Thermal storage firm Rondo Energy raises US$60 million

LinkedIn
Twitter
Reddit
Facebook
Email

Thermal energy storage company Rondo Energy has completed a US$60 million fundraising round from investors including Rio Tinto, Microsoft, Aramco and Energy Impact Partners.

The funding, announced yesterday (16 August), was provided by existing investors Breakthrough Energy Ventures, Energy Impact Partners, SCG, and TITAN as well as new ones.

New investors joining them were Microsoft’s Climate Innovation Fund, mining giant Rio Tinto, chemicals firm SABIC, Saudi Aramco’s investment arm Aramco Ventures, investors SDCL Energy Efficiency Income Trust (SEEIT) and individual John Doerr.

Rondo’s product is a refractory brick that can be heated to as high as 1500°C (2732°F) and retains the heat to then be used either in heat form or for conversion back to electricity. The heat can be discharged over durations that span hours or days.

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

As part of the deal, Rio Tinto, Aramco Ventures, SABIC, SCG, TITAN, and SEEIT all joined Rondo’s Strategic Investor Advisory Board.

“We are honoured and excited by this opportunity to go faster by working with these leaders. Our Strategic Investor Advisory Board will help Rondo focus on the simplest, fastest ways to power their operations with low-cost clean energy and shape our priorities for ongoing research and development.” said John O’Donnell, CEO of Rondo Energy.

Industry accounts for a substantial chunk of global greenhouse gas emissions, with figures varying but it could be as high as 36% according to Rondo’s media release which called the electrification of industrial heat “the next trillion dollar market”.

The fundraise from Rondo comes a few months after it announced plans to build a production facility to manufacture its technology with an eventual annual capacity of up to 90GWh, it claimed.

The thermal energy storage sector has received a lot of interest in recent weeks. Last week, Energy-Storage.news reported on two other technology providers Kraftblock and MGA Thermal raising a combined US$27 million to commercialise their technology.

Read Next

August 13, 2025
Ceylon Electricity Board (CEB), the main electricity company in Bangladesh, has issued an RFP for large-scale BESS.
August 7, 2025
AES Andes, part of the US-based energy giant AES, has launched construction on two hybrid renewables-plus-storage projects in Chile with 2.2GWh of co-located BESS.
August 6, 2025
Construction has officially started on the 100MW/400MWh 4-hour duration Merredin battery energy storage system (BESS) in Western Australia.
July 30, 2025
Maharashtra State Electricity Distribution Co (MSEDCL) has launched a multi-gigawatt battery storage tender supported by Viability Gap Funding (VGF).
July 29, 2025
The government of Portugal has announced plans to invest €400 million (US$466 million) to improve its grid management capabilities and increase its battery energy storage system (BESS) capacity.

Most Popular

Email Newsletter