Synchronous condenser has been built by RWE at its existing Pembroke power station site
The first in a new wave of clean grid technology is to start spinning in Pembroke this week, as the National Energy System Operator (NESO) helps keep Britain’s electricity system stable as it moves towards a renewables-led energy system.
The synchronous condenser, built by RWE at its existing Pembroke power station site, is a large rotating machine that provides clean inertia.
Inertia is a key characteristic of the electricity system that helps resist sudden changes in frequency following unexpected disturbances. It acts as a natural shock absorber, helping to maintain a stable and secure flow of electricity to homes and businesses.
Historically these services were provided by large spinning generators at coal, gas and nuclear power stations.
The project in Pembroke is the first of a new wave of 16 synchronous condensers under NESO’s Stability Pathfinder programme, delivering new ways to keep the electricity system reliable as more wind and solar power comes online.
The stability technologies will help cut emissions, strengthen energy security, and save consumers up to £9bn in system costs over the years ahead.
Director of Engineering at NESO, Matt Magill, said: “Projects like Pembroke will help reduce emissions, strengthen energy security, and save consumers up to £9bn as Britain moves towards a clean power system.
“Through our world-leading Stability Pathfinder programme, NESO has pioneered new markets for technologies such as synchronous condensers and Britain’s first grid-forming batteries. Together, they are helping replace services traditionally provided by fossil fuel power stations, while maintaining one of the world’s most secure and reliable electricity systems.”
This is the fourth synchronous condenser to go live in Wales and the first to be built by RWE at its Pembroke Net Zero Centre. The location brings together battery storage, carbon capture, and green hydrogen projects on the site of its gas-fired power station.
Chief Executive Officer of RWE Generation SE, Nikolaus Valerius, said: “The successful commissioning of our new synchronous condenser at Pembroke is an important milestone for the project and for the wider electricity system.
“As more renewable generation connects to the grid, technologies like this will play an increasingly important role in maintaining a secure and reliable electricity network, supporting the Government’s ambition to deliver a clean power system while strengthening resilience.”
The programme currently provides 17.2 GVAs (gigavolt-ampere seconds) of inertia to Britain’s electricity network. The next phase will add a further 26.9 GVAs, more than doubling the amount of clean stability available on the system.










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