RWE has taken a final investment decision on its largest UK storage project, the Pembroke Battery Storage facility, representing a circa GBP 200 million development in South Wales. The company, which describes itself as the UK's leading electricity generator and the largest power producer in Wales, announced the project will play an important role in the operation of the Pembroke Net Zero Centre decarbonisation hub.

The project's construction was announced by the First Minister for Wales, Eluned Morgan, at the Wales Investment Summit, underscoring the Welsh Government's commitment to attracting major infrastructure investment to support the nation's clean energy transition.

Technical Specifications and Capacity

The Pembroke Battery Storage facility will feature a two-hour storage system with 350 MW peak output and 700 MWh storage capacity. The storage system will be located on a 5.1-hectare area to the south of RWE's Pembroke Power Station and comprises 212 lithium-ion battery containers.

Once constructed and fully operational, the battery could continually discharge up to 350 megawatts (MW) of electricity directly into the grid for two hours. This equals 700 megawatt-hours (MWh) of stored energy, or equal to keeping the lights on for two hours for almost 300,000 typical UK homes.

Project Timeline and Regulatory Approvals

The RWE Pembroke Battery project received planning consent in January 2025 and was successful in the UK's latest Capacity Market auction, securing a critical route to market. Construction will start in the first half of 2026, with commissioning and operations expected in the second half of 2028, subject to receiving an updated and timely grid connection.

The project has secured planning consent and a route to market through the UK Capacity Market auction, providing the regulatory foundation for the development to proceed.

Environmental and Community Impact

To operate the plant in harmony with the local ecosystem, part of the Pembroke Battery project will involve implementing biodiversity measures in the areas surrounding the operational power station site. These measures include meadow planting, native woodland and scrub planting, and developing a new large pond to support local wildlife.

First Minister for Wales, Eluned Morgan, stated: "This significant investment by RWE demonstrates Wales' central role in the UK's transition to clean and renewable electricity. The Pembroke Battery Storage facility will support our ambitions for a cleaner, more secure energy future while at the same time creating opportunities for good jobs and local communities across South Wales."

She added: "Innovative projects like this showcase how Wales is leading the way in the development of renewable energy technology. This is helping to build a greener economy for generations to come."

Strategic Importance and Grid Stability

Nikolaus Valerius, CEO of RWE Generation SE, explained: "In a dynamic energy world with more and more renewable energy, there is an increasing need for mature technologies that can instantly support the electricity grid. Battery storage systems are ideal for this because they are fast, efficient, and competitive. Our Pembroke Battery is our UK flagship storage project and will make an important contribution to stabilising the UK energy market by efficiently storing surplus energy and feeding it into the national grid in a targeted manner when required."

Battery energy storage technology can help enhance grid stability by smoothing out the variability of renewable energy sources, providing a quick response to sudden changes in demand or generation. As the UK moves forward towards a clean power system, alongside flexible gas generation, battery and storage projects will have a vital role in maintaining security of supply and supporting the growth of renewables.

Tom Glover, RWE UK Country Chair, added: "Wales has significant potential to lead the UK's clean energy transition across wind, solar, storage, hydro, and emerging technologies. Despite the challenges facing energy projects everywhere, we see a government determined to unlock this opportunity for the benefit of communities across Wales, something we strongly support."

RWE's Operations in Wales

RWE is the number one renewable energy generator in Wales and is currently involved in over 3 GW of energy across 12 sites, of which around 1 GW is renewable. The existing renewable energy portfolio already generates around a quarter of Wales' renewable energy production.

The company directly employs around 300 people in Wales, with dedicated offices in Baglan and Dolgarrog, as well as on-site at power stations. Additionally, wind farms operated by RWE have invested over GBP 21 million into Welsh communities neighbouring their sites through community benefit funds.

As a driver of the energy transition, RWE develops, builds, and operates battery storage systems in the USA, Europe, and Australia. The company currently operates battery storage systems with a total capacity of around 1.2 Gigawatts (GW), and has a further 2.7 GW under construction. As part of its growth strategy, RWE plans to significantly increase its worldwide battery storage capacity.

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