ESREE Energy  is committed to the realization of a sustainable energy society.

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ESREE Energy  is committed to the realization of a sustainable energy society.


What we do

Development of Pumped Thermal Electricity Storage (PTES)
We are developing Pumped Thermal Electricity Storage (PTES), an energy storage method based on the heat pump principle, which is expected to be an inexpensive energy storage method.

Research on High-Temperature Heat Pumps
We are investigating the feasibility of high-temperature heat pumps (200°C to 300°C) as a derivative of Pumped Thermal Electricity Storage (PTES) research and development.

Market and Technology Research on Energy Storage
We are conducting research on market trends, technologies, policies, and systems for energy storage, which is expected to see increased demand in the future as the amount of renewable energy introduced expands.

Company's story

Our Specialty
Pumped Thermal Electricity Storage (PTES) is a thermal energy storage technology using heat pump technology, sometimes called Pumped Thermal Energy Storage, Electro-Thermal Energy Storage (ETES), etc. (Note). The heat pump cycle is used to generate heat and cold, which are then stored, and when electricity is needed, the heat and cold are used to generate electricity by running a Rankine cycle or similar system. By using inexpensive materials to perform the role of heat storage, this technology is expected to become an inexpensive energy storage technology.

In general, the weak point of thermal energy storage is said to be its low charge-discharge efficiency, and PTES is expected to be a method with high charge-discharge efficiency among thermal energy storage methods. This is because In practice, however, due to mechanical energy loss, heat loss, and other factors, a mechanism is needed to increase charge/discharge efficiency.

We are researching and developing PTES that can achieve high charge/discharge efficiency, so please feel free to contact us if you are interested in PTES.

Note: Some may say that these are strictly different technologies, but we recognize that they are essentially the same technology.
Our story
Development of thermal energy storage technology, market and technology research related to energy storage, etc.

General Information

Company name
ESREE Energy Corporation