An Aberdeenshire electricity substation is playing a vital role in enhancing the stability of the electricity grid, marking a significant step forward in the transition to a cleaner energy future.

The energisation of a synchronous condenser at SSEN Transmission's Rothienorman substation has introduced a crucial source of grid stability, historically provided by fossil fuel sources. This innovation is vital as the UK increases its reliance on renewable energy sources like wind and solar power, which do not naturally provide the same level of grid stability.

The synchronous condenser, developed by Quinbrook Infrastructure Partners in partnership with Welsh Power, acts as a physical stabiliser, automatically compensating for sudden short-term changes in the electricity system.

This project is part of the National Electricity System Operator's (NESO) Stability Pathfinder programme, which aims to generate inertia and short-circuit power to the grid without relying on fossil fuels.


The Rothienorman project is one of the first to utilise "grid forming" technology in Scotland. Grid forming technology enables energy sources like solar, wind, and batteries to provide voltage and frequency support to the grid, a crucial step in decarbonising the power supply and ensuring a reliable and stable energy system for the future.

Oliver Driscoll, Head of Customer Experience for SSEN Transmission, said: "The energisation of Quinbrook/Welsh Power's synchronous condenser at our Rothienorman substation marks a milestone in work to create a secure and reliable electricity network for net zero, reducing our reliance on fossil fuel sources to provide grid stability.

"Delivering these connections is not straightforward, and the cutting-edge nature of the Rothienorman project presented challenges that will prove to be invaluable in informing our approach to future projects.

"I'd like to thank all the teams involved for their skill and perseverance over the duration of this highly complex project."

Gareth Rees, Head of Project Delivery at Welsh Power, said: "I'm very proud of the whole team to have delivered this state-of-the-art facility and its challenging connection to SSEN's transmission network, and to be the first operational synchronous condenser under NESO's Pathfinder round II. 

"Now operational, it will provide much needed grid stability services to the network, facilitate the deployment of more renewable energy projects, and ultimately save the consumer money."