Long-Term Debt	6 Months Ended
Jun. 30, 2025
Debt Disclosure [Abstract]
Long-Term Debt	NOTE 9. LONG-TERM DEBT Avista Corp. In July 2025, the Company issued and sold $120 million of 6.18 percent first mortgage bonds due in 2055 with institutional investors in the private placement market. In connection with the pricing of the first mortgage bonds in July 2025, the Company cash-settled one interest rate swap derivative (notional aggregate amount of $10 million) and received a net amount of $1 million, which will be amortized as a component of interest expense over the life of the debt. See Note 5 for discussion of interest rate swap derivatives. The net proceeds from the sale of the bonds were used to repay a portion of the borrowings outstanding under the Company's committed line of credit. AEL&P In July 2025, AEL&P entered into a term loan agreement in the amount of $20 million with an interest rate of 5.49 percent and a maturity date of July 2030. AEL&P borrowed the entire $20 million available under the agreement, and used the net proceeds to repay borrowings outstanding under AEL&P's committed line of credit, as well as fund capital expenditures.

Long-Term Debt

6 Months Ended

Jun. 30, 2025

NOTE 9. LONG-TERM DEBT

Avista Corp.

In July 2025, the Company issued and sold $120 million of 6.18 percent first mortgage bonds due in 2055 with institutional investors in the private placement market. In connection with the pricing of the first mortgage bonds in July 2025, the Company cash-settled one interest rate swap derivative (notional aggregate amount of $10 million) and received a net amount of $1 million, which will be amortized as a component of interest expense over the life of the debt. See Note 5 for discussion of interest rate swap derivatives.

The net proceeds from the sale of the bonds were used to repay a portion of the borrowings outstanding under the Company's committed line of credit.

AEL&P

In July 2025, AEL&P entered into a term loan agreement in the amount of $20 million with an interest rate of 5.49 percent and a maturity date of July 2030. AEL&P borrowed the entire $20 million available under the agreement, and used the net proceeds to repay borrowings outstanding under AEL&P's committed line of credit, as well as fund capital expenditures.