Commitments and Contingencies - Narrative (Details)	1 Months Ended	6 Months Ended
	Sep. 30, 2022 USD ($)	Jun. 30, 2023 USD ($) contract item	Jun. 30, 2021 USD ($)
Gain Contingencies [Line Items]
Liabilities associated with indemnities		$ 0
Losses accrual for known contingent liability		0
Environmental liabilities		$ 0
Number of long-term fuel supply contracts | contract		3
Contractual obligation		$ 2,900,000	$ 10,200,000
Engineering fee payable		$ 600,000
Number of commitments with collateral | item		2
Commitment collateral, percentage of renewable energy credits		100.00%
Development Agreement with Juhl
Gain Contingencies [Line Items]
Collaborative arrangement, development charges committed to pay	$ 8,600,000
Collaborative arrangement, advanced development fee payments committed	900,000
Collaborative arrangement reimbursable costs	1,200,000
Collaborative arrangement, development charges committed, upon completion	$ 6,500,000