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v3.23.2

Subsequent events - Groton Back-Leverage Financing (Details) - USD ($) |  |  | 9 Months Ended |
--- | --- | --- | --- | ---
Aug. 18, 2023 | May 19, 2023 | Jul. 31, 2023 | May 22, 2023
Subsequent Event [Line Items] |  |  |  |
Payments of debt issuance costs |  |  | $ 2,917,000 |
Interest rate (as a percent) |  |  |  | 3.716%
Trailing period for debt service coverage ratio |  | 12 months |  |
U.S. Treasury Note | Subordinated Back Leverage Loan Facility |  |  |  |
Subsequent Event [Line Items] |  |  |  |
Debt instrument term | 10 years |  |  |
Basis points | 275 |  |  |
Floor rate (as a percent) | 5.00% |  |  |
U.S. Treasury Note | Subordinated Back Leverage Loan Facility | Step Down Date |  |  |  |
Subsequent Event [Line Items] |  |  |  |
Interest rate (as a percent) | 8.00% |  |  |
U.S. Treasury Note | Subordinated Back Leverage Loan Facility | After the Step Down Date |  |  |  |
Subsequent Event [Line Items] |  |  |  |
Interest rate (as a percent) | 8.00% |  |  |
Subsequent Event | Liberty Lender | Senior Back Leverage Loan Facility |  |  |  |
Subsequent Event [Line Items] |  |  |  |
Interest rate (as a percent) | 6.75% |  |  |
Annual carbon emissions price multiplier | 12.66 |  |  |
Subsequent Event | Liberty Lender | Senior Back Leverage Loan Facility | Carbon Offset Event Continuing |  |  |  |
Subsequent Event [Line Items] |  |  |  |
Interest rate (as a percent) | 7.32% |  |  |
Subsequent Event | Liberty Lender | Senior Back Leverage Loan Facility | Carbon Offset Event Non Continuing |  |  |  |
Subsequent Event [Line Items] |  |  |  |
Interest rate (as a percent) | 6.07% |  |  |
Subsequent Event | Groton Back-Leverage Financing |  |  |  |
Subsequent Event [Line Items] |  |  |  |
Gross proceeds from debt | $ 20,000,000.0 |  |  |
Payments of debt issuance costs | 400,000 |  |  |
Net proceeds from debt | 19,600,000 |  |  |
Payment to fund DSCR Reserve Accounts | 1,700,000 |  |  |
Payment to fund O&M Reserve Accounts | 6,500,000 |  |  |
Output shortfall payments | 1,300,000 |  |  |
Unrestricted cash | $ 3,000,000.0 |  |  |
Term to acquire interest at flip point | 90 days |  |  |
Subsequent Event | Groton Back-Leverage Financing | Subordinated Back Leverage Loan Facility |  |  |  |
Subsequent Event [Line Items] |  |  |  |
Excess cashflow available to borrower (as a percent) | 50.00% |  |  |
Term following commercial operations date and termination of the Amended and Restated PPA | 20 years |  |  |
Term of interest only period | 84 months |  |  |
Subsequent Event | Groton Back-Leverage Financing | Liberty Lender |  |  |  |
Subsequent Event [Line Items] |  |  |  |
Loan provided by lender (as a percentage) | 50.00% |  |  |
Payment to fund DSCR Reserve Accounts | $ 830,000 |  |  |
Payment to fund O&M Reserve Accounts | $ 3,250,000 |  |  |
Subsequent Event | Groton Back-Leverage Financing | Amalgamated Lender |  |  |  |
Subsequent Event [Line Items] |  |  |  |
Loan provided by lender (as a percentage) | 50.00% |  |  |
Payment to fund DSCR Reserve Accounts | $ 830,000 |  |  |
Payment to fund O&M Reserve Accounts | 3,250,000 |  |  |
Subsequent Event | Groton Back-Leverage Financing | Back Leverage Lenders |  |  |  |
Subsequent Event [Line Items] |  |  |  |
Payment to fund DSCR Reserve Accounts | $ 11,100,000 |  |  |
Subsequent Event | Groton Back-Leverage Financing | Senior Back Leverage Lenders |  |  |  |
Subsequent Event [Line Items] |  |  |  |
Amortization period | 10 years |  |  |
Debt instrument term | 7 years |  |  |
Debt service coverage ratio | 1.20% |  |  |
Trailing period for debt service coverage ratio | 12 months |  |  |
Subsequent Event | Groton Back-Leverage Financing | Senior Back Leverage Lenders | Prepayment on or prior to the second anniversary |  |  |  |
Subsequent Event [Line Items] |  |  |  |
Prepayment fee (as percentage) | 3.00% |  |  |
Subsequent Event | Groton Back-Leverage Financing | Senior Back Leverage Lenders | Prepayment after second anniversary of the closing date but on or prior to the fourth anniversary |  |  |  |
Subsequent Event [Line Items] |  |  |  |
Prepayment fee (as percentage) | 2.00% |  |  |
Subsequent Event | Groton Back-Leverage Financing | Senior Back Leverage Lenders | Prepayment after fourth anniversary of the closing date but on or prior to the seventh anniversary |  |  |  |
Subsequent Event [Line Items] |  |  |  |
Prepayment fee (as percentage) | 1.00% |  |  |
Subsequent Event | Groton Back-Leverage Financing | Senior Back Leverage Lenders | Maximum |  |  |  |
Subsequent Event [Line Items] |  |  |  |
Term loan facility | $ 12,000,000.0 |  |  |
Subsequent Event | Groton Back-Leverage Financing | Subordinated Back Leverage Lenders |  |  |  |
Subsequent Event [Line Items] |  |  |  |
Payment to fund DSCR Reserve Accounts | $ 300,000 |  |  |
Debt service coverage ratio | 1.10% |  |  |
Trailing period for debt service coverage ratio | 12 months |  |  |
Subsequent Event | Groton Back-Leverage Financing | Subordinated Back Leverage Lenders | Senior back and leverage back | Maximum |  |  |  |
Subsequent Event [Line Items] |  |  |  |
Gross proceeds from debt | $ 8,000,000.0 |  |  |
Subsequent Event | Connecticut Green Bank Loans |  |  |  |
Subsequent Event [Line Items] |  |  |  |
Unrestricted cash | $ 6,800,000 |  |  |

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