| Carbon capture and sequestration Combined cycle shaft line, as employed in NZT Power. Image: GE Vernova
launcher/receiver will be completed by Maraen Fabrication (previously Global Energy (Group)) at the Port of Nigg, drawing on its experience delivering complex subsea and topside structures. Also involved are offshore specialists HR Wallingford, Orbis Energy, GEOxyz UK, Heli Robotics Solutions, Marine Environmental Solutions, and Risktec Solutions.
● Alcatel Submarine Networks, which is delivering the project’s power and communications cable. It has awarded sub- contracts to offshore specialists, including Cathie Associates, EGS and Safelane.
● Sarens, provider of UK heavy lift and self- propelled modular transporter services.
● Heidelberg, supplier of low carbon concrete. ● Peerless, a CECO Environmental Brand,
supplier of cooling tower side-stream filters, gas/liquid filters, and coalescers.
Designing NZT Power
The final client for NZT Power is the NZT Power JV, currently a joint venture of bp and Equinor.
Appropriately enough, the NZT Power project was the topic of an opening keynote address by Terry Raddings (GE Vernova) and Steven Langley (Technip Energies) at the IMechE Steam Turbine and Generator User Group 2026 conference, Manchester, UK, 10-11 March. NZT Power, along with other CCUS projects, is classified as ‘Track 1’, with a total of £22 billion of public money available. “We’ve got the government funding to get this thing off the ground,” they said. They explained how the power plant design process has been focused on minimising capex, with power output and efficiency as high as possible, “in the high 50s” after allowing for capture, EGR, etc. So, for example, side air intake keeps the centreline profile down, reducing costs. Similarly, side LP exhaust enables ground level condenser connections, also contributing to reduced plant height and lower overall power plant costs. In addition, the power plant must also be able to operate flexibly, an essential “requirement of the modern grid”, and
incorporates an SSS clutch connected to the steam turbine.
A lot of attention is being paid to optimal steam integration, for example making use of steam produced in the HRSG, while the use of exhaust gas recirculation increases the carbon dioxide concentration from 4% to 8%, facilitating capture.
It is estimated that optimal integration of combined cycle with carbon capture can reduce CCGT capex by up to 20% and improve efficiency by up to 5 percentage points relative to a bolt-on capture scheme.
Among distinguishing features of the NZT Power project mentioned by Terry Raddings and Steven Langley are its scale and complexity, being one of the largest recent non-utility projects in the UK, with a large and diverse supply chain. It is also highly innovative. As well as aiming to be the world’s first fully integrated combined cycle and CCS facility, it is also required to be highly dispatchable and flexible. “The power plant is going to ramp up and down and the capture unit must match that while maintaining the capture rate.”
Visualisation of NZT Power. Image: Technip Energies
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