Our property, plant and equipment consists of electric plant and other plant. Both of these are discussed below and are included on our consolidated statements of financial position.

ELECTRIC PLANT: At December 31, 2023, our investment in electric plant and the related annual rates of depreciation or amortization calculated using the straight‑line method are as follows (dollars in thousands):


	Annual Depreciation Rate					Plant In Service		Accumulated Depreciation		Net Book Value
Generation plant	0.89	%	to	6.27	%	$	3,082,133	$	(1,669,941)	$	1,412,192
Transmission plant	1.11	%	to	2.09	%	1,983,629		(708,412)		1,275,217
General plant	1.46	%	to	9.53	%	410,856		(266,013)		144,843
Other	2.75	%	to	10.00	%	246,061		(95,558)		150,503
Electric plant in service (at cost)						$	5,722,679	$	(2,739,924)	2,982,755
Construction work in progress										163,954
Electric plant										$	3,146,709

At December 31, 2022, our investment in electric plant and the related annual rates of depreciation or amortization calculated using the straight‑line method are as follows (dollars in thousands):


	Annual Depreciation Rate					Plant In Service		Accumulated Depreciation		Net Book Value
Generation plant	0.89	%	to	6.27	%	$	3,048,918	$	(1,353,042)	$	1,695,876
Transmission plant	1.11	%	to	2.09	%	1,956,378		(690,517)		1,265,861
General plant	1.46	%	to	9.53	%	412,879		(257,761)		155,118
Other	2.75	%	to	10.00	%	241,248		(91,043)		150,205
Electric plant in service (at cost)						$	5,659,423	$	(2,392,363)	3,267,060
Construction work in progress										81,555
Electric plant										$	3,348,615

At December 31, 2023, we had $38.9 million of commitments to complete construction projects, of which approximately $19.5, $15.3 and $4.1 million are expected to be incurred in 2024, 2025 and 2026, respectively.

JOINTLY OWNED FACILITIES: Our share in each jointly owned facility is as follows as of December 31, 2023 (these electric plant in service, accumulated depreciation and construction work in progress amounts are included in the electric plant table above) (dollars in thousands):


	Tri-State Share		Electric Plant in Service		Accumulated Depreciation		Construction Work In Progress
Yampa Project - Craig Generating Station Units 1 and 2	24.00	%	$	392,510	$	358,839	$	23
MBPP - Laramie River Station	28.50	%	540,365		346,959		2,114
Total			$	932,875	$	705,798	$	2,137

OTHER PLANT: Other plant consists of mine assets (discussed below) and non‑utility assets which consist of facilities not in service, land and irrigation equipment.

We own 100 percent of Elk Ridge Mining and Reclamation, LLC (“Elk Ridge”), organized for the purpose of acquiring coal reserves and supplying coal to us. Elk Ridge is the owner of the Colowyo Mine, a surface coal mine near Craig, Colorado, and the New Horizon Mine near Nucla, Colorado. The New Horizon Mine is in post-reclamation monitoring and no longer produces coal. The expenses related to the Colowyo Mine coal used by us are included in fuel expense on our consolidated statements of operations.


	December 31, 2023		December 31, 2022
Colowyo Mine assets	$	396,441	$	386,898
New Horizon Mine assets	6,448		5,995

Accumulated depreciation and depletion	(184,239)		(155,653)
Net mine assets	218,650		237,240
Non-utility assets	549,430		561,251
Accumulated depreciation	(527,658)		(539,121)
Net non-utility assets	21,772		22,130
Net other plant	$	240,422	$	259,370