Exergy3 has raised £10 million in seed funding to scale a technology platform designed to address industrial decarbonisation, grid balancing, and energy security at the same time. The Edinburgh-based company is focusing on a structural problem that is becoming more visible across Europe’s energy system: renewable power is increasingly being wasted when supply outpaces grid demand, while industry still struggles to secure reliable, high-temperature heat without relying on fossil fuels.

This matters because these are not separate challenges. They are increasingly part of the same energy mismatch. As renewable generation grows, curtailment costs are rising, yet many industrial users still lack cost-effective low-carbon heat options. Exergy3 is building its business around connecting those two sides of the system.

 

Grid balancing costs are creating a stronger commercial case

 

The timing of the raise is important. In the UK alone, £2.7 billion was spent balancing the grid in 2024 to 2025, reflecting the growing gap between renewable electricity generation and the system’s ability to use it in real time. That means low-carbon electricity is often being curtailed even as overall system costs rise.

This creates a commercially attractive opening for technologies that can absorb surplus electricity and convert it into useful industrial energy. Exergy3’s model is based on exactly that logic. Instead of allowing excess renewable power to go unused, the company’s thermal storage system converts it into high-temperature heat that can be deployed in industrial settings.

 

Industrial heat remains one of the hardest decarbonisation problems

 

Industrial heat is a particularly important target because it represents a large share of energy demand and emissions, yet remains difficult to decarbonise. Many industrial processes require high, continuous temperatures that are hard to replace with direct electrification alone. This has made industrial heat one of the most persistent gaps in the energy transition.

Exergy3 is trying to solve that gap by delivering process temperatures from 50°C to 1,200°C through modular thermal energy storage units. That range makes the technology relevant across a wide variety of industrial applications, from steam generation to direct process heat in energy-intensive sectors.

 

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The company is moving from demonstration to commercial rollout

 

The seed funding marks a transition point for the business. Exergy3 says it has already delivered and validated its first-of-a-kind system in real-world conditions, and the new capital will now support the next phase of scale-up. The company plans to use the funding to expand manufacturing capacity, grow its team, and support wider deployment across industrial sites.

This shift is significant because climate hardware companies often face the toughest challenge in moving from technical proof to commercial delivery. Exergy3 is now entering the stage where execution, repeatability, and deployment speed matter as much as the underlying technology.

 

Investors are backing a broader industrial climate thesis

 

The round was led by Axeleo Capital and included Bayern Kapital, Kibo Invest, Scottish Enterprise, Zero Carbon Capital, and Old College Capital. The investor base reflects growing interest in industrial climate technologies that do more than reduce emissions in theory. Exergy3 is offering a system that can potentially lower costs, reduce curtailment, improve energy resilience, and support industrial competitiveness.

That makes the company’s value proposition broader than a typical clean energy hardware play. It is not only about carbon reduction. It is also about system efficiency, energy security, and turning existing renewable overcapacity into economic value.

 

Germany is emerging as part of the next growth phase

 

As part of its expansion, Exergy3 plans to open a Munich office later this quarter, building a stronger presence in Germany and across continental Europe. That is a logical step because Germany remains one of the most important industrial markets in Europe and one of the most relevant regions for technologies that can decarbonise process heat while supporting grid flexibility.

The company also plans to double its headcount by the end of the year, showing that the raise is intended to support rapid organizational growth as well as technical deployment.

 

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A modular approach could improve adoption

 

One of the more commercially important parts of the story is the company’s modular design. Exergy3 says its thermal energy storage units are compact, relatively easy to install, and require minimal infrastructure changes. That could matter a great deal in industrial environments, where adoption often depends not only on performance, but also on how easily a technology can be integrated into existing operations.

If the system can deliver high-temperature heat with limited disruption, it may have a stronger chance of moving faster into real industrial use than solutions that require more extensive redesign of plant infrastructure.

 

What this signals

 

The broader takeaway is that Exergy3 is positioning itself at the intersection of three major European priorities: decarbonising industry, reducing renewable curtailment, and improving energy resilience. That combination gives the company a stronger strategic profile than a single-purpose climate technology.

If it can execute successfully, Exergy3 could become an important example of how grid flexibility and industrial decarbonisation can reinforce each other rather than compete for attention. The core idea is simple but powerful: surplus renewable electricity should not be treated as waste when it can be converted into one of the hardest forms of energy to decarbonise.

 

Source: Exergy3