Mitie Begins Windyhill Battery Site Construction in Bearsden 2026

Key Points

• Project Groundbreaking: Construction has officially commenced on the Windyhill Battery Energy Storage Site (BESS) located in Bearsden, near Glasgow.
• Energy Capacity: Phase 1 of the development will deliver a capacity of 200 megawatts (MW) / 400 megawatt-hours (MWh), capable of powering up to 55,000 homes for two hours.
• Second Phase Planned: A planned second phase of identical scale will eventually double the site’s total output to 400MW / 800MWh.
• Commercial Operations Timeline: The facility reached financial close in February 2026 and is scheduled to reach full commercial operations by the first quarter of 2028.
• Partnership and Stakeholders: The project is being developed jointly by Mitie Power & Grid and Revera Energy (an infrastructure platform backed by global investment firm Carlyle). GE Vernova serves as the primary technology partner, while Danske Commodities will manage trading and optimisation under a 10-year revenue floor agreement.
• Economic Impact: The construction process is projected to generate approximately 60 local jobs in Bearsden and the surrounding East Dunbartonshire region.
• Grid Bottleneck Relief: Situated north of the UK’s critical B6 transmission boundary, the site will capture excess Scottish wind energy, preventing generator curtailment and stabilizing national power supplies.

Bearsden (Glasgow Express) August 7, 2026 – Construction work has officially commenced on a major utility-scale energy storage development in uk/local/bearsden/">Bearsden, approximately ten kilometres north-west of Glasgow. The Windyhill Battery Energy Storage Site (BESS), developed through a strategic partnership between Mitie Power & Grid and Revera Energy, is designed to store renewable electricity directly from the grid during periods of peak generation and dispatch it when demand surges. Upon completion of its initial phase in early 2028, the £500 million project’s primary facility will feature a 200 megawatt (MW) / 400 megawatt-hour (MWh) storage unit capable of supplying power to approximately 55,000 homes for two consecutive hours. Groundbreaking took place following the execution of final construction agreements and non-recourse senior debt financing arranged earlier this year, establishing the project as one of the largest single-site battery storage installations in Scotland.

What are the key operational specifications of the Windyhill BESS project?

The Windyhill facility is engineered to provide fast-acting frequency response, dynamic balancing, and bulk energy shift services to the National Grid Electricity System Operator. Operating on lithium-ion battery technology, the facility’s first phase delivers 200MW of export capacity and 400MWh of total storage volume. A second phase, designed to replicate the primary infrastructure, is planned for future construction to expand site storage to 400MW / 800MWh.

As reported by Tim McManan-Smith of The Energy St, the ceremonial groundbreaking took place at the Bearsden site following eight months of pre-construction mobilization, transitioning the development from financial close in February 2026 to active civil groundworks.

The initial construction phase is expected to generate roughly 60 specialized technical and civil engineering jobs, providing direct economic stimulus to East Dunbartonshire and the surrounding Greater Glasgow metropolitan area.

Under the engineering and construction framework, Mitie Power & Grid is acting as the principal balance-of-plant (BoP) contractor.

Mitie’s scope of work encompasses civil engineering, electrical engineering, and the design and installation of a dedicated 132kV grid connection infrastructure linking the battery compound to the high-voltage transmission circuit. Mitie will also retain long-term maintenance responsibilities across the lifecycle of the asset once operational.

Who are the corporate and industrial partners delivering the development?

The delivery structure of the Windyhill BESS involves a syndicate of international technology, construction, and financial entities. Revera Energy, an independent global energy infrastructure platform backed by NASDAQ-listed investment firm Carlyle (ticker: CG), is overseeing long-term asset management and construction financing.

According to project documentation detailed by Blackridge Research, energy technology firm GE Vernova has been appointed as the equipment provider, supplying the battery enclosures, power conversion systems, and system-level energy management controls. Specialist contractor OCU is working alongside Mitie to deliver on-site civil works.

Route-to-market trading services, commercial optimisation, and dispatch strategy will be managed by Danske Commodities.

The trading platform has signed a 10-year revenue floor agreement covering the full 200MW capacity, mitigating price volatility exposure in the wholesale electricity market.

