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DEBT AND FINANCING LEASE LIABILITIES | 9 Months Ended
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Sep. 30, 2025
Debt Disclosure [Abstract] |
DEBT AND FINANCING LEASE LIABILITIES | DEBT AND FINANCING LEASE LIABILITIES Our debt and financing lease liabilities are comprised of the following:
| September 30, 2025 |  | December 31, 2024
Senior secured corporate revolving credit facility (1) | $ | 110,000 |  |  | $ | 135,000 |
Senior secured corporate term loans | 96,250 |  |  | 13,000 |
Second lien corporate term loan | 100,000 |  |  | 100,000 |
Energy asset construction facilities (2) | 596,586 |  |  | 339,209 |
Energy asset operating facilities (2) | 613,327 |  |  | 674,704 |
Other financing facilities (3) | 402,192 |  |  | 399,370 |
Financing lease liabilities (4) | 12,655 |  |  | 12,904 |
Total debt and financing lease liabilities | 1,931,010 |  |  | 1,674,187 |
Less: current maturities | 167,083 |  |  | 149,363 |
Less: unamortized discount and debt issuance costs | 47,238 |  |  | 40,924 |
Long-term debt and financing lease liabilities, net of current portion, unamortized discount and debt issuance costs | $ | 1,716,689 |  |  | $ | 1,483,900 |
(1) At September 30, 2025, funds of $26,629 were available for borrowing under this facility.
(2) Most of these agreements are now using the Secured Overnight Financing Rate (“SOFR”) as the primary reference rate used to calculate interest.
(3) These facilities are accounted for as failed sale-leasebacks and are classified as long-term financing facilities. See Note 7 for additional disclosures.
(4) Financing lease liabilities are sale-leaseback arrangements under previous guidance.
Senior Secured Corporate Credit Facility On January 23, 2025, we refinanced our term loan and revolving credit facility by enteri ng into a sixth amended and restated senior secured credit agreement (“Restated Credit Agreement”) with the group of lenders thereto. The interest rate for borrowings is based on, at our option, either the Base Rate plus a margin of 0.75% to 1.75%, depending on our core leverage ratio; or the Term SOFR plus a margin of 1.75% to 2.75%, depending on our core leverage ratio. A commitment fee of between 0.25% and 0.375%, depending on our core leverage ratio, is payable quarterly on the undrawn portion of the revolver. As of September 30, 2025, the interest rates were 7.06% and 7.71% per annum for the term loan and revolving credit facility, respectively. At closing we paid $2,345 in lenders fees and debt issuance costs. Proceeds from this agreement in the amount of $180,000 and $13,000 were used to pay the balance of our revolving credit facility and the outstanding portion of the senior secured term loan, respectively, at closing. The Restated Credit Agreement replaced and extended Ameresco's existing credit agreement dated March 4, 2022, and subsequently amended (the “Original Credit Agreement”). The Restated Credit Agreement refinanced the credit facilities under the Original Credit Agreement and replaced it with the following facilities: •a $225,000 revolving credit facility, maturing on December 28, 2028, and •a $100,000 term loan, maturing on December 28, 2028 The revolver may be increased by up to an additional $100,000 at Ameresco's option if lenders are willing to provide such increased commitments, subject to certain conditions. Additional t erms of the Restated Credit Agreement are as follows: •the term loan requires quarterly principal payments of $1,250 starting March 31, 2025, with the balance due at maturity •the revolving credit facility requires payment at maturity •a debt service coverage ratio (as defined in the agreement) of at least 1.5 to 1.0 •a total funded debt to EBITDA of less than 3.5 to 1.0 April 2025 Senior Secured Notes, 6.72%, due September 30, 2045 and Term Shelf Note On April 30, 2025 we entered into a note purchase agreement and private shelf agreement which includes committed proceeds under series A notes of $78,000 to finance a battery energy storage asset in development, with a maturity date of September 30, 2045, and a fixed interest rate of 6.72% per annum. Gross proceeds from the initial issuance on April 30, 2025 were $67,708 with the remaining $10,291 issued on June 27, 2025. At closing, we incurred $3,126 in lenders fees and debt issuance costs. In connection with this note, we recorded one derivative instrument for make-whole provisions with an initial value of $3,040 which was recorded as debt discount. The agreement also includes a 20-year term $300,000 private shelf facility, as well as the ability to issue series B notes with a maturity date of September 30, 2045 on or before December 31, 2025. As part o f this transaction, we signed a tax credit transfer agreement for the investment tax credits associated with the BESS asset. Upon the asset achieving commercial operations, we will receive proceeds from the ITC transfer and a $30,000 prepayment on the note purchase agreement will be required. May 2025, Term Loan, 6.62%, due December 31, 2037 On May 27, 2025, we entered into a term loan agreement which provided a term loan in a principal