A digital design of the Hyme Thermal Energy Storage plant.

New molten salt storage for the decarbonisation of heat

Hyme is deploying a large-scale thermal energy storage solution that stores electricity from renewables as heat in molten salts.

Molten salts have been used in the concentrated solar power (CSP) industry for decades, and it is the most mature technology for high-temperature storage of renewable energy.

Hyme leverages its patented salt treatment system to bring to market hydroxide salts as a storage medium. These salts have unique thermal properties which enable the reduction of the cost and space needed for storage and offer a cost-effective and scalable solution for decarbonising heat.

How Hyme storage works

Charging

Electricity from renewables is converted into heat through electrical heaters. Salt from the cold tank is circulated through electrical resistance heaters and warmed up to 600 ºC.

Discharging

The energy is stored in the hot tank for hours or days. The energy stored in the hot salt is released by circulating it through a steam generator, where it transfers its heat to water, producing high-temperature steam for heat or cogeneration applications. The cooled salt is pumped back into the cold tank until the next charging cycle.

THE GAME CHANGER

Hydroxide salts

The family of hydroxide salts have unique properties enabling cost reductions and higher efficiency in comparison to other salts in the thermal energy storage market.

  • Produced from salt water

  • No supply limitations

Sustainable &
abundant

Compact and efficient

  • High energy density gives compactness

  • High thermal conductivity can increase equipment efficiency

Low cost

  • Hydroxides are the lowest-cost salt medium

  • Thermal properties reduce structural material need

Safe

  • Non-toxic

  • Non-flammable

  • Low pressure

OUR PATHWAY TO RELIABILITY & EFFICIENCY

Salt treatment

Our world-class team of chemistry and material science specialists is addressing the toughest challenges of high-temperature molten hydroxide storage.

We have successfully developed proprietary methods for salt treatment and are now scaling them up from the lab to large-scale systems.

Our team is also developing salt mixes to optimise thermal properties and enhance the benefits of molten hydroxides for energy storage.

BEHIND THE SCENE

What does it take to bring a new storage technology to life?

Great engineers, audacity, simulations & prototypes!

Pipes and cables.
A clock that shows the pressure for steam.
Hyme team member working in the computer with some technical designs.

Molten salt labs

At Hyme’s Research and Development labs, we can create realistic test conditions for rapid testing, and enable cost reductions and design optimisation.

Prototyping facility

Located in the south of Copenhagen, our Prototyping facility is where we design, build, and operate custom equipment and experiments to deepen our understanding of molten salts in practical applications.

Multiphysics capabilities

We have an in-house team of Thermal-hydraulics Engineers, applying FEA and CFD to our storage system and equipment design.

Hyme utilises the Ansys suite of products for these activities