Battery storage

Developing a large-scale energy storage capability will help to resolve the challenge of the intermittency of renewable generation. At InterGen, we’re managing the delivery of one of Europe’s largest battery storage portfolios, with over 2GW of grid scale projects, having dedicated grid connections and proceeding through the permitting process.

The share of wind and solar power is increasing in the UK’s energy mix, but these sources only generate power when the wind blows or the sun shines. The use of batteries to store the excess power generated can help provide low carbon power to balance supply and demand with renewable power during periods of low output.

InterGen’s UK battery projects are world-leading in this kind of technology deployment. The facilities will use proven lithium-ion technology which has zero emissions, has superior flexibility, and will complement the increasing amounts of renewable energy generation in the UK.

In Essex, our project at London Gateway Port to create up to 900MWh of energy received planning permission in January 2023, and when complete will be large enough to provide power for up to 450,000 homes. At Spalding, we have consent to develop up to 1.1GWh of storage capability, adjacent to our existing operational CCGT and OCGT plants. Both of these developments are world-class in terms of size. It’s all part of our goal to support the transition to low carbon generation through the provision of flexible capacity.

About the technology

The UK is one of the world’s most advanced markets for large scale battery storage, and grid scale battery storage is growing rapidly thanks to falling capital costs, government support via Capacity Market, mature wholesale market and rising demand for the range of flexible services that storage provides.

As well as being emission free and ensuring security of supply by integrating intermittent renewables into National Grid system services, battery storage can secure revenue through energy arbitrage and by providing ancillary support such as peaking services and frequency response.

The lithium-ion batteries used at scale are, in essence, just the same as those we use in millions of consumer devices every day. These batteries use a cathode (positive electrode), an anode (negative electrode), and an electrolyte as the conductor.

When the cell is charging up, ions travel from cathode to anode until the anode is full and the battery is charged. On discharge, the ions travel back into the cathode through the electrolyte, via an external circuit, producing electricity.

Battery storage technologyArtists impression of a large scale battery storage project.

Find out more about InterGen's battery development projects here


1,000 Capacity (MW)
2GWh Total size of battery development projects
1 million Homes to be powered by batteries