Jointly-Owned Facilities and Assets (Tables)

12 Months Ended

Dec. 31, 2023

Jointly-Owned Facilities and Assets [Abstract]

Jointly-Owned Facilities and Assets

Minnesota Power’s investments in jointly-owned facilities and assets and the related ownership percentages are as follows:

Regulated Utility Plant	Plant in Service	Accumulated Depreciation	Construction Work in Progress	% Ownership
Millions
As of December 31, 2023
Boswell Unit 4	$725.9	$369.8	$2.8	80
Transmission Assets	101.0	23.6	—	9.3 - 14.7
Total	$826.9	$393.4	$2.8
As of December 31, 2022
Boswell Unit 4	$712.0	$340.1	$3.3	80
Transmission Assets	101.0	21.1	—	9.3 - 14.7
Total	$813.0	$361.2	$3.3