Fluence Energy UK Ltd. announced that Phase 1 of the Sizing John Battery Energy Storage System in the Mersey Ring, east of Liverpool, has entered full commercial operation. The 57 MW/137.5 MWh installation, powered by Fluence’s Gridstack solution, is now delivering grid‑stabilising services to the region. Phase 1’s 2.4‑hour duration makes it one of the longest‑duration battery projects in the UK.
Varco Energy, the project owner, has already begun construction on Phase 2, which will add 85.5 MW/201 MWh of storage. When energized in Q4 2026, the combined 142.5 MW/348.5 MWh system will become one of the largest battery energy‑storage projects in the United Kingdom and will provide grid‑forming capabilities through Fluence’s Gridstack Pro 5000 platform.
The expansion underscores Fluence’s growing presence in the UK market and aligns with the country’s aggressive renewable‑integration agenda. The Mersey Ring is a key grid corridor with acute constraints, and the long‑duration storage will help smooth intermittent wind and solar output while reducing price volatility for consumers.
Fluence’s recent financial performance highlights the strategic importance of wins like Sizing John. The company reported record revenue of $2.7 billion for fiscal year 2024, a 22 % year‑over‑year increase, and a 12.6 % gross margin. Adjusted EBITDA rose to $78.1 million, and the backlog reached $4.5 billion as of September 30 2024. CEO Julian Nebreda said the company is “focused on profitable growth and scaling its operations to meet the accelerating demand for energy storage worldwide.”
The Sizing John project also demonstrates Fluence’s commitment to advanced grid‑forming technology. Phase 2’s Gridstack Pro 5000 will enable the system to provide voltage and frequency support, a capability that is increasingly demanded by grid operators as renewable penetration rises. The long‑duration, grid‑forming storage positions Fluence as a key partner for utilities seeking domestic, high‑capacity storage deployments.
Overall, the successful commissioning of Phase 1 and the launch of Phase 2 represent a significant milestone for Fluence, Varco Energy, and the UK energy transition, reinforcing the company’s role as a leader in large‑scale battery storage solutions.
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