amount of $12,221 with a maturity date of December 31, 2037. The term loan bears a fixed interest rate of 6.62%. Interest is payable quarterly. At closing, we incurred $402 in lenders fees and debt issuance costs. Proceeds from this term loan in the amount of $8,273 were used to pay a portion of the October 2012 term loan. In connection with this term loan we recorded one derivative instrument for a make-whole provision with an initial value of $347 which was recorded as debt discount. See Note 12 for additional information about the derivative instruments. October 2012, Term Loan, 6.87%, due June 30, 2025 On May 27, 2025, we paid off the term loan with a balance of $31,086, partially with $8,273 from the May 2025 term loan proceeds and the remainder with working capital cash. With this debt termination, we also terminated four interest rate swap contracts that were not previously designated as hedged instruments. October 2022, Financing Facility, 8.75%, due September 26, 2040 On May 27, 2025 we entered into an omnibus amendment a s part of a tax credit transfer agreement for investment tax credits. The amendment required a $7,000 principal payment, which was made during the nine months ended September 30, 2025. On September 26, 2025 we entered into an amendment to modify the May 27, 2025 omnibus amendment. This amendment included advances of $25,500 related to an expansion project and $15,653 related to a true-up payment in connection to the removal of an IRR residual income requirement. Prior to this amendment, the loan bore interest at a rate of 6.70% with a residual percentage of distributable cash flows payable after the maturity date of the loan, until the earlier of the lender achieving an 8.51% internal rate of return (“IRR”) on funds borrowed under the facility, or the facility discharge date. The interest rate is now fixed at 8.75% and the maturity date changed from August 31, 2039 to September 26, 2040. At September 30, 2025, $348,182 was outstanding under this facility, net of unamortized debt discount and issuance costs. August 2023, Construction Credit Facility, 8.31%, due December 15, 2027 During the nine months ended September 30, 2025, we drew an additional $171,448, paid down $75,272, and at September 30, 2025, $408,483 was outstanding under this facility, net of unamortized debt discount and issuance costs. The Powin bankruptcy triggered a default under this facility, requiring us to move the project associated with the battery payment deposits we made to Powin out of this facility. There were other administrative errors which resulted in defaults under this facility. We received the appropriate waivers for these defaults. In addition, we received a waiver to temporarily increase our maximum commitment of $400,000 to $415,000 until November 30, 2025. June 2020, Construction Credit Facility, 5.92%, due March 31, 2026 During the nine months ended September 30, 2025, we entered into an amendment to extend this revolver, and the current maturity date is March 31, 2026. As of September 30, 2025, $19,505 was outstanding under this facility and $80,495 was available for borrowing. October 2025 Senior Secured First Lien Term Notes, 5.71%, due December 31, 2043, Second Lien Term Notes, 7.40%, due September 30, 2040 and Term Shelf Note On October 31, 2025 we entered into a note purchase agreement and private shelf agreement which includes committed proceeds under series A notes and second lien notes of $34,356 and $15,129, with maturity dates of December 31, 2043 and September 30, 2040, and fixed interest rates of 5.71% and 7.40% per annum, respectively. At closing, we incurred $763 in lenders fees and debt issuance costs. The agreement also includes a 20-year term $80,000 private shelf facility. Other Financing Facilities These facilities are accounted for as failed sale-leasebacks and are classified as long-term financing facilities. August 2018 Master Sale-leaseback We enter into amendments to our August 2018 master lease and participation agreement from time to time, which may extend the maturity date, increase the availability, or modify other covenants. During the nine months ended September 30, 2025, we entered into an amended and restated participation agreement which extended the participation date from September 30, 2025 to March 31, 2026. During the nine months ended September 30, 2025, we were in default of certain lien provisions of this agreement. On June 30, 2025, we received a waiver of this default which is valid until December 31, 2025. We sold and leased back eight energy assets for $28,554 in cash proceeds under this facility during the nine months ended September 30, 2025. December 2020 Master Sale-leaseback We enter into amendments to our December 2020 master lease and participation agreement from time to time, which may extend the maturity date, increase the availability, or modify other covenants. As of September 30, 2025, we were in default under this agreement as we had failed to satisfy the historical coverage ratio under this agreement and on October 31, 2025 we received a waiver of this default.

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