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    Mitie, Revera 400MWh BESS at Windyhill: grid stability lens for engineers

    August 10, 2026|

    Reviewed by Tom Sullivan

    Mitie, Revera 400MWh BESS at Windyhill: grid stability lens for engineers

    First reported on The Construction Index

    30 Second Briefing

    Mitie Power & Grid and Carlyle-backed Revera Energy have broken ground on the Windyhill Battery Energy Storage Site near Glasgow, a 400MWh grid-scale BESS designed to supply 50,000 homes for two hours in its first phase. A second phase of equal 400MWh capacity is planned, taking the total to 800MWh and positioning the site as a major stabilising asset for Scotland’s transmission network. Grid engineers can expect significant implications for peak-shaving, frequency response and integration of intermittent wind generation in the central belt.

    Technical Brief

    • Windyhill BESS is being delivered by Mitie Power & Grid with Carlyle-backed Revera Energy as partner.
    • Grid-connection works and civil enabling works will be critical early packages following ground-breaking.
    • Phased build-out allows staged commissioning, reducing initial grid-integration and protection-system complexity.
    • Battery configuration and inverter sizing will dictate available ancillary services beyond simple energy arbitrage.

    Our Take

    Carlyle’s presence alongside Mitie Power & Grid and Revera Energy suggests that institutional capital is now comfortable with UK BESS as an infrastructure-style play rather than a pure merchant bet, which typically improves bankability for follow‑on phases beyond the initial 400 MWh.

    For operators around Glasgow, a project at this storage scale is likely to materially affect local grid flexibility and constraint management, which can in turn change the economics of nearby renewables projects that are currently curtailed or facing limited connection capacity.

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    Prepared by collating external sources, AI-assisted tools, and Geomechanics.io’s proprietary mining database, then reviewed for technical accuracy & edited by our geotechnical team.

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