UK developer Harmony Energy’s IPO raises US$251 million for Tesla Megapack rollout

By Alice Grundy
LinkedIn
Twitter
Reddit
Facebook
Email
One of the two grid-scale battery projects using Tesla Megapacks Harmony Energy has already deployed in the UK through a joint venture with Fotowatio Renewable Ventures. Image: Harmony Energy.

UK renewable energy and battery storage developer Harmony Energy has raised gross proceeds of £186.5 million (US$251 million) to fund a battery storage rollout, through the placing and offer for subscription of its Initial Public Offering (IPO).

First announced last month through the company’s investment fund Harmony Energy Income Trust, the IPO has seen the company issue 210 million ordinary shares at a price of £1 each. Applications have been made for the admission of these shares to trading on the Specialist Fund Segment of the London Stock Exchange’s main market.

This article requires Premium SubscriptionBasic (FREE) Subscription

Enjoy 12 months of exclusive analysis

  • Regular insight and analysis of the industry’s biggest developments
  • In-depth interviews with the industry’s leading figures
  • Annual digital subscription to the PV Tech Power journal
  • Discounts on Solar Media’s portfolio of events, in-person and virtual

Or continue reading this article for free

The company has issued c.23.5 million ordinary shares in connection with the acquisition of its seed portfolio, a collection of five energy storage assets that together total 213.5MW/427MWh and which are set to use Tesla’s battery storage technology. A framework agreement is in place, giving Harmony Energy access to Tesla’s two-hour duration Megapack systems and Autobidder AI revenue optimisation platform, while the assets will be covered by a 15 year warranty.

On admission to the London Stock Exchange, the company will acquire the seed portfolio in accordance with the terms of the seed portfolio share purchase agreement, and the projects will be transferred to Harmony Energy.

Alongside the seed portfolio, Harmony Energy is to acquire a 99MW/198MWh advanced project, raising its initial portfolio to 312MW/625MWh.

“Now is the time to bring battery energy storage projects online in scale to help facilitate the transition to net zero and the company is well-placed with its exclusive pipeline of future projects to be a key player in this market,” Max Slade, commercial director and general counsel at Harmony Energy Advisors Limited said.

Tesla’s Megapack systems are also being used in Harmony Energy’s 7.5MW/15MWh Holes Bay, 34MW/68MWh Contego and 99MW/198MWh Clay Tye sites, which were developed jointly with FRV. Contego was completed earlier this year, while Clay Tye entered into construction in September.

This story first appeared on Solar Power Portal.

3 June 2025
Stuttgart, Germany
Held alongside the Battery Show Expo Europe in Stuttgart, Energy Storage Germany spotlights Germany’s rapid ascent in the European storage sector. Once driven by residential demand, utility-scale projects are now surging, with 184 MW added across 44 projects in 2023. With nearly 16 GWh of capacity installed in the first half of 2024, Germany is set to integrate 24 GW of utility-scale energy storage by 2037, creating substantial opportunities.
24 February 2026
InterContinental London - The O2, London, UK
This isn’t just another summit – it’s our biggest and most exhilarating Summit yet! Picture this: immersive workshop spaces where ideas come to life, dedicated industry working groups igniting innovation, live podcasts sparking lively discussions, hard-hitting keynotes that will leave you inspired, and an abundance of networking opportunities that will take your connections to new heights!

Read Next

Premium
April 16, 2025
Colorado-based IPP Korsail Energy has been dealt a blow in its quest to develop a 320MWh hybrid solar-BESS project in the Centennial State.
Premium
April 15, 2025
A reduction in price volatility has seen BESS revenue decrease by 40% in Australia’s NEM month-on-month in March 2025.
April 11, 2025
UK regulator Ofgem has launched a cap and floor investment support scheme to unlock funding for new Long Duration Electricity Storage (LDES).
April 10, 2025
A 238.5MW/477MWh standalone battery energy storage system (BESS) has been commissioned in South Australia, and an optimisation deal signed for another of the state’s largest BESS assets.
April 9, 2025
A news roundup focusing on optimisation specialist Habitat Energy’s recent moves in the industry, FlexGen’s new energy management system feature and a newly announced battery subscription service from Nuvve.

Most Popular

Email Newsletter