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LONG-TERM DEBT | 12 Months Ended
--- | ---
Dec. 31, 2024
LONG-TERM DEBT |
LONG-TERM DEBT | NOTE 18. LONG-TERM DEBT Long-term debt on our Consolidated Balance Sheets consists of the following: ​
​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | December 31, | ​ | December 31,
​ |  | 2024 |  | 2023
​ | ​ | (in thousands)
Convertible Notes due 2028, 2.5% interest | ​ | $ | 575,000 | ​ | $ | 575,000
Term Loan Facility | ​ | ​ | — | ​ | ​ | 355,000
Gross long-term debt, including current maturities | ​ | ​ | 575,000 | ​ | ​ | 930,000
Less: debt discount | ​ | ​ | (10,305) | ​ | ​ | (14,321)
Net long-term debt, including current maturities | ​ | ​ | 564,695 | ​ | ​ | 915,679
Less: current maturities | ​ | ​ | — | ​ | ​ | (20,000)
Net long-term debt | ​ | $ | 564,695 | ​ | $ | 895,679
​ For all periods presented, we were in compliance with the covenants under all debt agreements. The following table summarizes interest expense related to our debt: ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | Years Ended December 31,
​ |  | 2024 |  | 2023 |  | 2022
​ | ​ | (in thousands)
Interest expense | ​ | $ | 21,997 | ​ | $ | 15,186 | ​ | $ | 6,607
Amortization of debt issuance costs | ​ | ​ | 3,219 | ​ | ​ | 1,330 | ​ | ​ | 547
Total interest expense related to debt | ​ | $ | 25,216 | ​ | $ | 16,516 | ​ | $ | 7,154
​ Credit Agreement Our credit agreement dated as of September 10, 2019, as amended (the “Credit Agreement”) consists of a senior unsecured term loan facility (“Term Loan Facility”) and a senior unsecured revolving facility (“Revolving Facility”), both maturing on September 9, 2026. On September 9, 2024, we entered into an amendment to the Credit Agreement to increase the capacity on the Revolving Facility from $200.0 million to $600.0 million. This amendment was in connection with the concurrent prepayment, using existing cash on hand, of the full $345.0 million outstanding principal balance under our Term Loan Facility. For all periods presented, no amounts were outstanding on the Revolving Facility. The following table summarizes our availability to withdraw on the Revolving Facility: ​
​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | December 31, | ​ | December 31,
​ |  | 2024 |  | 2023
​ | ​ | (in thousands)
Available capacity on Revolving Facility | ​ | $ | 600,000 | ​ | $ | 200,000
​ In addition to our available capacity on the Revolving Facility, prior to the maturity date of the Credit Agreement, we may request an increase to the financing commitments in either the Term Loan Facility or Revolving Facility by an aggregate amount not to exceed $250.0 million. Any requested increase is subject to lender approval. The interest rate swap contracts previously entered into relative to the Term Loan Facility expired on September 10, 2024. Should we have future borrowings under the Term Loan Facility or Revolving Facility, they will bear interest, at our option, at a rate based on the Base Rate or SOFR, as defined in the Credit Agreement, plus an applicable margin. ​ Convertible Senior Notes due 2028 On September 12, 2023, we completed a private, unregistered offering of $575.0 million aggregate principal amount of 2.50% convertible senior notes due 2028 (“Convertible Notes”). The $564.7 million remaining outstanding principal amount of the Convertible Notes, net of unamortized issuance costs, continues to be classified as long-term debt as none of the conversion triggers occurred as of December 31, 2024. The Convertible Notes mature on September 15, 2028, unless earlier repurchased, redeemed, or converted. Interest is payable semi-annually in arrears in March and September. We do not maintain a sinking fund. We may redeem for cash all or any portion of the Convertible Notes, at our option, on or after September 20, 2026 if the last reported sale price of our common stock has been at least 130% of the conversion price then in effect for at least 20 trading days (whether or not consecutive) during any 30 consecutive trading-day period (including the last trading day of such period). The redemption price is 100% of the principal amount plus accrued and unpaid interest. Prior to May 15, 2028, holders have the option to convert all or a portion of their Convertible Notes under the following circumstances:
| ● | during any calendar quarter if the last reported sale price of our common stock, for at least 20 trading days (whether or not consecutive) during a period of 30 consecutive trading days is greater than or equal to 130% of the conversion price on each applicable trading day;
| ● | during the five business day period immediately after any five consecutive trading day period in which the trading price per $1,000 principal amount of the Convertible Notes for each trading day was less than 98% of the product of the last reported sale price of our common stock on each such trading day and the conversion rate on each such trading day;
| ● | if Advanced Energy calls any or all of the Convertible Notes for redemption; or
| ● | upon the occurrence of specified corporate transactions or events described in the indenture.
From May 15, 2028 through the maturity date, holders have the option to convert at any time regardless of circumstances. The initial conversion rate is 7.2747 shares of common stock per $1,000 principal amount, which is equivalent to an initial conversion price of approximately $137.46 per share of common stock. The conversion rate is subject to adjustment upon the occurrence of certain specified events as set forth in the indenture. Upon conversion, Advanced Energy will do the following:
| ● | pay cash up to the aggregate principal amount to be converted; and
| ● | pay or deliver cash, shares of our common stock, or a combination (at our election) with respect to the remainder, if any, of the conversion obligation in excess of the aggregate principal amount being converted.
Concurrent with the Convertible Notes issuance, we entered into hedges (“Note Hedges”) with respect to our common stock and sold warrants to purchase our common stock (“Warrants”). In combination, the Note Hedges and Warrants synthetically increase the initial conversion price on the Convertible Notes from $137.46 to $179.76, reducing the potential dilutive effect. The Warrants provide the counterparties the option to acquire approximately 4.2 million aggregate shares of our common stock (subject to customary anti-dilution adjustments), which is the same number of shares of our common stock covered by the Note Hedges at a $179.76 per share initial exercise price, which represents a 70% premium over the $105.74 closing price of our common stock on September 7, 2023. The Warrants expire on July 7, 2029. If the market value per share of our common stock exceeds the exercise price of the Warrants during the measurement period at the maturity of such Warrants, the Warrants will have a dilutive effect on our earnings per share as we will owe the counterparties a number of shares of common stock in an amount based on the excess of such market price per share of the common stock over the Warrants’ exercise price. The Note Hedge and Warrants are separate from the Convertible Notes. The Convertible Notes holders have no rights with respect to the Note Hedges and Warrants. Counterparties in the Note Hedge and Warrants transactions have no rights with respect to the Convertible Notes. We use level 2 measurements to estimate the fair value of our debt. As of December 31, 2024, we estimate the fair value of our Convertible Notes to be $624.6 million.

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