ArcLight Capital Partners has signed a definitive agreement to acquire InfraBridge’s 50% stake in Invenergy AMPCI Thermal Power (IATP), a jointly owned power generation portfolio totaling approximately 5.4 gigawatts across North America.
The portfolio consists of 11 power infrastructure assets located in multiple markets, including major combined-cycle plants such as the Grays Harbor Energy Center in Washington, Nelson Energy Center in Illinois, Lackawanna Energy Center in Pennsylvania, and St. Clair Energy Centre in Ontario. The assets are owned in partnership with Invenergy, which will retain its existing ownership stake and continue operating the portfolio following the transaction.
IATP provides contracted power generation capacity across seven markets and represents a large-scale portfolio of natural gas–fired infrastructure assets designed to support grid reliability and electricity supply. Financial terms of the private transaction were not disclosed.
The deal remains subject to customary regulatory approvals and other closing conditions and is expected to close in the second half of 2026.
BofA Securities is serving as financial advisor to InfraBridge, while Morgan Stanley is serving as financial advisor to ArcLight.
InfraBridge is a global infrastructure manager and a division of DigitalBridge Group focused on investments across digital infrastructure, transport, logistics, and the energy transition. ArcLight, founded in 2001, invests in critical electrification infrastructure and has owned, controlled, or operated more than 65 gigawatts of assets and approximately 47,000 miles of electric and gas transmission and storage infrastructure representing about $80 billion in enterprise value.
KEY QUOTES:
“This transaction reflects InfraBridge’s disciplined investment approach and our continued focus on delivering strong outcomes for our investors. We are proud of our longstanding partnership with Invenergy and the performance of the IATP portfolio. ArcLight brings deep experience across North American power markets, and we are confident the business is well-positioned for its next phase of ownership.”
Sadiq Malik, Managing Director, DigitalBridge and Co-Head of InfraBridge
“IATP is a unique, diversified, large scale portfolio of contracted power infrastructure assets which provides significant, low cost power across seven markets. We look forward to working with Invenergy, to help drive value from the portfolio and continue to provide grid reliability and resources.”
Andrew Brannan, Managing Director At ArcLight
“We believe that strategic power portfolios like IATP, which provide significant capacity, reliability and grid infrastructure across North America, will play an increasingly critical role in helping to meet the power demand needs driven by AI and electrification.”
Angelo Acconcia, President Of ArcLight
