Ameresco Secures $249M Contract and Long-Term Service Agreement with Atlantic Green for Major UK Battery Energy Storage Project

Ameresco, Inc., a leading cleantech integrator specializing in energy efficiency and renewable energy, announced that it and Envision Energy have been selected by Atlantic Green to build the Cellarhead project, a 300-megawatt (MW) battery energy storage system (BESS) with a maximum capacity of 624 megawatt hours (MWh). Connected to National Grid’s Cellarhead sub-station, this project will enhance the UK’s energy security and reliability. Ameresco and Atlantic Green aim to complete the BESS and secure grid connection by mid-2026. Upon completion, Atlantic Green will own and operate the BESS as an energy storage asset.

Established in 2021 as a joint venture between Nofar Energy and Interland Group, Atlantic Green is a UK-based platform dedicated to investing in, developing, and operating grid-scale standalone battery energy storage systems across the UK. With a mission to develop approximately 2 GW of battery storage capacity to support the UK’s clean energy transition, the Cellarhead BESS marks a significant milestone in their journey and sustainability goals. As part of the project, Ameresco has entered into an EPC and O&M contract, which includes battery supply, balance of plant, warranty, and availability guarantees. The total EPC contract is valued at approximately $249 million (196.5 million GBP). Tier 1 OEM Envision Energy will supply the BESS, associated services, and equipment warranties.

“We believe that a continuous development of battery energy storage is a vital step in the UK’s journey to achieving net-zero carbon emissions, and we are excited to team up with Ameresco to bring this vision to life,” said Nick Bradford, Managing Director of Atlantic Green. “Since our founding, Atlantic Green has consistently prioritized finding strategic ways to leverage our battery storage assets with the wider community and we are eager to answer the rising demand for battery storage with this new project with such a level of energy capacity, to really make the impact on the UK electricity system that is much needed.”

“We’re excited to announce our collaboration with Atlantic Green to construct one of the largest battery energy storage projects in the United Kingdom,” said Mark Apsey, MBE, Senior Vice President of UK Operations at Ameresco. “Energy storage is one of the key technologies required to achieve the UK’s net zero targets. Atlantic Green’s strong company leadership and robust track record of developing similar projects makes them an excellent partner in this endeavor. Together, Ameresco and Atlantic Green will help support the UK’s progress towards increased power autonomy and achieving net-zero carbon emissions by 2050.”

“This project exemplifies our commitment to pushing the boundaries of battery storage technology, a cornerstone of sustainable energy systems,” said Kane Xu, Global VP, Envision Energy. “Partnering with Atlantic Green and Ameresco allows us to demonstrate the pivotal role that advanced battery solutions play in enhancing energy security and enabling a seamless transition to renewable energy sources. We are proud to contribute our cutting-edge technology to this landmark UK initiative.”