GE Vernova completes high efficiency upgrades at 800MW Coryton Plant
Pamela Largue
Posted on: 12 February 2026
According to GE Vernova, the plant is now delivering up to an additional 85MW, surpassing the expected 77MW, and improved unit efficiency by 2.46%.
GE Vernova has announced the completion of a major outage and the installation of two high efficiency upgrades at InterGen’s 800MW combined cycle Coryton Power Plant in the UK.
The outage included a high efficiency upgrade of Eleven GT26 units, as well as borescope inspections on two generators and steam turbines, valve inspections, and electrical testing of all components.
A team of over 300 experts logged more than 122,000 man-hours of work to complete the project, which resulted in the plant delivering up to an additional 85MW, surpassing the expected 77MW, and improved unit efficiency by 2.46%.
Daniel Fosberg, Managing Director at InterGen, said the team was impressed by results which exceeded expectations and align with their commitment to energy efficiency and flexible generation.
According to GE Vernova, the upgrades will likely support extended maintenance intervals and lead to a reduction of approximately 67,500 tonnes equivalent of carbon emissions each year based on 6,500 operating hours per year.
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Joseph Anis, President & CEO for GE Vernova’s Gas Power business in Europe, Middle East & Africa said: “The scope and nature of this project were extraordinary, demonstrating our capability to deliver high-impact, efficient solutions that not only meet but exceed our clients’ expectations. GE Vernova GT26 gas turbines are able to operate on a variety of fuels, including blends of hydrogen and natural gas, to offer InterGen pathways to reduce carbon emissions in the future.”
GE Vernova has invested heavily in the development of the GT26 HE upgrade, which was originally introduced in 2019.
The GT26 HE combines technology from both the F- and H-Class fleets with additive manufactured parts and innovations in aerodynamics, material science, and combustion dynamics.
Coryton power station is a natural gas-fired CCGT plant located 30 miles east of London on the River Thames, situated next to the London Gateway Port and Logistics park.
The plant recently commissioned a private wire connection to the Port capable of delivering 75MW of power.
The agreement with GE to perform the efficiency upgrade was initially reached in 2023. In January 2024, InterGen applied to the Department for Energy Security and Net Zero to amend Coryton’s existing planning consent to allow an increase in the permitted electrical output of the generating station to up to 850MW.
