Avista Corporation – Indentures Watch

from 8-K 52 pages Avista Corporation to Citibank, N.A. as Successor Trustee Under Mortgage and Deed of Trust, Dated as of June 1, 1939 Seventieth Supplemental Indenture Providing Among Other Things for Two Series of Bonds Designated "First Mortgage Bonds, 4.77% Series Due 2029" Due May 1, 2029 and "First Mortgage Bonds, 6.10% Series Due 2056" Due May 1, 2056 Dated as of May 1, 2026 Seventieth Supplemental Indenture

from 8-K 41 pages Avista Corporation to Citibank, N.A. as Successor Trustee Under Mortgage and Deed of Trust, Dated as of June 1, 1939 Sixty-Ninth Supplemental Indenture Providing Among Other Things for a Series of Bonds Designated "First Mortgage Bonds, 6.18% Series Due 2055" Due July 1, 2055 and for Certain Amendments to Such Mortgage and Deed of Trust Dated as of July 1, 2025 Sixty-Ninth Supplemental Indenture

from 10-Q 10 pages Avista Corporation Description of Common Stock (Registered Under Section 12(b) of the Securities Exchange Act of 1934)

from 10-K 3 pages The Company Has Entered Into a Remarketing and Bond Purchase Agreement, Dated March 7, 2024 (The “Agreement”), Among Bofa Securities, Inc., as Remarketing Agent, Bofa Securities, Inc. and Keybanc Capital Markets Inc., as Underwriters, and the Company, Pursuant to Which the Bonds Are to Be Remarketed, Reoffered and Sold on April 1, 2024. if for Any Reason the Transactions Contemplated in the Agreement Are Not Consummated, the Waiver Made by the Company in the Next Preceding Paragraph of This Letter Shall Be Automatically Rescinded, Without Further Act, and Shall Be of No Force or Effect. Very Truly Yours, Avista Corporation By: /S/ Jason E. Lang Name: Jason E. Lang Title: Assistant Treasurer Director of Finance and Risk Authorized Company Representative

from 10-K 3 pages The Company Has Entered Into a Remarketing and Bond Purchase Agreement, Dated March 7, 2024 (The “Agreement”), Among Bofa Securities, Inc., as Remarketing Agent, Bofa Securities, Inc. and Keybanc Capital Markets Inc., as Underwriters, and the Company, Pursuant to Which the Bonds Are to Be Remarketed, Reoffered and Sold on April 1, 2024. if for Any Reason the Transactions Contemplated in the Agreement Are Not Consummated, the Waiver Made by the Company in the Next Preceding Paragraph of This Letter Shall Be Automatically Rescinded, Without Further Act, and Shall Be of No Force or Effect. Very Truly Yours, Avista Corporation By: /S/ Jason E. Lang Name: Jason E. Lang Title: Assistant Treasurer Director of Finance and Risk Authorized Company Representative

from 8-K 31 pages Avista Corporation to Citibank, N.A. as Successor Trustee Under Mortgage and Deed of Trust, Dated as of June 1, 1939 Sixty-Eighth Supplemental Indenture Providing Among Other Things for a Series of Bonds Designated "First Mortgage Bonds, Collateral Series 2023a" Due June 8, 2028 Dated as of June 1, 2023

from 8-K 32 pages Avista Corporation to Citibank, N.A. as Successor Trustee Under Mortgage and Deed of Trust, Dated as of June 1, 1939 Sixty-Seventh Supplemental Indenture Providing Among Other Things for a Series of Bonds Designated "First Mortgage Bonds, 5.66% Series Due 2053" Due April 1, 2053 Dated as of March 1, 2023 Sixty-Seventh Supplemental Indenture

from 10-K 14 pages Avista Corporation Description of Common Stock (Registered Under Section 12(b) of the Securities Exchange Act of 1934, as Amended)

from 8-K 41 pages Avista Corporation to Citibank, N.A. as Successor Trustee Under Mortgage and Deed of Trust, Dated as of June 1, 1939 Sixty-Sixth Supplemental Indenture Providing Among Other Things for a Series of Bonds Designated “First Mortgage Bonds, 4.00% Series Due 2052” Due March 1, 2052 Dated as of March 1, 2022 Sixty-Sixth Supplemental Indenture

from 10-K 14 pages Avista Corporation Description of Common Stock (Registered Under Section 12(b) of the Securities Exchange Act of 1934, as Amended)

from 8-K 32 pages Avista Corporation to Citibank, N.A. as Successor Trustee Under Mortgage and Deed of Trust, Dated as of June 1, 1939 Sixty-Fifth Supplemental Indenture Providing Among Other Things for a Series of Bonds Designated “First Mortgage Bonds, 2.90% Series Due 2051” Due October 1, 2051 Dated as of September 1, 2021 Sixty-Fifth Supplemental Indenture

from 10-K 13 pages Description of Common Stock (Registered Under Section 12(b) of the Securities Exchange Act of 1934, as Amended)

from 8-K 28 pages To Citibank, N.A. as Successor Trustee Under Mortgage and Deed of Trust, Dated as of June 1, 1939 Sixty-Fourth Supplemental Indenture Providing Among Other Things for a Series of Bonds Designated “First Mortgage Bonds, 3.07% Series Due 2050” Due September 30, 2050 Dated as of September 1, 2020 Sixty-Fourth Supplemental Indenture

from 8-K 28 pages Sixty-Third Supplemental Indenture

from 10-K 11 pages Avista Corporation Description of Common Stock (Registered Under Section 12(b) of the Securities Exchange Act of 1934, as Amended)

from 8-K 35 pages Avista Corporation to Citibank, N.A. as Successor Trustee Under Mortgage and Deed of Trust, Dated as of June 1, 1939 Sixty-Second Supplemental Indenture Providing Among Other Things for a Series of Bonds Designated “First Mortgage Bonds, 3.43% Series Due 2049” Due December 1, 2049 Dated as of November 1, 2019 Sixty-Second Supplemental Indenture

from 8-K 32 pages Avista Corporation to Citibank, N.A. as Successor Trustee Under Mortgage and Deed of Trust, Dated as of June 1, 1939 Sixty-First Supplemental Indenture Providing Among Other Things for a Series of Bonds Designated “First Mortgage Bonds, 4.35% Series Due 2048” Due June 1, 2048 Dated as of May 1, 2018 Sixty-First Supplemental Indenture

from 8-K 36 pages Avista Corporation to Citibank, N.A. as Successor Trustee Under Mortgage and Deed of Trust, Dated as of June 1, 1939 Sixtieth Supplemental Indenture Providing Among Other Things for a Series of Bonds Designated “First Mortgage Bonds, 3.91% Series Due 2047” Due December 1, 2047 Dated as of December 1, 2017 Sixtieth Supplemental Indenture

from 8-K 32 pages Avista Corporation to Citibank, N.A. as Successor Trustee Under Mortgage and Deed of Trust, Dated as of June 1, 1939 Fifty-Ninth Supplemental Indenture Providing Among Other Things for a Series of Bonds Designated “First Mortgage Bonds, 3.54% Series Due 2051” Due December 1, 2051 Dated as of December 1, 2016 Fifty-Ninth Supplemental Indenture

from 8-K 35 pages Avista Corporation to Citibank, N.A. as Successor Trustee Under Mortgage and Deed of Trust, Dated as of June 1, 1939 Fifty-Eighth Supplemental Indenture Providing Among Other Things for a Series of Bonds Designated “First Mortgage Bonds, 4.37% Series Due 2045” Due December 1, 2045 Dated as of December 1, 2015 Fifty-Eighth Supplemental Indenture