, our obligation to plug and abandon oil and gas wells at the end of their life, and to remove all above-ground wind power facilities and restore the soil surface at the end of their life. The following table presents the change in our ARO (in thousands):
December 31, | ||||||||||||||||||||||||||||||||||||
2023 | 2022 | 2021 | ||||||||||||||||||||||||||||||||||
Liability at January 1, | $ | 40,894 | $ | 40,631 | $ | 45,355 | Accretion expense | 1,899 | 1,853 | 2,233 | Liabilities incurred | — | — | — | Liabilities settled | (1,244) | (4,004) | (2,906) | Revisions to cash flows | (125) | 2,414 | (4,051) | Liability at December 31, | $ | 41,424 | $ | 40,894 | $ | 40,631 |
10-K
2023 FY
NorthWestern Energy Group, Inc.
14 Feb 24
Annual report
7:42pm
Details of our generating facilities are described further in the following chart:
Generation Facilities | Fuel Source | Ownership Interest | Owned MW | ||||||||
Big Stone Plant, located near Big Stone City in northeastern South Dakota | Sub-bituminous coal | 23.4% | 111 | ||||||||
Aberdeen Generating Units No. 1 and 2, located near Aberdeen, South Dakota | Natural gas & Liquid Fuel | 100.0% | 80 | ||||||||
Beethoven Wind Project, located near Tripp, South Dakota | Wind | 100.0% | 80 | ||||||||
BGGS, located near Huron, South Dakota | Natural Gas | 100.0% | 58 | ||||||||
Neal Electric Generating Unit No. 4, located near Sioux City, Iowa | Sub-bituminous coal | 8.7% | 57 | ||||||||
Coyote Electric Generating Station, located near Beulah, North Dakota | Lignite coal | 10.0% | 43 | ||||||||
Miscellaneous combustion turbine units and small diesel units (used only during peak periods) | Combination of fuel oil and natural gas | 100.0% | 17 | ||||||||
Total | 446 |
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