BLACK HILLS CORP /SD/

Linden R. Evans, age 63, has been President and Chief Executive Officer since 2019. He served as - President and Chief Operating Officer from 2016 to 2018, and President and Chief Operating Officer - Utilities from 2004 to 2015. Mr. Evans served as the Vice President and General Manager of our former communication subsidiary in 2003 and 2004, and Associate Counsel from 2001 to 2003. Mr. Evans has 24 years of experience with the Company. As previously disclosed, Mr. Evans will retire following consummation of the Merger.

Marne M. Jones, age 52, has been Senior Vice President Chief Utility Officer since 2025. She served as Senior Vice President Utilities from 2023 to 2025, Vice President Electric Utilities from 2021 to 2023, Vice President Regulatory and Finance from 2018 to 2021, and Vice President Regulatory from 2016 to 2018. Ms. Jones has a total of 24 years of experience with the Company and has advanced through roles of increasing responsibility in finance, accounting, corporate services, regulatory, and utility operations.

Darren Nakata, age 52, joined the Company as Senior Vice President and Chief Legal Officer, Corporate Secretary and Chief Compliance Officer in October 2025. For the prior two decades Mr. Nakata held various leadership roles at companies and law firms, including NW Natural, a publicly traded natural gas, water, wastewater and renewable energy company, Vestas, a publicly traded global wind energy company, and Cravath, Swaine & Moore, a global law firm. Prior to becoming an attorney, he was an engineering consultant for several years.

Kimberly F. Nooney, age 55, has been Senior Vice President and Chief Financial Officer since 2023. She served as Vice President – Treasurer from 2015 to 2023, and also served as the Corporate Controller from 2018 to 2022. Ms. Nooney has a total of 29 years of experience with the Company across numerous roles within accounting, internal audit, corporate development, accounting systems, treasury, and financial planning and analysis.

Don Redden, age 54, joined the Company as Senior Vice Present and Chief Information and Transformation Officer in July 2025. Prior to joining the Company, Mr. Redden had over 25 years of IT leadership experience, including Vice President of Information Technology at Otter Tail Corporation, a publicly traded utility and diversified operations company, and leadership roles at Crary Industries, Microsoft, and the City of Moorhead.

Sarah A. Wiltse, age 47, has been Senior Vice President and Chief Human Resources Officer since October 2024. Prior to joining the Company, she was Vice President of Human Resources for ACCO Brands, a publicly traded global consumer goods company, from 2021 to October 2024, Director and Vice President Human Resources for Compass Minerals from 2018 to 2021, and held various leadership roles at Union Pacific from 2004 to 2018.