# Pembroke Battery Storage; also referred to as the RWE Pembroke Battery project. Publisher: CapexCue Canonical dossier: Dossier reference: release 1 (268f162b-db7d-4432-beb2-a036c4c39306) Released project intelligence Oldest supporting observation: 2026-10-15T10:59:33.141142+00:00 Dossier released: 2026-10-16T11:34:38.192029+00:00 Source report dates and capture dates are listed per fact below; neither establishes an event date. ## 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. Current purchasing availability: unknown. Source-dated plans do not establish current progress or available supplier packages. ## Project metadata Country: United Kingdom Region: Europe Physical assets: Battery Storage Derived from the exact released evidence; unresolved fields remain unclassified. ## Project category Energy Derived from the reviewed scope statement; delivery stage remains unclassified. 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. Source: uk.rwe.com — https://uk.rwe.com/press-and-news/2025-12-01-rwe-to-build-its-largest-battery-energy-storage-facility-in-the-uk/ | published unknown | observed 2026-10-15T10:59:33.141142+00:00 Project overview Oldest decisive evidence: 2026-10-15T10:59:33.141142+00:00 Newest evidence: 2026-10-15T10:59:33.141142+00:00 Knowledge reviewed: 2026-10-15T11:02:18.195569+00:00 Publication reviewed: 2026-10-16T11:34:37.520792+00:00 ## Date Press-release dateline: Pembroke, 1 December 2025. Status: reported Attribution: uk.rwe.com Source: uk.rwe.com — https://uk.rwe.com/press-and-news/2025-12-01-rwe-to-build-its-largest-battery-energy-storage-facility-in-the-uk/ | published unknown | observed 2026-10-15T10:59:33.141142+00:00 ## Name Pembroke Battery Storage; also referred to as the RWE Pembroke Battery project. Status: reported Attribution: uk.rwe.com Source: uk.rwe.com — https://uk.rwe.com/press-and-news/2025-12-01-rwe-to-build-its-largest-battery-energy-storage-facility-in-the-uk/ | published unknown | observed 2026-10-15T10:59:33.141142+00:00 ## 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. Status: planned Attribution: uk.rwe.com Source: uk.rwe.com — https://uk.rwe.com/press-and-news/2025-12-01-rwe-to-build-its-largest-battery-energy-storage-facility-in-the-uk/ | published unknown | observed 2026-10-15T10:59:33.141142+00:00 ## Country United Kingdom. Status: reported Attribution: uk.rwe.com Source: uk.rwe.com — https://uk.rwe.com/press-and-news/2025-12-01-rwe-to-build-its-largest-battery-energy-storage-facility-in-the-uk/ | published unknown | observed 2026-10-15T10:59:33.141142+00:00 ## Activity RWE describes the intended operation as storing surplus energy and feeding it into the national grid when required. Status: reported Attribution: uk.rwe.com Source: uk.rwe.com — https://uk.rwe.com/press-and-news/2025-12-01-rwe-to-build-its-largest-battery-energy-storage-facility-in-the-uk/ | published unknown | observed 2026-10-15T10:59:33.141142+00:00 ## Location Planned for a 5.1-hectare area south of RWE’s Pembroke Power Station, in the Pembroke area of South Wales. Status: planned Attribution: uk.rwe.com Source: uk.rwe.com — https://uk.rwe.com/press-and-news/2025-12-01-rwe-to-build-its-largest-battery-energy-storage-facility-in-the-uk/ | published unknown | observed 2026-10-15T10:59:33.141142+00:00 ## Developer RWE; the release describes Pembroke Battery Storage as RWE’s project. Status: reported Attribution: uk.rwe.com Source: uk.rwe.com — https://uk.rwe.com/press-and-news/2025-12-01-rwe-to-build-its-largest-battery-energy-storage-facility-in-the-uk/ | published unknown | observed 2026-10-15T10:59:33.141142+00:00 ## Investment Described as a circa £200 million development. Status: reported Attribution: uk.rwe.com Source: uk.rwe.com — https://uk.rwe.com/press-and-news/2025-12-01-rwe-to-build-its-largest-battery-energy-storage-facility-in-the-uk/ | published unknown | observed 2026-10-15T10:59:33.141142+00:00 ## Regulatory 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. Status: reported Attribution: uk.rwe.com Source: uk.rwe.com — https://uk.rwe.com/press-and-news/2025-12-01-rwe-to-build-its-largest-battery-energy-storage-facility-in-the-uk/ | published unknown | observed 2026-10-15T10:59:33.141142+00:00 ## Next Milestone 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. Status: planned Attribution: uk.rwe.com Source: uk.rwe.com — https://uk.rwe.com/press-and-news/2025-12-01-rwe-to-build-its-largest-battery-energy-storage-facility-in-the-uk/ | published unknown | observed 2026-10-15T10:59:33.141142+00:00 ## Financing Stage Final investment decision taken. Status: reported Attribution: uk.rwe.com Source: uk.rwe.com — https://uk.rwe.com/press-and-news/2025-12-01-rwe-to-build-its-largest-battery-energy-storage-facility-in-the-uk/ | published unknown | observed 2026-10-15T10:59:33.141142+00:00 ## Cite this dossier CapexCue — Pembroke Battery Storage; also referred to as the RWE Pembroke Battery project. — dossier released 2026-10-16T11:34:38.192029+00:00, release 1 (268f162b-db7d-4432-beb2-a036c4c39306) — https://capexcue.com/projects/pembroke-battery-storage-also-referred-to-as-the-rwe-pembroke-battery-project-0f001e6a-718/. For current information and later dossier updates, visit . This file records the release identified above; the current dossier may change.