Debt financing for the capital expenditure was arranged by Santander Corporate & Investment Banking (CIB), providing non-recourse senior debt facilities.

As reported by legal firm White & Case LLP, who acted as borrower’s counsel for Revera Energy, the debt facility was finalized alongside the issuance of a formal Notice to Proceed to engineering contractors, enabling site clearance and excavation work to commence immediately.

How does the Bearsden battery storage facility interface with the UK national grid?

The primary operational purpose of the Windyhill site is to act as a buffer for electricity generated from renewable energy sources, specifically wind power assets across mainland Scotland and adjacent offshore waters. Due to the intermittent nature of wind patterns, electricity generation frequently spikes during periods when consumer demand is low, such as overnight.

When local generation exceeds national demand or transmission line capacity, the BESS absorbs excess megawatt-hours directly from the 132kV network, storing energy within its lithium-ion modules.

During peak demand windows—typically early morning and evening hours—the battery system reverses flow, discharging stored power back into the network.

This rapid charging and discharging capability also provides system stability services, including dynamic containment and firm frequency response.

These services prevent system frequency from drifting away from the standard 50Hz baseline, mitigating the risk of power fluctuations and blackouts across the high-voltage transmission grid.

Why is the site location in Bearsden critical for relieving Scotland’s energy constraints?

The geographical placement of the Windyhill BESS in Bearsden holds strategic relevance for the wider UK power network due to its position north of the B6 transmission boundary.

The B6 boundary represents the critical electrical transmission bottleneck running across the border region between Scotland and North-East England.

Scotland currently produces a structural surplus of wind power, but physical transmission constraints frequently prevent this electricity from being transferred south to high-demand population centres in England.

As highlighted in technical reports published by Mitie Power & Grid, when transmission lines reach maximum thermal capacity, the National Grid operator must issue “curtailment orders,” paying Scottish wind farm operators to switch off their turbines.

By capturing unutilised wind energy directly north of the B6 bottleneck, the Windyhill facility stores power that would otherwise be curtailed. This reduces constraint payments made to generators, preserves green power within the system, and lowers overall system balancing costs passed through to electricity consumers.

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What is the background to the Windyhill energy storage development?

The initiation of construction at Windyhill marks the first asset within Revera Energy’s broader £500 million Scottish storage platform to move into active build phase. Revera holds an advanced development pipeline of 800MW / 1,600MWh in additional BESS projects across Scotland, all of which possess planning approvals, land rights, grid connection agreements, and 15-year capacity market contracts.

The company plans to mobilize construction across its entire 1,000MW (1 gigawatt) portfolio over the next 12 months.

For Mitie Power & Grid, the Bearsden project represents an extension of its energy infrastructure development footprint. Mitie’s Projects division has previously completed over 40 BESS assets across the United Kingdom, accounting for more than 40 per cent of all operational battery storage facilities currently connected to the UK grid.

The project aligns with wider UK legislative commitments under the Climate Change Act and Net Zero 2030 targets.

As the UK continues to decommission fossil-fueled thermal power stations, system inertia historically provided by spinning turbines has declined. Battery storage assets have consequently emerged as the primary mechanical substitute for maintaining voltage and frequency stability in a grid dominated by weather-dependent renewables.

How will this energy storage development impact Scottish electricity consumers and local communities in the future?

The commercial operationalization of the Windyhill BESS in Q1 2028 is expected to influence local economic conditions, regional grid stability, and consumer utility costs.

For the local community in Bearsden and East Dunbartonshire, the primary short-term impact will be direct employment generation. The creation of roughly 60 jobs during the construction phase will bring specialized engineering contractors, trade personnel, and logistics traffic to the area.

The civil works phase will require local material procurement, site surveying, ground clearance, and foundation installations, benefiting regional supply chain vendors.

For energy consumers across Scotland and the wider UK, the operational impact of large-scale BESS developments relates directly to household electricity bills. Under current grid operations, constraint payments—costs paid to wind farms forced to power down due to network bottlenecks—are funded via network charges applied to consumer bills.

By absorbing excess power and reducing turbine shut-downs, the 200MW / 400MWh capacity of Windyhill helps curb constraint expenditure, contributing to long-term stabilization of wholesale energy tariffs.