Field powers up largest battery site to date, boosting energy security and lowering costs

New 50MW/100MWh Auchteraw site to provide flexibility and cut constraint costs

• Auchteraw battery site, Field’s fourth and largest, is now fully energised and in operation
• The 50MW / 100MWh site near Fort Augustus in Scotland is the UK’s most northerly battery asset and will provide essential flexibility services, whilst addressing significant constraint costs in the region
• The site has the capacity to store enough energy to supply up to 150,000 homes for two hours
• This is the latest milestone for Field after construction began on Holmston recently, at Drum Farm this week, and with planning permission recently granted in Yaxley, Suffolk

Field’s 50MW/100MWh Auchteraw battery storage site – Field’s biggest yet – is now live, with the capacity to store enough energy to supply up to 150,000 homes for two hours when fully charged. Located near Fort Augustus in Scotland, Auchteraw will help reduce grid constraint costs and maximise use of renewable energy.

This milestone marks the fourth Field site to enter into operation and marks a significant step forward in delivering the company’s 4.5GWh pipeline of projects across Great Britain. This is the first of Field’s Scottish sites to become fully operational, and comes as Field ramps up development and delivery. This follows construction beginning earlier this year at Holmston, in South Ayrshire, and begins at Drum Farm near Keith this week. Field has also recently had planning approval for a 200MW scheme granted for a brownfield site at Yaxley, Suffolk, on an ex-RAF base.

Located in close proximity to Fort Augustus, Auchteraw’s location north of the heavily constrained B4 transmission boundary across the Scottish Central Belt makes it critical for reducing soaring constraint costs. National Energy System Operator data shows constraint costs reached over £1.7 billion in 2024 [1] and were close to £1 billion in the first half of 2025 alone, with constraint payments in Northern Scotland forecast at £117 million over the same period. These costs are expected to keep rising to 2030, especially as more renewable generation comes online in Northern Scotland [2]. The announcement that Auchteraw is operational, combined with Field’s pipeline of activity, will therefore help lower bills and ensure renewable power is stored and used, instead of wasted.

Construction of the site was delivered by Powersystems, with Field’s experienced team overseeing the project. RJ McLeod, who are now owned by OCU Group, delivered the engineering and infrastructure works for the project.

Amit Gudka, CEO of Field, said: “Bringing Auchteraw online is a major milestone for Field as our largest site yet and first in Scotland. This will make a real difference for bill payers by reducing constraint costs and ensuring more of Scotland’s valuable renewable energy can be used.

Every new site we deliver strengthens the UK’s energy security and makes the grid cleaner, cheaper, and more flexible. Auchteraw is proof of the momentum we’ve built, moving rapidly from planning to construction to operation.

But there’s still much more to do - battery storage is essential if we’re to unlock the full potential of the energy system.”

[1] National Energy System Operator, Constraint Breakdown Costs and Volume dataset

[2] National Energy System Operator, 2025 Annual Balancing Costs Report, P. 31

Notes to editors

• Field develops, builds and operates the renewable energy infrastructure we need to reach net zero in the UK and Europe — starting with battery storage. Our battery storage sites provide clean energy when and where it’s needed most. This creates a more reliable, flexible and greener energy system that provides greater energy security and helps countries across Europe move on from expensive fossil fuels.

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