Constellation Appoints Alan Armstrong to Board of Directors to Strengthen Energy Leadership
Constellation, a leading integrated energy company dedicated to delivering reliable and clean power to homes and businesses across the United States, has announced the election of Alan S. Armstrong to its board of directors, effective January 1, 2026. Armstrong’s appointment reflects Constellation’s ongoing commitment to bringing experienced leadership to its governance team as it continues to expand and integrate America’s largest natural gas portfolio into its generation fleet through its strategic deal with Calpine.
Armstrong currently serves as executive chairman of the board of directors for Williams, a prominent U.S. energy infrastructure company specializing in natural gas gathering, processing, and transmission. He previously held the position of president and CEO of Williams for 14 years, guiding the company through a period of significant growth, infrastructure expansion, and operational excellence before being named board chair earlier this year.
“Alan brings nearly 40 years of experience at Williams, including more than a decade as CEO, where he led major expansions in energy infrastructure and drove long-term growth and operational excellence,” said Robert J. Lawless, chairman of Constellation. “His deep industry knowledge and proven leadership will be invaluable as we continue integrating Calpine’s assets into Constellation’s generation portfolio, further strengthening our position as a leading provider of clean and reliable energy across the country.”
Armstrong expressed enthusiasm about his new role at Constellation, emphasizing his commitment to advancing the company’s mission. “It’s a privilege to join Constellation’s board and support a company dedicated to delivering reliable, clean energy to millions of homes and businesses,” Armstrong said. “I look forward to contributing my experience in energy infrastructure and operations to help advance Constellation’s goals of enhancing America’s energy security and economic strength.”
Extensive Career at Williams
Armstrong’s career at Williams spans nearly four decades, beginning in 1986 as an engineer, where he gained foundational experience in the company’s operational and commercial units. Over the years, he advanced through a series of leadership roles, demonstrating a strong aptitude for managing complex energy projects and operational teams.
Prior to his tenure as CEO, Armstrong served as Senior Vice President – Midstream, where he led Williams’ North American midstream and olefins businesses through a period of strategic growth and expansion. In this role, he oversaw critical projects that enhanced the company’s infrastructure, streamlined operations, and strengthened market position. His leadership in these areas set the stage for his later success as CEO, where he directed company-wide initiatives focused on long-term growth and sustainability.
As CEO, Armstrong guided Williams through a transformative era, overseeing large-scale expansions in natural gas infrastructure across the United States. His tenure was marked by a focus on operational excellence, safety, and financial performance. He successfully led the company through market fluctuations, regulatory challenges, and technological changes in the energy sector, cementing Williams’ reputation as a leading midstream energy company.
Leadership Beyond Williams
Armstrong is widely recognized as a thought leader in the energy industry. He currently serves as chair of the National Petroleum Council, a key advisory body that provides recommendations to the U.S. government on energy policy, technological innovation, and industry trends. In addition, he is a founding member of Natural Allies for a Clean Energy Future, a coalition focused on advancing environmentally responsible energy development.
Armstrong also contributes his expertise to the financial sector, serving on the board of directors for BOK Financial Corp., where he provides strategic guidance on governance and corporate oversight. His broad experience across energy operations, policy, and finance equips him with a unique perspective that is highly valuable for board-level decision-making at Constellation.
Academic Background and Philanthropy
Armstrong earned a bachelor’s degree in civil engineering from the University of Oklahoma, a credential that underpins his technical expertise in energy infrastructure and operations. Beyond his professional achievements, he is actively engaged in supporting higher education, currently serving as chair of The University of Oklahoma Foundation, which oversees philanthropic efforts that advance the university’s mission and academic initiatives. His involvement in education and community development demonstrates a commitment to nurturing the next generation of engineers, business leaders, and innovators.
Strategic Value to Constellation
Armstrong’s appointment to Constellation’s board is particularly timely as the company continues its integration of Calpine’s extensive natural gas portfolio. The acquisition of Calpine’s assets is poised to enhance Constellation’s generation capabilities, increase operational efficiency, and provide additional flexibility in meeting the growing demand for clean energy. Armstrong’s deep knowledge of natural gas infrastructure, coupled with his leadership experience at Williams, positions him to provide invaluable guidance as Constellation navigates the complex challenges associated with large-scale energy operations and integration.
Robert J. Lawless, chairman of Constellation, emphasized the strategic importance of Armstrong’s addition to the board: “Alan’s insight into energy markets, regulatory frameworks, and infrastructure management will help Constellation optimize its operational performance while advancing its commitment to delivering sustainable, reliable energy. His appointment strengthens our governance and ensures that our board benefits from a breadth of industry expertise and strategic foresight.”
Industry Recognition
Throughout his career, Armstrong has been recognized for his leadership, vision, and contributions to the energy sector. His ability to balance operational efficiency, strategic growth, and long-term sustainability has earned him a reputation as a forward-thinking executive. By bringing this perspective to Constellation, Armstrong will help guide the company through a period of significant growth, technological advancement, and market evolution.
Constellation’s board appointment reflects the company’s commitment to maintaining strong governance and leveraging industry expertise to support its long-term strategy. With Armstrong on board, Constellation is well-positioned to continue delivering on its mission to provide clean, reliable, and economically sustainable energy to millions of customers across the United States.
Armstrong’s expertise in natural gas infrastructure, executive leadership experience, and active involvement in energy policy and philanthropy make him an ideal addition to Constellation’s board. His guidance is expected to play a key role in the company’s ongoing growth, integration of Calpine’s assets, and strategic initiatives aimed at enhancing America’s energy security and supporting economic development.
