We build technologies that fix the climate.
Engineered carbon removal. Built and operated in the UK.
At Nellie, we're driven by a singular purpose to mitigate the negative effects of climate change.
We've developed bioengineered carbon dioxide removal at speed and at scale. We use proprietary biomass growth, processing and sequestration channels to remove carbon dioxide from ambient and point sources which we then turn into biochar and biogenic aggregates to offer exceptional additionality and permanence.
High-Integrity Carbon Removal.
Purchase high-integrity carbon dioxide removal directly from Nellie.
Our engineered carbon removal is produced in the UK using our proprietary microalgal systems, with captured carbon converted into durable PhycoChar® biochar for long-term storage.
Carbon removal is available through forward purchases and multi-year offtake agreements, with terms tailored to volume and delivery requirements.
1000 tCOâ‚‚ Annual Capacity
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200+ Year Permanence
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UK Production
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Patented Systems
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1000 tCOâ‚‚ Annual Capacity | 200+ Year Permanence | UK Production | Patented Systems |
We use proprietary biological and mechanical engineering to capture carbon dioxide by producing biomass at speed and at scale. We then process the biomass and direct the captured carbon into durable storage pathways.
Growth
We build photobioreactors and we build them big. Inside them, we have a unique (and patented) set of ingredients and tools that create biomass very quickly. As the biomass grows, it removes carbon dioxide from the gaseous inputs.
Processing
Once the biomass has reached its optimal growth, we remove it from our photobioreactors and process and treat it using a variety of methods to make sure it's suitable for our long-term carbon dioxide sequestration channels.
Sequestration
The processed biomass feedstock is then put through one of several systems to generate either a biogenic aggregate or biochar. This end product is then used in the agricultural and construction supply chains and the captured carbon is stored away.
Trusted to Deliver Carbon Removal.
See what we do.
Our friends at Razor were kind enough to feature Nellie and our carbon dioxide removal systems as part of their recent film on innovative clean technologies.
Have a look at our pilot site and the science behind fixing the climate.
Award Winner 2025
Award Recipient 2024
2024 & 2025 Nominee
Award Winner 2024
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Driven by Delivery.
We’re passionate engineers, scientists and climate technologists.
News and insights on our journey to beyond net zero.
