Statkraft Coylton Battery Park Grows to 150 MW With Fresh Consent

Statkraft has secured planning consent for an additional 100MW of battery energy storage at its Coylton Greener Grid Park in East Ayrshire, Scotland. The second phase sits entirely inside the existing site boundary and lifts total capacity to 150 MW. The first 50 MW phase is already in the final stages of commissioning.

The Norwegian state-owned renewable generator will use the expanded park to charge batteries when renewable output runs high and discharge them when the grid needs support. Grid-forming converters keep the units locked in a mode that steadies voltage and frequency, services once supplied mainly by spinning gas and coal plants.

Consent Lifts Coylton to 150 MW Total

East Ayrshire’s Coylton site sits next to the existing electricity substation off the A70. Statkraft received unanimous local consent for the original 50 MW Battery Energy Storage System in February 2024. Construction began in August 2024. The company now expects that phase to finish and begin storing energy toward the end of 2026.

The fresh consent, announced in mid-August 2026 after a Section 36 application to the Scottish Government’s Energy Consents Unit, adds the second 100 MW tranche without any land take beyond the current footprint. Visual appearance stays nearly identical to the consented first phase.

• First phase: 50 MW BESS, construction complete late 2026
• Second phase: additional 100 MW, same site, newly consented
• Combined: 150 MW total energy storage capacity
• Tech core: batteries plus grid-forming converters always in grid-forming mode

Sarah Tullie, Statkraft’s Greener Grid Parks Project Manager, said the expansion supports a more flexible network and further growth of wind and solar. “More home-grown power on Great Britain’s grid network will help achieve greater energy security, keeping bills stable for consumers and businesses, and reducing our reliance on expensive and volatile overseas gas supplies,” she said.

Grid-Forming Converters Steady the System

Conventional power stations deliver inertia and short-circuit level as a byproduct of their heavy rotating machinery. As those plants run less often, the National Energy System Operator needs alternatives. Grid-forming batteries set their own frequency and voltage rather than simply following the grid. They resist changes and can mimic traditional generators through control systems.

At Coylton the converters stay in grid-forming mode continuously. That standing capability supplies stability services even when the batteries are not actively charging or discharging. NESO has already brought the first Grid Forming Battery site in Scotland into service under earlier pathfinder contracts. Those contracts, worth £323 million overall, secured substantial short-circuit level and inertia while targeting roughly £500 million in cost-saving benefits over ten years.

Securing consent to expand our pioneering Coylton Greener Grid Park scheme will bring significant benefits, by supporting a more flexible electricity network, and allowing the further expansion of renewables like wind and solar schemes.

Tullie made the comments in the company’s project update after the consent decision. The same logic underpins the whole Greener Grid Parks concept: small clusters of buildings near substations that raise the volume of renewable electricity the network can carry safely.

Statkraft’s Network of Parks Across Britain

Coylton is one piece of a wider programme. Statkraft already operates two fully commissioned Greener Grid Parks: Keith in north-east Scotland and Lister Drive in Liverpool. Further sites in Scotland and northern England sit in the final stages of commissioning. Construction continues on projects in Norfolk and Wales.

The Greener Grid Parks portfolio across Great Britain follows the same design language: compact, substation-adjacent, focused on stability and renewable integration rather than pure energy arbitrage. Neilston recently received Section 36 approval to grow far beyond its initial 50 MW, showing the company’s appetite for scaling proven sites.

East Ayrshire Neighbours and the Community Fund

The development sits near Drongan and Ochiltree. Statkraft runs an annual Drongan and Ochiltree Green Community Fund of £20,000 for energy-efficiency and environmental projects within 5 km of the site (postcode KA6 6NF). GrantScape administers the fund independently. Recent awards have backed STEM education and local sustainability work.

Construction traffic management, temporary speed limits and environmental clerk-of-works supervision formed part of the build phase. The company held public exhibitions in 2024 ahead of the capacity-increase application and reported no consultee objections on the original consent.

How the Site Grew from 20 MW Ambitions

1. August 2022: Earlier consent secured for a smaller scheme on the land south of Ayr Road.
2. 2023: New planning application lodged to raise capacity, refine layout and drop synchronous compensators.
3. 16 February 2024: Unanimous East Ayrshire Council approval for 50 MW BESS (ref 23/0580/PP).
4. August 2024: Main construction starts after pre-enabling works.
5. September 2024: Public exhibition on plans for further capacity increase.
6. June 2025: Section 36 application submitted to Energy Consents Unit for operating capacity above 50 MW.
7. 11 August 2026: Consent granted for the additional 100 MW phase inside the existing boundary.

Each step kept the physical footprint tight. The second phase re-uses the same design language so local visual impact stays constant even as storage power triples from the original 50 MW.

Stability Services Free Up More Renewables

Every extra megawatt of reliable grid-forming capacity reduces the hours that fossil plant must stay online purely for inertia or voltage support. Batteries can also soak up surplus wind and solar that would otherwise be turned down. That combination cuts curtailment and trims the need for imported gas at peak times.

Scotland already hosts a growing pipeline of onshore wind. Recent approvals include the 75 MW Scottish wind path cleared by TagEnergy and EDF’s 91.8 MW Dunside wind farm approval. Storage parks like Coylton give those turbines a clearer route to market by firming the network around them.

Observers following UK storage note that grid-forming inverters, falling battery costs and complementary pumped-hydro projects form a practical package for a high-renewables system. Coylton’s expansion fits that pattern without requiring new greenfield land.

Frequently Asked Questions

What is the total battery capacity planned at Coylton Greener Grid Park?

Once both phases are complete the site will hold 150 MW of battery energy storage: the original 50 MW now finishing commissioning plus the newly consented 100 MW second phase, all inside the same boundary next to the Coylton substation.

How do the grid-forming converters at Coylton work?

They remain continuously in grid-forming mode so the batteries can set frequency and voltage themselves, resisting network disturbances and supplying inertia-like and short-circuit services that traditional rotating generators once provided as a side effect of generating power.

Which other Greener Grid Parks does Statkraft already operate?

Keith Greener Grid Park in Moray, Scotland, has run since 2022 and Lister Drive in Liverpool has run since March 2023; additional parks in Scotland, northern England, Norfolk and Wales are either commissioning or under construction.

Does the Coylton project include local community funding?

Yes. Statkraft provides £20,000 each year through the Drongan and Ochiltree Green Community Fund for energy-efficiency and environmental projects located within 5 km of the site; GrantScape administers applications independently.

The second phase now has its planning paper. Construction timing will follow commercial and grid-connection decisions, but the physical slot is reserved and the technology path is already proven on the first 50 MW.