
Heatcube
The Thermal Battery for our future
Providing high volume, stable, electrified heat to industry – the missing link between renewable energy and heat demand.
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Reliable green energy at low cost
Enabling energy load shifting, by exploiting energy from renewable sources when it’s abundant, and storing it for later use. Thermal Energy Storage (TES) solutions, like Heatcube, ensure energy is consumed at its greenest and lowest cost.
Reduce energy costs
Reduce the cost of energy by charging Heatcube when electricity is cheaper at night, and take advantage of competitive prices.
Decarbonize heat production
Use Heatcube to run production without producing CO2. No emissions mean another saving – no additional CO2 taxes.
Secure energy supply
Heat stored means it is available when you need it. With a secure energy supply, fluctuations in the energy market have less impact, leaving pricing margins safe from political influence.
Remove fossil fuels
Charge with electricity from renewables. Being able to charge and discharge Heatcube simultaneously means there is flexibility to accommodate the intermittence of solar and wind power sources.
AI-enabled thermal battery
Kyoto’s DataOps platform brings a new era of operational excellence, reducing operational expenses and offering state-of-the-art preventive and predictive maintenance..
A balancing asset
The advantages of Heatcube: from rapid response times and enhanced grid stability to seamless integration with local renewable energy sources. Unlock its value as a crucial asset in the AFRR and MFRR markets


Simultaneous charging and discharging: the molten salt circulation system is designed for separate charging (electrical heating) and discharging (steam generation).
Live from Heatcube at Norbis park
Digitization with Kyoto’s DataOps platform
Enabling our customers to stay ahead of the curve in a rapidly changing energy market with AI-powered Heatcube.

Experience a transformative edge with Kyoto’s Heatcube as we introduce real-time monitoring and control through digital innovation.
Kyoto’s DataOps platform, powered by Cognite Data Fusion®, brings a new era of operational excellence, reducing operational expenses and offering state-of-the-art preventive and predictive maintenance.
This integration not only enhances operational efficiency but also positions Heatcube to align with emerging power market players, providing flexibility and potential new revenue streams for industrial plant owners.
With real-time monitoring and control through digital innovation, Heatcube delivers precise heat storage optimization. Seamlessly integrate with variable renewable sources and respond to demand effectively.
The information shown in the image is based on anticipated accumulated results for our most common Heatcube found in our product brochure.
Phone frame designed by zlatko_plamenov / Freepik
Kyoto Group is a validated member of the World Alliance for Efficient Solutions by Solar Impulse Foundation
Our flagship product, Heatcube, has earned the prestigious Solar Impulse Efficient Solution Label, which recognizes clean, profitable solutions with the potential to tackle today’s pressing environmental challenges.
The World Alliance unites 1,000 innovative solutions from startups, companies, and institutions that are committed to creating jobs, generating profit, and protecting the environment—all while improving quality of life. The foundation is a dedication that emerged from a solid conviction: climate change can only be tackled through the lens of profitability and popular endorsement.
Discover more about Heatcube's Solar Impulse Efficient Solution labell

Paper, pulp and print
Heat is used to dry the pulp and heat the calendar rolls. It is also needed for recycled newsprint, specialty papers and packaging.

Chemical and petrochemical
Most of the heat is used for ammonia production by steam reforming of natural gas, steam cracking of naphtha and steam cracking of gas oil.

Food
Cooking, preheating, washing and pasteurization are the main areas for heat demand. A big share of energy is also used for refrigeration.

Iron and steel
Steel production requires very high temperatures to heat and melt iron ore. We can save a lot of energy by pre-heating the production parts.

Non-metallic minerals
Most of the heat demand in the sector comes from cement production and requires temperatures of over 400°C.

