Field has broken ground on its Holmston battery storage project in South Ayrshire, with construction on a second Scottish site at Drum Farm near Keith due to begin in early autumn.
Each project will deliver 50MW/100MWh of storage capacity, with Holmston scheduled to complete in the first half of 2026 and Drum Farm due online by the end of next year.
Powersystems is leading construction at Holmston, while Clarke Energy has been appointed to deliver work at Drum Farm. Envision Energy will supply the battery systems for both sites.
Both sites are located north of the B6 transmission boundary between England and Scotland, a region known for high constraint costs.
National Energy System Operator data showed constraint costs reached over £1.7bn in 2024 and nearly £1bn in the first half of 2025. Field said its projects can reduce these costs and prevent curtailment of wind generation.
The batteries are backed by a £42m senior non-recourse loan from Rabobank and ING. Field will operate them using its in-house optimisation platform Gaia to participate in wholesale and balancing markets.
Field chief executive Amit Gudka said: “Getting shovels in the ground at Holmston – and soon at Drum Farm – is another big step forward for Field as we work to accelerate the transition to a secure, cleaner energy system in Scotland and across the UK.”
He added: “Built in strategic locations to support the grid, battery storage can make a difference to bill payers by reducing constraint costs and helping run the energy system in a more efficient and flexible way.”
Field’s 3.5GW pipeline spans multiple sites across Great Britain.
The company said battery storage will remain essential to achieving UK clean power goals by helping balance intermittent renewables while offering a compact, low-impact footprint.