About Caldera

Caldera is on a mission to make sustainable, zero-carbon heat accessible and affordable for industry. Leveraging patented technology that has captured attention from 12 sectors across 15 countries, we’re tackling one of the climate crisis’s most overlooked challenges: industrial heat.
Based in Hampshire, just outside London, our headquarters serve as a comprehensive centre for innovation. Here, we manage everything from initial product development and prototyping to full-scale production. Our team, united by a passion for climate solutions, brings together a diverse range of expertise and backgrounds. Together, we’re not just imagining a cleaner future; we’re building it.

2017

2018

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Caldera is founded by James Macnaghten and Guy Winstanley to pave the way for sustainable and affordable energy storage.
We’re the first in the world to create a heat storage material using volcanic rocks and recycled aluminium.
2019
2020

We invent our vacuum insulation and heat extraction systems and combine our newly developed technologies in a 100kWh prototype.

We fit the first 100kWh unit in our CEO’s home. It’s still there today and shows that our technology is a safe and reliable solution to provide heat using 100% sustainable energy.

2021

2022

Our crowdfunding campaign is a big success – 1,300 people invest on CrowdCube, raising £1.5m and exceeding our goal by 250%.

We’re awarded a total of £0.8m in UK government funding to help us achieve the full potential of our technology. We put ten 100kWh units on long-term test in homes and a church and begin development of a larger-scale unit for industrial heat decarbonization. 

2023

2024

We win £4.3m of UK government funding for a follow-on project to develop a full-scale test facility at our factory and demonstrate a 4MWh industrial storage boiler.

We celebrate another highly successful crowdfunding campaign, raising £1.5m. Our industrial storage boiler demonstrator is commissioned and achieves its target to charge at 1MWe, and discharge steam at 1,000kg/h.

2017
Caldera is founded by James Macnaghten and Guy Winstanley to pave the way for sustainable and affordable energy storage. Despite the technology being in its infancy, we’re convinced of the untapped potential of thermal energy storage.
2018
We’re the first in the world to create a sustainable heat storage material using volcanic rocks and recycled aluminium.
2019
We invent our vacuum insulation and heat extraction systems. And combine our newly developed technologies in a 100kWh domestic prototype.
2020
We’re thrilled to fit the first Warmstone in our CEO’s home. We show our technology is a safe and reliable solution to provide heat using 100% sustainable energy.
2021
Our crowdfunding campaign is a big success – 1,300 people invest on CrowdCube, raising £1,520,000 and exceeding our goal by 250%.
2022
Winning multiple grants, we’re awarded a total of £800,000 in UK government funding to achieve our technology’s full potential. We begin to develop our first full-scale industrial product.

2023

We win £4.3m of UK government funding for a follow-on project to develop a full-scale test facility at our factory and demonstrate a 4MWh industrial storage boiler.

2024

We celebrate another highly successful crowdfunding campaign, raising £1.5m. Our industrial storage boiler demonstrator is commissioned and achieves its target to charge at 1MWe, and discharge steam at 1,000kg/h.