Solution | Product

25kW Low-to-Medium Temperature Stirling Engine

Stirling Engine modules to generate clean electricity from waste heat locally.

Cool Energy’s novel air engine uses captured waste heat at between 150 and 400° C to produce clean electricity on-site.

In remote locations, electricity is commonly generated with diesel-fueled generators. Recovering the heat from the exhaust manifold with a Stirling engine - extremely efficient compared to internal combustion engines - can produce extra electricity, thereby reducing fuel consumption. The solution has other applications such as solar thermal and biomass generation, and can allow for significantly reduced fuel consumption.

Key features for a positive impact on quality of life

  • Low-temperature power conversion of recovered heat
  • Unique design maximizes efficiency
  • Common materials that keep costs low
  • Designed for long service life
  • Can be used in combination with other renewable energy systems
  • Can be applied to industrial or remote power generation processes, such as diesel generators or natural gas generators.


  • 2-6 year payback time for typical customers, depending on operating profile and avoided electricity or fuel cost.
  • Can generate $230,000 in social benefit from avoided pollution emissions from the grid.

25kW Low-to-Medium Temperature Stirling Engine by Cool Energy


The information set out above, is solely for the purposes of information and the Solar Impulse Foundation does not provide any guarantee as to its authenticity, completeness or accuracy. This information does not constitute investment advice or a recommendation to buy into, transact or to enter into any agreement with any of the parties or persons mentioned above. Potential investors or interested parties are solely responsible for their investment or business decisions and for performing any due diligence required by the circumstances.

Cool Energy, Inc.

Boulder, CO 80301, USA

Activity regions

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Solutions helps to achieve these SDG's.

  • Affordable and clean energy

  • Industry, innovation and infrastructure

Maturity stage

Looking for

Fundraising to build additional licensing partnerships for heat recovery and power generation, and growing their network in the European and Asian market.

Networking partner

Categories of application
Combustion, Gasification, Pyrolysis, Other emerging technologies, Power conservation, Heat pumps and exchangers, Water transport innovation, Cargo ships,