Biochar carbon removal.
Want to learn more about our projects, and how we are removing carbon via biochar? Explore our Green Hubs, carbon credits and biochar products.
Build it on your own site.
Looking for pyrolysis technology for your own site or project? Onnu Engineering designs CarboFlow plants that maximise ROI.
Onnu Green Hubs
We develop BCR projects in locations where we can deliver maximum environmental benefits:
- Close to good quality feedstock, currently with a low value or causing environmental harm.
- Using all our green energy to displace carbon intensive generation.
- At sites where we can scale up to >20,000 tCO2e annual removal.
We build our own projects, or work with partners with suitable sites or feedstock to share the benefits.

Partner with Onnu
Do you have a suitable site or feedstock for us to work with?
Are you interested in purchasing carbon credits?
Our Projects
Business model
Our Green Hub carbonization plants all operate on a simple yet highly effective business model:
Inputs
Pyrolysis

CarboFlow
Feedstock is thermally decomposed into biochar and syngas, which is combusted for energy to maintain the process and power any required drying process.
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Owner-operated pyrolysis plants powered by CarboFlow
Onnu's production sites use our proprietary pyrolysis technology, CarboFlow - engineered with years of first-hand experience of what is required to make pyrolysis projects truly viable.
The ability to work with a variety of feedstocks, the time to manufacture, and the cost of production are all challenges we addressed in CarboFlow's design. Through the introduction of our own technology we can accelerate the rollout of projects that bring the biomass pyrolysis industry closer to its full potential.
CarboFlow is a high-performance, end-to-end pyrolysis machine that delivers both environmental and financial sustainability.

Sustainable development goals
Pyrolysis operations contribute to 8 of the 17 sustainable development goals (SDGs).








Partner with Onnu
Do you have a suitable site or feedstock for us to work with?
Are you interested in purchasing carbon credits?
Developing your own project? Interested in CarboFlow to power your operations?







