MDU Resources Group Expands Board with New Appointments, Enhancing Strategic Growth in Natural Gas Infrastructure

MDU Resources Group has expanded its board to nine members with the appointment of Charles M. Kelley and Tammy J. Miller as independent directors. Kelley has extensive experience in the natural gas industry, while Miller is a former North Dakota lieutenant governor and business leader. Their appointments are expected to enhance MDU's strategic growth in natural gas infrastructure.

BISMARCK, N.D., Aug. 13, 2025 /PRNewswire/ -- MDU Resources Group, Inc. (NYSE: MDU) has expanded its board to nine members with the appointment of Charles M. Kelley and Tammy J. Miller as independent directors. This move is expected to bolster MDU's strategic growth in natural gas infrastructure.

Charles M. Kelley brings over four decades of experience in the natural gas industry, including a distinguished 25-year career at ONEOK, Inc. where he served as senior vice president of Natural Gas Pipelines. At ONEOK, Kelley led strategic growth initiatives and commercial activities, overseeing more than $600 million in capital projects and significantly increasing EBITDA. His deep expertise in pipeline development, regulatory strategy, and capital planning is expected to provide valuable insights as MDU Resources' pipeline subsidiary, WBI Energy, continues to pursue growth opportunities in natural gas transmission and storage. Kelley commented, "I'm honored to join MDU Resources' board and contribute to the projected growth of its natural gas infrastructure. I look forward to supporting the company's efforts to deliver safe, reliable energy to its customers."

Tammy J. Miller, a former lieutenant governor of North Dakota, offers a strong combination of executive leadership and public service. She is the former CEO and board chair of Border States, a North Dakota-based electrical distribution company that grew from $485 million to nearly $2.5 billion in annual sales during her tenure. Miller's experience aligns well with MDU Resources' mission and geographic footprint. She currently serves on the board of directors of SkyWater Technology, a publicly traded company, and brings valuable perspectives on public policy, finance, and corporate governance. Miller commented, "It's a privilege to serve on the board of a company rooted in North Dakota. I'm excited to help MDU Resources' mission through my experience in both business and public service."

Both new directors will serve on the Audit Committee in addition to their general board responsibilities. Darrel Anderson, chair of the board, stated, "We're pleased to welcome Chuck and Tammy to the MDU Resources board. We expect Chuck's extensive pipeline experience will be a strong asset to our natural gas transmission business, and Tammy's leadership in both business and government will bring valuable insight as we continue to grow and serve our communities. We look forward to the contributions they will make to our board and our company."

MDU Resources Group Inc., a member of the S&P SmallCap 600 index, strives to deliver safe, reliable, affordable, and environmentally responsible electric utility and natural gas distribution services to more than 1.2 million customers across the Pacific Northwest and Midwest. The company's pipeline business operates a more than 3,800-mile natural gas pipeline network and storage system, ensuring reliable energy delivery across the Northern Plains.

References:
[1] https://www.marketscreener.com/news/mdu-resources-announces-appointments-to-the-board-of-directors-ce7c51d8d88af021
[2] https://www.prnewswire.com/news-releases/mdu-resources-announces-appointments-to-the-board-of-directors-302529088.html