Non-ferrous metals
Heat is used almost entirely in specific electrical processes. It is required mostly in the aluminum, copper and zinc production.
This is a very important milestone for the project. It shows the close collaboration between Kyoto and Aalborg CSP to venture into this important market of storing excess electricity into usable heat, which we can use to transform and transition the energy supply for not only Northern Europe but the rest of the world.
Svante Bundgaard, CEO of Aalborg CSP
It is exciting to work together with the young and dynamic team of Kyoto and you can really feel the energy and the eagerness of the entire project team to contribute to a greener future. It gives me personally extra motivation for the entire project.
Magne Ryholt, Høglund Project Manager
We are proud of the smooth and successful introduction of the world’s largest electrical heater for molten salt and are looking forward to the large-scale commercial roll-out of Heatcube as well as the further development of the technology together with Kyoto Group.
Christopher Molnar, Managing Director of Vulcanic, a Spirax Sarco company
The partnership with Kyoto and its Heatcube thermal storage solution is a further step for Iberdrola in its mission to decarbonize the economy through electrification. Storage is one of the major challenges in the energy transition, hence this collaboration with the Norwegian group will be key to our strategy
Fernando Mateo, Global Head of Industrial Decarbonization at Iberdrola

Hassle-free heat
Heat as a Service (HaaS)
Access clean, renewable heat with minimal upfront investment. Kyoto Group takes care of installation, operation, and maintenance while you simply purchase heat as you need it. This turnkey solution eliminates financial barriers and simplifies the transition to sustainable energy for your industry.
Heat Purchase Agreements (HPA)
Lock in predictable energy costs with a long-term Heat Purchase Agreement (HPA). HPA ensures cost stability while helping businesses meet sustainability goals—ideal for those aiming to decarbonize their business.
Operated by Kyoto and/or partner
All HaaS solutions are managed by Kyoto Group or trusted partners, ensuring seamless operation and reliability. From energy storage to heat delivery, we handle every detail so you can focus on running your business efficiently.

Calor a su medida
Heat as a Product (HaaP)
With Heat as a Product (HaaP), you gain ownership of a Heatcube, allowing you to produce renewable heat on-site. This solution integrates into your operations, delivering high-temperature heat while cutting emissions and energy costs. By adopting this technology, you turn sustainability into a valuable business asset.
A sustainable investment
Owning a Heatcube is an investment in energy independence and long-term cost savings. It empowers your business to reduce reliance on fossil fuels, meet sustainability goals, and position itself as a leader in clean energy adoption.
Based on one cycle per day, the round trip efficiency from electricity to steam is minimum 93%.
Heatcube is equipped with a 20 MW steam generation system. The temperature and pressure do depend on the feed water supply and energy storage volume, but our standard configuration (64 MWh storage) delivers more than 12 hours of 7.5 tons per hour at 16 bar(a), with a feedwater temperature of 100°C (equals 5 MWh for 12 hours).
Heatcube is supplied with a Battery Management System (BMS), which can be connected with the local Energy Management System (EMS) using a standard industry interface. The storage tanks do not require any preventive or periodic maintenance. The auxiliary systems (pumps, valves, etc) require minimal ongoing maintenance and training will be provided.
For an industrial facility with steam demand covered by an electric boiler, the energy cost is directly related to the average and/or peak power prices in the region it is located. With Heatcube, we can offer significant energy savings by load-shifting the electricity demand from high-priced to low-priced hours in the power market.
The increasing share of intermittent renewable power production together with decommissioning of fossil-based power generation creates more price volatility in the power markets. In the hours with high wind and solar power output and low demand, the power prices become very low, while in hours with less wind and solar, the power prices are consequently very high. With Heatcube, we are utilizing the increasing price volatility in the power markets to store energy in hours with high renewable production and low prices. When charging Heatcube with cheap electricity from excess renewable power production, we can deliver renewable heat whenever needed at a very low cost. At the same time, we are replacing fossil fuels with renewable electricity as the energy source for heat production, and so removing close to all carbon emissions associated with the industrial heat demand.
Heatcube is designed with a steam temperature range from 135°C to 400°C and can generate up to 20MW of discharge capacity. The saturated steam temperature is between 135°C and 212°C, with a steam pressure between 8 and 20 bar(a). To achieve 400°C with a pressure 3 - 40 bar(a) (superheated steam) a superheater can be added to Heatcube steam generator.



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