We build technologies that fix the climate.

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.

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2025 Nominee

Award Recipient 2024

Award Winner 2024

2024 Nominee

The CORC Shop is Open.

Nellie’s verified Carbon Dioxide Removal Certificates (CORCs) are now available on current, ex-post and future, ex-ante agreements.

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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.

Our first DAC site.

We're operational from our first hybrid DAC / BECCS site located at Mwyndy, South Wales, United Kingdom. Find out more about the technology we’ve built to remove carbon dioxide from the air.

We use proprietary biological and mechanical engineering to capture carbon dioxide by producing biomass at speed and at scale. We then process and sequester this in biogenic aggregate channels.

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 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 for over a thousand years.