Your waste heat, turned into electricity
Using the Ericsson-type hot engine as a foundation, we’ve developed unique patented innovations that convert unused heat into affordable power.

A system designed for industry, built for impact
Based on the Ericsson Cycle, our patented solution converts waste heat into electricity with unmatched efficiency. It’s modular, compact, and built for real-world factory conditions no redesign required.
Temperature >180°C and Power >100kWth
Ericsson-based
open system upgraded with 2 innovative patents
Full adaptability across any °C and kWth combination
Scalable & Robust for Industrial-grade reliability
From heat to power, in 4 simple steps

Harness wasted heat
Designed for temperature >180°C and power >100 kWth heat recovery, the system provides a unique and full adaptability to all temperature and thermal load combinations.

Turn heat into power
The system operates on an Ericsson thermodynamic cycle for power generation. It incorporates a liquid piston that minimizes friction losses, resulting in greater efficiency and lower production costs.

Feed energy back
Our system stabilises the electricity and reinjects it either into your internal network or into the grid when not consumed on site.

Track performance
Through our custom-built dashboard and maintenance monitoring system, you can track your electricity production and performance both on site and remotely.
ExtraJool is making an impact both environmentally and economically
Waste heat is energy, yet most of it vanishes into the atmosphere. We’re changing that by transforming this lost potential into electricity cheaper than fossil energy.
billions €
to be saved with Heat-to-Power.
Source: McKinsey
tons CO2
saved per kWe installed
by ExtraJool (EU average)
years
of fixed electricity price
clients
signed (early access & early adopter)
They support our mission









Behind the tech, a team of builders
ExtraJool was founded by three seasoned entrepreneurs, engineers and operators with one goal: make clean energy a no-brainer for industrial players.

Technical questions? Let’s clear things up.
Our system is designed to be non-intrusive and modular. Our module is installed on a secondary circuite. If your process involves thermal losses, there's a good chance it fits, let's assess it together.
Module selection depends on both the quantity and characteristics of your available waste heat. Based on your specific profile, we can offer systems starting from 20 kWe. Each installation is tailored to the site’s unique conditions, ensuring optimal performance and maximizing both projected CO₂ reductions and cost savings..
Absolutely. Just contact us, we'll review your setup and estimate your energy recovery potential.
We conduct a technical evaluation based on your heat sources, temperature levels and site configuration, then we recommend the optimal module setup.
It depends on your heat flow, your waste heat will determine the electricity we will produce — to calculate your specific potential contact us.
At present, we are deploying a 20 kWe module on site, while the next generations of ExtraJool will reach 100 kWe and eventually 500 kWe. Contact us for any module !
Designed for longevity and durability, unlike products made for planned obsolescence, the machine has an expected lifetime of 20 years, ensuring a fixed electricity price throughout that period.