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


Heatcube facts and figures

10-30 MW
charging capacity
16-120* MWh
storage capacity (*customization)
up to 20 MW
discharge capacity
135-400 °C
temperature of steam
> 93%
Round-trip efficiency (RTE)
< 90 sec
Charge response time (ramp up time)
~250 kWh/m2
low storage footprint
>25 years
long lifetime
Inside Heatcube

Converting green energy into stable heat production.

Renewable energy sources, like wind and solar, are intermittent suppliers. Heatcube is the solution to stabilizing this supply to meet mass industrial demand.

Kyoto Heatcube Circulation Animation_reduced

Simultaneous charging and discharging: the molten salt circulation system is designed for separate charging (electrical heating) and discharging (steam generation).

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.

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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


Who is Heatcube for?

All industries that need low-cost, reliable heat are Heatcube industries.

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.


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.

Does it pay off to switch to renewable heat?

Find out how much you can save with Heatcube.

Take the cost value test

Your Heatcube options

Product or service: Heatcube how you need it

Heat as a Product (HaaP) or Heat as a Service (HaaS).

Heat as a Product (HaaP)
  • Direct sales
  • Support and service agreements with customers
Heat as a Service (HaaS)
  • Heat purchase agreements (HPA)
  • Operated by Kyoto and/or partner
Research & reports

Heatcube in print: facts & figures

The green energy landscape is constantly shifting. Read about how Heatcube fits into industrial decarbonization

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Product brochure

Heatcube at a Glance

Heatcube caters to multiple industries with varying production capacities. See how the Heatcube can supply your business needs.

Get the figures


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White paper

Heating the way forward - how to effectively decarbonize process heat

The world’s largest energy demand is for heat, primarily sourced from fossil fuels, which account for 40% of global carbon emissions. But what seems to be overlooked is that this can be readily electrified today!

Download the white paper


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White paper

How to start using renewable resources – and stop wasting your own

The world is on fire. Every day we use energy to heat things, in order to make things. But Dr. Silvia Trevisan knows how to stabilize unreliable green energy, in order to decarbonize a whole industry.

Download the whitepaper



Answers to the most common customer questions about Heatcube.

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.

Do you want to know more?

Get in touch with our commercial experts:

Tim de Haas

Chief Commercial Officer (CCO)
Get in touch

Pedro Montoro Sánchez

Commercial Director Iberia
Get in touch

Elena Davydova

Business Support Associate
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Lars Martinussen

Commercial Director Northern Europe
Get in touch

Heatcube chronicle

Inspiration through Stories

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