ArcLight Capital Partners has signed an agreement to acquire InfraBridge’s 50% stake in Invenergy AMPCI Thermal Power (IATP), a North American power generation portfolio of 5.4GW.

Invenergy will continue to hold its ownership interest and manage operations of the assets following completion of the transaction.

The IATP portfolio comprises 11 power infrastructure assets.

Facilities in the portfolio include combined cycle plants such as the Grays Harbor Energy Centre in Washington, Lackawanna Energy Centre in Pennsylvania, Nelson Energy Centre in Illinois and St. Clair Energy Centre in Ontario. Invenergy remains a co-owner and operator of these sites.

InfraBridge co-head Sadiq Malik said: “This transaction reflects InfraBridge’s disciplined investment approach and our continued focus on delivering strong outcomes for our investors.

“We are proud of our long-standing 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.”

Neither InfraBridge, which operates as part of DigitalBridge Group, nor ArcLight have not disclosed the financial details regarding the private deal.

Completion of the acquisition is subject to regulatory approvals and standard closing requirements.

ArcLight managing director Andrew Brannan said: “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.”

The companies expect to complete the transaction in the second half of 2026.

BofA Securities and Morgan Stanley & Co. are serving as financial advisors to InfraBridge and ArcLight, respectively, on the deal.