RWE Advances £200 Million Pembroke Battery Storage Project to Strengthen UK Grid Flexibility and Support Wales’ Net Zero Goals

RWE Advances £200 Million Pembroke Battery Storage Project to Strengthen UK Grid Flexibility and Support Wales’ Net Zero Goals

(IN BRIEF) RWE has taken the final investment decision on its £200 million Pembroke Battery Storage project, the company’s largest UK storage development to date and a cornerstone of the Pembroke Net Zero Centre in South Wales. The project, which holds planning consent and secured a route to market in the UK Capacity Market auction, will begin construction in early 2026 and is expected to enter operation in late 2028. Featuring 212 lithium-ion battery units, the system will supply 350 MW of power for two hours, providing 700 MWh of stored energy — enough to power nearly 300,000 homes for two hours. The announcement was made by Wales’ First Minister Eluned Morgan, who emphasized the project’s role in supporting Wales’ renewable energy ambitions. RWE leaders highlighted the importance of large-scale storage for stabilizing a renewable-heavy grid and advancing low-carbon energy infrastructure. The project also includes biodiversity improvements around the Pembroke site. RWE remains Wales’ top renewable energy generator, with over 3 GW of energy assets, and continues to invest heavily in global battery storage expansion.

(PRESS RELEASE) PEMBROKE, 2-Dec-2025 — /EuropaWire/ — RWE, the UK’s largest electricity generator and the leading power producer in Wales, has confirmed its final investment decision for the Pembroke Battery Storage project, marking a major step forward for the company’s clean-energy ambitions in the region. Valued at around £200 million, the development will become a central feature of the Pembroke Net Zero Centre, strengthening South Wales’ role in the country’s shift toward a low-carbon energy system.

The decision was unveiled by First Minister Eluned Morgan during the Wales Investment Summit, reflecting the Welsh Government’s intention to attract major infrastructure investment that supports long-term energy security and decarbonisation.

Planning approval for the project was granted earlier in the year, and the scheme also secured a contract in the UK’s latest Capacity Market auction — an essential commercial milestone that clears the way for construction. Work on the facility is planned to begin during the first half of 2026, with the battery scheduled to enter service in the latter half of 2028, pending confirmation of an updated grid connection agreement.

Located on 5.1 hectares adjacent to RWE’s Pembroke Power Station, the installation will include 212 lithium-ion battery containers. Once commissioned, the system will be capable of delivering 350 MW of power for two consecutive hours, storing 700 MWh of energy in total. That output is comparable to supplying the electricity needs of nearly 300,000 homes for two hours — a critical capability in balancing intermittency from wind and solar generation.

Nikolaus Valerius, CEO of RWE Generation SE, highlighted the vital role of storage technologies as the energy mix evolves:
“Battery systems are becoming indispensable in a power system with rising shares of renewables. Their speed and efficiency make them ideal for helping to keep the grid stable. Pembroke will be our flagship UK storage development and will support the system by storing excess energy and returning it to the grid precisely when needed.”

Wales’ First Minister Eluned Morgan emphasized the broader economic and environmental impact:
“This major investment shows how central Wales is to the UK’s clean-energy transition. Projects like Pembroke Battery Storage not only strengthen energy security but also bring new opportunities to communities across South Wales.”

RWE UK Country Chair Tom Glover added that Wales is well positioned to lead in a wide range of renewable technologies — from wind and solar to hydro and storage — and that government support remains essential for unlocking this potential.

Environmental enhancement is a core project component. RWE plans to implement new biodiversity measures around the site, including meadow habitats, native woodland planting, scrub restoration, and a wildlife pond designed to support local species.

In Wales, RWE is already the top renewable energy generator, operating more than 3 GW of projects across 12 sites. Roughly 1 GW of this capacity is renewable, contributing significantly to the nation’s clean-power supply. RWE employs approximately 300 staff in Wales and has invested more than £21 million into local communities through wind farm benefit funds.

Worldwide, RWE operates around 1.2 GW of battery storage systems and has an additional 2.7 GW currently being built. Expanding its storage fleet is a central component of the company’s global growth strategy.

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SOURCE: RWE