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Commitments and Contingencies (Tables)
12 Months Ended
Dec. 31, 2021
Commitments and Contingencies Disclosure [Abstract]  
Schedule of Commitments Contractual Obligation Maturities
Our future construction program and other commitments, capacity and energy agreement commitments, coal purchase and coal delivery contract commitments and contractual land easements payments as of December 31, 2021 are as follows:
(in thousands)Construction Program
and Other Commitments
Capacity and Energy
Requirements
Coal Purchase
Commitments
Land
 Easement
Payments
2022$889 $20,390 $22,793 $1,364 
202314,678 11,854 23,955 1,388 
2024879 11,828 23,955 1,412 
2025886 11,784 24,369 1,437 
2026479 11,753 25,103 1,432 
Beyond 20266,697 109,003 428,304 27,461 
Total$24,508 $176,612 $548,479 $34,494