SSE Renewables kicking off ‘largest under-construction BESS’ in UK at 640MWh

LinkedIn
Twitter
Reddit
Facebook
Email

The renewable energy IPP arm of UK utility SSE is to start building a 320MW/640MWh battery energy storage system (BESS), which could be the largest under-construction in the country.

The company has taken a final investment decision (FiD) on the Monk Fryston project in Yorkshire, north England, and will now proceed with construction, it said yesterday (1 November). The project is located next to a substation operated by UK transmission system operator (TSO) National Grid in the village of Monk Fryston.

“It’s fantastic that we have taken a Final Investment Decision on the Monk Fryston BESS project, one of the largest battery storage projects in the UK,” said Richard Cave-Bigley, solar and battery director for SSE Renewables.

The project is the largest BESS in the UK to enter the construction stage that Energy-Storage.news is aware of, and a senior director at another UK developer agreed with this.

This article requires Premium SubscriptionBasic (FREE) Subscription

Try Premium for just $1

  • Full premium access for the first month at only $1
  • Converts to an annual rate after 30 days unless cancelled
  • Cancel anytime during the trial period

Premium Benefits

  • Expert industry analysis and interviews
  • Digital access to PV Tech Power journal
  • Exclusive event discounts

Or get the full Premium subscription right away

Or continue reading this article for free

Larger projects, such as an 800MWh system from Innova and a 2,080MWh project from Carlton Power have secured planning permission so are free to start building, but neither has announced the start of construction with potential additional steps such as FiD still to be completed.

It is SSE Renewables’ third BESS project to reach the construction stage. Last month saw BESS units from system integrator Wärtsilä arrive on-site at the 50MW Salisbury project while construction started on the 150MW Ferrybridge project in August.

Energy-Storage.news has asked SSE Renewables to comment and will update this article when a response is received.

The UK energy storage market is among the most mature markets in the world along with select US states like California and Texas, with over 3GW of BESS online. Most projects being developed or built today have moved to 2-hour durations as ancillary service markets saturate requiring more energy-intensive activities to make up the shortfall due to falling ancillary service prices.

Energy-Storage.news’ publisher Solar Media will host the 9th annual Energy Storage Summit EU in London, 21-22 February 2024. This year it is moving to a larger venue, bringing together Europe’s leading investors, policymakers, developers, utilities, energy buyers and service providers all in one place. Visit the official site for more info.

13 October 2026
London, UK
Now in its second edition, the Summit provides a dedicated platform for UK & Ireland’s BESS community to share practical insights on performance, degradation, safety, market design and optimisation strategies. As storage deployment accelerates towards 2030 targets, attendees gain the tools needed to enhance returns and operate resilient, efficient assets.

Read Next

July 2, 2026
A roundup of recent large-scale BESS activity in the UK, with IPPs ContourGlobal, Zenobē and Revera buying or taking FID on three separate projects totalling 3.6GWh of capacity.
July 1, 2026
A lot of work and thought still needs to go into maximising the potential for co-location of solar and BESS technology, panellists at the Clean Power 2030 Summit said yesterday (30 June).
July 1, 2026
Wärtsilä has brought the 150MW/300MWh Bungama BESS online in South Australia, for owner and operator Revera Energy.
June 30, 2026
Spanish utility Iberdrola’s subsidiary Avangrid has announced plans to construct a 41MW/82MWh BESS facility in Gilliam County, Oregon.
June 26, 2026
UK energy regulator Ofgem has shortlisted 16 projects for the first ever long-duration energy storage (LDES) cap-and-floor scheme, totalling 7.6GW of capacity ranging from 8- to 22-hour durations.