Varco Energy and Fluence Advance 142.5 MW Sizing John Energy Storage Project: Phase 1 Fully Operational, Launch of Phase 2

LONDON, Dec. 08, 2025 (GLOBE NEWSWIRE) -- Varco Energy (Varco), a pioneering UK-based battery storage asset owner and operator backed by the Adaptogen Capital Battery Storage Fund, and Fluence Energy UK Ltd. (Fluence), a subsidiary of Fluence Energy, Inc. (NASDAQ: FLNC), are pleased to announce Phase 1 of the Sizing John Battery Energy Storage System (BESS) has successfully entered full commercial operations.

The 57 MW / 137.5 MWh project is located within the Mersey Ring east of Liverpool, a region known for its acute grid constraints. In addition, Varco has launched Phase 2 of the project and selected Fluence to expand the site by an additional 85.5 MW / 201 MWh, to achieve a combined 142.5 MW / 348.5 MWh project.  On energisation of Phase 2, the Sizing John project will rank among the largest battery energy storage systems in the UK.

This milestone represents a major advancement in Varco’s and Fluence’s shared mission to accelerate the UK’s energy transition by deploying innovative, utility-scale battery storage solutions in one of the nation’s most constrained grid regions.

A Two-Stage, Innovative Approach to Grid Stability

The Sizing John project has been designed as a two-phase development to maximize both immediate and long-term impact. Phase 1 of the Sizing John BESS has a duration of 2.4 hours, which is one of the longest durations of any operational battery project in the UK. Its longer duration will help lower overall energy costs by addressing growing congestion in the region and reducing price volatility created by rising renewable generation.

Phase 1 is now fully operational, powered by Fluence’s Gridstack solution, providing critical storage capacity to help balance local supply and demand and support renewable integration. Phase 2 has commenced construction with an expected commercial operation date in Q4 2026. Phase 2 will incorporate the Fluence-supplied next-generation Gridstack Pro 5000 with advanced grid-forming capabilities, providing critical support to the UK’s grid by actively regulating voltage and frequency, providing essential regional grid stability.

Fluence has delivered and operates grid-forming projects worldwide, demonstrating the technology’s role in supporting stable, renewable-based power systems. The importance of such technology has been underscored by recent events, such as the Iberian blackout, which highlighted the urgent need for assets that can independently support both grid voltage and frequency without relying on traditional synchronous generation.

Richard Whitmore, Director, Varco Energy, said:

“Bringing Sizing John Phase 1 to operation and announcing Phase 2 is a testament to Varco’s commitment to innovation and grid resilience. The addition of grid-forming capabilities will set a new standard for regional grid support, especially in the wake of recent Iberian Peninsula blackout. We are proud to be delivering solutions that not only address today’s constraints but also lay the groundwork for a more flexible, renewable-powered future.”

Brian Perusse, Managing Director, UK & Ireland, Fluence, said:

“The successful delivery of Phase 1 and the expansion to Phase 2 reflects the trusted partnership between Varco and Fluence and our ongoing commitment to the market. Sizing John is a key step in bringing longer-duration storage and additional grid-forming capabilities to the UK, technologies that play a vital role in improving system resilience, unlocking greater renewable integration, and reducing costs to consumers. We are thrilled to continue working alongside Varco to deliver projects that strengthen the grid and support the UK’s transition to a net-zero future.”

This achievement marks the second Varco project to start operations, following Native River BESS commencing full commercial operations in April 2025. Over the next eighteen months, Varco expects to energise a further 250 MW of assets in the UK, with a further 275 MW in its pipeline, fully committing the capital from Adaptogen’s first fund.

By helping integrate renewable energy generation and balance the grid, Varco and Fluence are making sustainable energy accessible and affordable for all consumers.

Media contacts:

Varco Energy

Tom Huddart, Director, Camarco
Tom.huddart@camarco.co.uk
+44 (0)7967 521 573

Fluence

Joanna Spirodek, Director EMEA Marketing
joanna.spirodek@fluenceenergy.com
+44 (0)7804 730482

About Varco Energy

Varco Energy is a UK battery storage asset owner and operator, backed by the Adaptogen Capital Battery Storage Fund. With 250MW of assets operating or due to finish construction by 2026, and a further 275MW in its pipeline, Varco is committed to helping integrate renewable generation and balance the grid to make sustainable energy accessible and affordable for all consumers.

For more information visit: https://www.varco.energy/

About Adaptogen Capital

Adaptogen Capital is a specialist battery storage investment firm backed by some of the earliest investors in the UK storage industry. We were founded to provide insightful expertise to our investors and help them navigate the energy transition as sustainably and profitably as possible. Capital comes from a broad range of family office and institutional investors, with significant investment from our founding directors.

For more information visit: https://www.adaptogencapital.com

About Fluence

Fluence Energy, Inc. (Nasdaq: FLNC) is a global market leader delivering intelligent energy storage and optimization software for renewables and storage. Fluence’s solutions and operational services are helping to create a more resilient grid and unlock the full potential of renewable portfolios. With gigawatts of projects successfully contracted, deployed and under management across nearly 50 markets, Fluence is transforming the way we power our world for a more sustainable future.

For more information visit: https://fluenceenergy.com/ or follow us on LinkedIn or X. To stay up to date on the latest industry insights, sign up for Fluence’s Full Potential Blog.  

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