Pembroke Battery Storage; also referred to as the RWE Pembroke Battery project.
United Kingdom · Energy
In-depth researchRelease 1
Project scope
Planned battery energy storage system comprising 212 lithium-ion battery containers, with two-hour storage, up to 350 MW peak output and 700 MWh storage capacity; the release says the output and capacity figures apply once constructed and fully operational.
Reported status and procurement
Reported development
RWE describes the intended operation as storing surplus energy and feeding it into the national grid when required.
Procurement availability
Unknown / not established
Reported regulatory context
Planning consent reported received in January 2025 (described as January “this year” in the 1 December 2025 release); the project also reportedly succeeded in the UK’s latest Capacity Market auction, securing a route to market.
A source report alone does not establish current progress or an open buying window.
Project summary
RWE’s Pembroke Battery Storage project is planned for a 5.1-hectare area south of Pembroke Power Station in South Wales, United Kingdom. The planned system comprises 212 lithium-ion battery containers, with two-hour storage, up to 350 MW peak output and 700 MWh capacity; the release says those output and capacity figures apply once the system is constructed and fully operational. RWE describes the intended operation as storing surplus energy and feeding it into the national grid when required.
In a release dated 1 December 2025, RWE reported a final investment decision, planning consent received in January 2025 and success in the UK’s latest Capacity Market auction. The release described the development as circa £200 million and planned construction to 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. These are reported decisions and prospective, conditional dates; the release does not confirm that construction or commissioning occurred.
Evidence limits and unknowns
The 1 December 2025 release does not confirm whether construction began as planned, whether the updated and timely grid connection was received, or whether commissioning or operations have occurred.
The supplied release does not state whether supplier packages exist or whether procurement is open.
Investment and financing
Reported total investment
Described as a circa £200 million development.
Financing report and participants
Final investment decision taken.
Total investment and financing amount are different measures. Currency notation is retained as reported; no conversion or current funding availability is verified.
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Project metadata
Country
United Kingdom Based on reviewed release evidence
Region
Europe
Category
Energy Derived from released evidence
Physical assets
Battery Storage
Based on this release's supporting evidence. Unresolved fields remain unclassified; these labels do not establish current progress or a buying window.
Released facts and supporting evidence
Each fact retains its source, uncertainty and time context. If a publisher page moves or is unavailable, use the recorded quotation and observation date below.
Date
Source reported
Press-release dateline: Pembroke, 1 December 2025.
Attributed to uk.rwe.com.
Source: uk.rwe.com · publication date not recorded · observed 2026-10-15
Sources and evidence · uk.rwe.com
Source published: Not recordedObserved: 2026-10-15
Planned battery energy storage system comprising 212 lithium-ion battery containers, with two-hour storage, up to 350 MW peak output and 700 MWh storage capacity; the release says the output and capacity figures apply once constructed and fully operational.
Attributed to uk.rwe.com.
Source: uk.rwe.com · publication date not recorded · observed 2026-10-15
Sources and evidence · uk.rwe.com
Source published: Not recordedObserved: 2026-10-15
Planning consent reported received in January 2025 (described as January “this year” in the 1 December 2025 release); the project also reportedly succeeded in the UK’s latest Capacity Market auction, securing a route to market.
Attributed to uk.rwe.com.
Source: uk.rwe.com · publication date not recorded · observed 2026-10-15
Sources and evidence · uk.rwe.com
Source published: Not recordedObserved: 2026-10-15
The release planned construction to start in the first half of 2026 and expected commissioning and operations in the second half of 2028, subject to receiving an updated and timely grid connection.
Attributed to uk.rwe.com.
Source: uk.rwe.com · publication date not recorded · observed 2026-10-15
Sources and evidence · uk.rwe.com
Source published: Not recordedObserved: 2026-10-15
Prior and superseded states remain labelled. Dates below identify source publication when known, otherwise source observation. They are not assumed event dates; each fact retains its own time qualifications.
No material timeline events have been released.
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