Work starts on site at Contego

2 March 2021

Groundworks have started on the second battery energy storage project from Harmony Energy and Fotowatio Renewable Ventures (FRV), part of Abdul Latif Jameel Energy and a leading global developer of renewable energy projects.

The 34 MW / 68 MWh Contego project near Burgess Hill in West Sussex, United Kingdom, will be one of the largest battery energy storage developments in the UK, with a system of 28 Tesla Megapack lithium-ion batteries, using Tesla’s Autobidder AI software for real-time trading and control. Due to be completed in June 2021 and operational soon after, it is part of a strategic energy storage pipeline to be launched globally by FRV.

Contego will be connected to the UK Power Networks distribution network, providing the capability to store energy from renewable sources and afford peak-time flexibility to the UK National Grid as part of the country’s continuing shift away from fossil fuels.

Peter Kavanagh, CEO of Harmony Energy, said: “This is a significant project not just for Harmony Energy and FRV, but for the flexibility and security of the UK’s energy mix. Being able to deliver projects of this size without subsidies shows the potential for utility scale battery energy storage in the UK and the value of battery storage in providing flexibility to the grid will only increase as the UK’s penetration of renewable energy grows.”

David Menéndez, Head of FRV-X, said: “Energy storage is one of the keys towards decarbonization and Contego represents our next step in our long-term commitment to foster the growth of energy storage deployment worldwide. FRV is taking an important step in its storage roadmap working once again with Harmony Energy on the development of a large scale project which will bring additional flexibility capabilities to the UK’s state-of-the-art electrical system while facilitating the integration of renewable energy supporting the UK’s ambitions on their carbon neutrality policies. We must remain enthusiastic to continue to innovate and stay engaged through new projects similar to this one in the country and globally.”



Battery energy storage systems (BESS) are the key to unlocking the full potential of intermittent renewable energy; the more renewable energy that is connected, the more important the ability to manage its intermittent nature becomes. Harmony have 42MW/84MWh BESS operating in the UK, with a future 326MW/652MWh in build.

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