Drax is progressing an option to expand its existing Cruachan pumped storage facility in Scotland through the construction of a new 600 MW power station. Built adjacent to the existing underground plant, the new power station would effectively more than double the site’s total generation capacity to more than 1 GW.
Pumped storage plants act like giant water batteries by using reversible turbines to pump water from a lower reservoir to an upper reservoir, which stores excess power from sources such as wind farms when supply outstrips demand. These same turbines are then reversed to bring the stored water back through the plant’s turbines to generate power when the country needs it. This process both strengthens energy security and enables the grid to decarbonise.
COWI and PINI will provide dedicated support through the project’s Front-End Engineering and Design (FEED) phase, with their expertise in pumped storage hydro being used in areas such as civil and marine engineering, geotechnics, mechanical and electrical systems. Both firms have a strong track record in hydro developments around the world.
Steve Marshall, Drax’s Development Manager for the Cruachan Expansion project, said: “We are delighted to welcome two world-leading engineering consultancies to our project, helping us move forward with the new power station’s design.
“A new generation of pumped storage hydro plants will strengthen the UK’s energy security through enabling more homegrown renewable electricity to come online, cutting the need to import power or fossil fuels from abroad.
“Projects such as Drax’s will not only be good for the grid, but it will also offer fantastic opportunities for local communities and businesses. Expanding Cruachan will be a major infrastructure project which will create jobs and provide a real boost to Scotland’s economy.”
During the construction phase, the expansion of Cruachan is expected to support around 1,100 jobs across the UK and contribute a potential £470m to the economy. It would be one of the most significant infrastructure projects in Scotland in a generation.
Andy Sloan, Managing Director, COWI in the UK, said: “COWI is thrilled to support Drax on this vital project and continue to play a key role in the revival of pumped storage in Scotland. This project allows us to apply our expertise in rock mechanics and tunnel engineering to a renewable energy initiative.
“Hydroelectric developments offer tremendous potential for addressing long-term energy storage needs, paving our way to a greener, more sustainable future for generations to come.”
Pierluigi Nionelli, Head of Business Line Hydropower, PINI Group, said: “The expansion of Cruachan will make a crucial contribution to the energy transition process in Scotland. Our Hydropower Business Line is dedicated to developing cutting-edge solutions for the sector on a daily basis.
“We are therefore truly honored to be able to transfer our know-how and skills, developed over the years across Europe, South America, Asia, and Oceania, to a project like Cruachan.”
The appointment of the joint venture comes just a few weeks after the UK Government confirmed it would be moving ahead with a new investment framework to support long duration electricity storage technologies, including pumped storage hydro.
In addition to the proposed construction of a new plant, Drax is currently progressing an £80 million major refurbishment of its existing Cruachan site. The refurbishment will see original parts replaced and the generating capacity of the power station upgraded from 440 MW to 480 MW.
ENDS
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Editor notes
- Drax’s plans to build a new 600 MW pumped storage hydro plant at Cruachan was granted development consent through the Section 36 process from the Scottish Government in July 2023.
- Cruachan was constructed over a six-year period by a large workforce of 1,300 men, affectionately known as the Tunnel Tigers. But before they could build the power station inside the mountain, they had to drill and blast into it. The men used handheld air drills to bore holes in the solid granite rock, which were then packed with gelignite and blasted.
About Drax
Drax’s purpose is to enable a zero carbon, lower cost energy future. Our strategic aims are to be a global leader in both carbon removals and sustainable biomass pellet production, and to be a UK leader in dispatchable, renewable generation.
Our operations
Drax owns and operates a portfolio of flexible, low-carbon and renewable UK power assets – biomass, hydro, and pumped storage generation – which provide dispatchable power and system support services to the electricity grid.
We are the UK’s largest source of renewable power by output, and Drax Power Station is the UK’s largest single source of renewable electricity by output.
Through our pellet production facilities in North America, Drax is the world’s second largest producer of sustainable biomass. Drax has 18 operational and development pellet production sites which will have a nameplate capacity of around 5.4 million tonnes once expansions are complete.
Drax supplies renewable electricity to UK industrial and commercial customers, offering a range of energy-related services including energy optimisation, as well as electric vehicle strategy and management.
Our future
Drax is progressing options for carbon removals using bioenergy with carbon capture and storage (BECCS) technology globally and at our UK biomass power station. We are progressing plans to develop 7 million tonnes of carbon removals through BECCS by 2030.
In 2024, we launched Elimini, a US-based company to lead our global efforts to deliver carbon removals at megaton scale. Elimini’s purpose is to remove carbon for good. To achieve this, it is convening engineers, environmentalists, communities, investors, and innovators to scale the market for carbon removals, with the aspiration of transforming our economies from carbon emitters to carbon removers. For more information, visit elimini.com.
