Field has energised its 50MW/100MW Auchteraw battery storage site near Fort Augustus in Scotland, its largest project to date.
The facility has the capacity to store enough energy to supply up to 150,000 homes for two hours when fully charged.
Auchteraw is Field’s first operational Scottish site and the UK’s most northerly battery asset.
It will provide critical flexibility services while reducing grid constraint costs, which reached £1.7bn in 2024 and nearly £1bn in the first half of 2025, according to National Energy System Operator data.
The site was delivered by Powersystems with engineering and infrastructure works by RJ McLeod, now owned by OCU Group.
Field said Auchteraw is the fourth site it has brought online as part of a 4.5GW pipeline of projects across Great Britain.
Other developments include Holmston in South Ayrshire, Drum Farm near Keith, and a recently consented 200MW scheme at Yaxley in Suffolk.
Field chief executive Amit Gudka 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.”