PowerTransitions Buys 1.24GW Roseton Gas Plant from Castleton Commodities, Extends New York Portfolio to 1.5GW
The Houston-based IPP now holds more than 1.5 GW of New York gas capacity after two acquisitions in three months, backed by Partners Group targeting constrained U.S. power markets.
PowerTransitions completed its purchase of the 1,242-megawatt Roseton Generating Facility in Newburgh, New York from a subsidiary of Castleton Commodities International on Wednesday (2026-09-09), extending a buying campaign that began with a 323-MW, five-plant portfolio announced in June 2026.5
The Roseton plant has dispatched power into NYISO Zone G since 1974. Gas- and oil-fired, it sits in a constrained downstate zone where capacity payments and ancillary services revenue can outweigh energy margin — NYMEX Henry Hub front-month gas was $2.79/MMBtu on Thursday (2026-09-10), a price that compresses spark spreads on aging equipment.5,4
FERC cleared the transaction on Thursday (2026-08-13), according to the commission's decision. The deal closed within a month of that regulatory approval.4
The June 2026 portfolio — PowerTransitions' first assets in New York — also consists of gas-fired plants that have supplied NYISO for decades, according to the company. Combined with Roseton, PowerTransitions now controls more than 1.5 GW of gas generation in New York.5,4
"The agreement to acquire Roseton is a transformative step for PowerTransitions and a natural complement to the 323 MW New York portfolio announced in June," said co-founder and chief executive Sean Long.5
Partners Group, the Swiss private equity firm that acquired PowerTransitions from EnCap Investments last year and committed more than $450 million to the platform, is funding the expansion. PowerTransitions says it has identified more than 5 GW of thermal power assets for potential acquisition in constrained U.S. markets and carries a 3.5+ GW development pipeline. New York, where downstate transmission constraints have historically produced elevated capacity prices in zones like Zone G, fits that mandate.5
NYISO's hourly system peak last summer reached 31,857 MW on June 24, 2025, at 7 PM, according to EIA data; the all-time system record of 33,956 MW was set in July 2013. New York has added import capacity this year: the 1.25-GW Champlain Hudson Power Express high-voltage direct current line is now operational and expected to carry up to 10.4 TWh of electricity annually into New York City, roughly 20% of the city's needs. On July 3, 2026, NYISO imported 52 GWh from Canada, the most since January 2025, EIA reported. The 100-mile Smart Path Connect transmission project has also been energized. New import capacity eases peak stress without retiring the dispatch role of gas generation physically interconnected within a constrained load zone.3,1,2
PowerTransitions is simultaneously building a data center business. The company expects to invest $2.4 billion in a Kansas campus, with 100 MW of critical IT power targeted by mid-2027 and a further 100 MW by mid-2029, citing on-site access to an existing 161 kV switchyard and ample water supply. A 1,242-MW plant on the Hudson River with a Zone G interconnect is the kind of asset that invites a similar repurposing conversation.5
Plants dispatching since 1974 require sustained capital to stay grid-ready, and New York's decarbonization targets create mounting policy risk for long-dated gas revenue. The Partners Group commitment provides runway, not an open-ended guarantee. When PowerTransitions discloses its first capacity contract, repowering plan, or data center partnership for the New York fleet, that will show whether Roseton was acquired for its megawatts or for what can be built around them.5,4