Image Credit: Tony Marsh Photography

Glenmuckloch Pumped Storage Hydro

Glenmuckloch is a pumped storage hydro project in Dumfries & Galloway, Scotland. It is planned at 210MW and capable of operating at full output for over 8 hours, providing long‑duration storage and grid flexibility to the UK’s electricity markets.

Project milestones

Date

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Date

Late 2028

Final Investment Decision (FID) expected

Subject to regulatory outcomes and funding, the project is expected to reach Final Investment Decision, enabling construction to proceed.

Late 2028

Spring 2029

Grid energisation

A secured grid connection is in place, with energisation targeted for May 2029 as the project prepares to connect to the electricity system.

Spring 2029

Late 2030

Transitioning to Full Operational Capacity

Initial power generation is targeted following construction, marking the transition from development to operational infrastructure.

Late 2030
Late 2028

Late 2028

Final Investment Decision (FID) expected

Subject to regulatory outcomes and funding, the project is expected to reach Final Investment Decision, enabling construction to proceed.

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Spring 2029

Spring 2029

Grid energisation

A secured grid connection is in place, with energisation targeted for May 2029 as the project prepares to connect to the electricity system.

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Late 2030

Late 2030

Transitioning to Full Operational Capacity

Initial power generation is targeted following construction, marking the transition from development to operational infrastructure.

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Where it’s located

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Image of Glenmuckloch site
Location of site.
Where it’s located

A strategic site for flexibility

Southwest Scotland hosts significant operational and consented wind generation which are frequently subjected to operational curtailments due to limited grid transmissions capacity. Major upgrades to transmission infrastructure are planned, with a proposed substation adjacent to the project site, where Glenmuckloch will connect via a twin 132kV circuit.

Image of Glenmuckloch site
Image credit: Tony Marsh Photography
What’s already in place

Advanced development status

Land rights have been secured through a lease agreement with Buccleuch Estates, alongside the granting of planning consent and key licences. A grid connection offer is also in place, with energisation targeted for May 2029.

Image of Glenmuckloch site
Map showcasing the proposed scheme layout.
What’s been approved

Consents and licences

The project has secured a full suite of regulatory approvals under the UK and Scottish planning framework, including a generation licence under Section 6 of the Electricity Act 1989, Section 36 consent with deemed planning permission, an order permitting the acquisition of water rights, and a Controlled Activities Regulations (CAR) licence governing water use and environmental impact.

Image of Glenmuckloch site
Image Credit: Tony Marsh Photography.
Community and engagement

Rewriting an industrial legacy

Glenmuckloch will restore and revitalise a former open-cast coal mine, repurposing existing land to support the energy transition. The project is designed to bring new purpose to a disused site, using above-ground construction and a closed-loop water system to create long-duration storage and grid flexibility.

Latest update

Designed for deliverability

Pre‑construction development is well advanced, with land rights, planning consent and a grid connection offer already secured.

Documents and resources

All planning documentation can be found here

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