Biochar for Kenyan Smallholder Farmers: What It Is and How You Actually Benefit

Biochar is the most commercially advanced carbon removal method operating in Kenya today. It is real, it is funded, and it is already at scale — one Mt Kenya producer announced a deal with Microsoft described as the largest single purchase of biochar carbon removal from an African project.

But there is a common misunderstanding worth clearing up immediately. Most Kenyan farmers will not earn carbon credits from biochar. They will benefit from it — genuinely, and in a way that shows up in their yields — but as buyers of a subsidised soil amendment, not as sellers of carbon. Understanding that distinction before you engage with any scheme will save you disappointment.

This guide explains what biochar is, what it does to soil, how the Kenyan model actually works, and what to ask before signing anything. Read it alongside our Carbon Farming in Kenya pillar guide.

Agrosocial Services is an independent agricultural certification and compliance consultancy. We are not a carbon project developer, a biochar producer, or a credit buyer.

The Basics

What Biochar Actually Is

Biochar is a carbon-rich material produced by heating organic matter in the absence of oxygen — a process called pyrolysis. The feedstock is agricultural waste: crop residue, waste wood, husks. One Kenyan producer runs the process at 550 to 700°C.

Burning that same waste in the open releases its carbon straight back to the atmosphere. Leaving it to rot does much the same, more slowly. Pyrolysis instead converts it into a stable solid that can remain in soil for more than a thousand years.

That permanence is the commercial point. As our guide to MRV explains, soil carbon from farming practices is difficult to measure and slow to accumulate. Biochar is different: the carbon is in a physical product, the quantity can be weighed, and the storage is durable. Measurable and permanent is exactly what a corporate buyer wants.

Agronomic Value

What Biochar Does to Soil

Set the carbon market aside for a moment, because the agronomic case stands on its own. Applied at 2 to 5 tonnes per hectare, biochar improves:

• Water retention — its porous structure holds moisture, which matters increasingly as rainfall becomes less reliable.
• Nutrient holding — it reduces leaching, so fertiliser you apply stays available to the crop for longer.
• Crop yields — the practical outcome of both.

Kenyan field research has examined this directly, including published work on maize grain yield responses to realistic biochar application rates on smallholder farms in Kenya. The qualifier “realistic” matters — trial results at high application rates are not always achievable on a smallholding, and you should treat any yield promise with the same caution you would apply to a fertiliser claim.

In practice, biochar is rarely supplied alone. It is typically blended with compost, manure or other organic nutrients into a biofertiliser — which is how most Kenyan farmers will encounter it.

The Part Nobody Explains

⚠️ Who Actually Earns the Carbon Credits

Here is how the Kenyan biochar model actually works, stated plainly:

This is a legitimate and genuinely useful model. Farmers get an effective soil amendment at below commercial cost, agricultural waste is put to use, and real carbon is removed. Nobody is being cheated.

But be clear about what you are receiving. A discount on an input is not the same as a share of carbon revenue. If someone offers you “biochar carbon credits,” ask precisely who holds the credit, who sells it, and what share reaches you — the same questions we set out in how farmers actually get paid.

On the Ground

What’s Actually Operating in Kenya

Unlike much carbon farming talk, Kenyan biochar has real facilities producing real volumes:

A Mt Kenya operation works through partnerships with large regional agribusinesses, taking waste that would otherwise be burnt or left to rot — including waste wood and macadamia husks — and converting it to biochar. That biochar is blended with compost manure into an organic fertiliser sold to smallholders at subsidised rates, funded by carbon credit proceeds. The facility has passed audit and reports to the Puro registry. Having raised USD 1.3 million, it targets 100,000 tonnes of CO₂ removal annually with additional Kenyan sites planned. Its 2023 Microsoft deal was described as the largest single purchase of biochar carbon removal from an African biochar project.

A second Kenyan operation centralises agricultural residues under a project expected to remove approximately 33,125 tonnes of CO₂ equivalent over its first five years, operating pyrolysis at 550–700°C.

The Farm-Level Route

Making Biochar Yourself

There is a second route that does not depend on any company: pyrolytic cookstoves, which produce biochar as a by-product of cooking.

The benefits stack usefully for a rural household:

• Reduced fuel demand — relevant where most smallholders still depend on wood.
• Less indoor smoke exposure — a genuine health gain, and one that falls mainly on women and children.
• Biochar for your own soil, at no additional cost.
• Eased household labour traditionally borne by women.

Kenyan subsidies for biochar production have been credited with improving fuel efficiency, reducing indoor smoke exposure and helping mitigate soil degradation.

The honest limitation: volumes from a cookstove are small. Against a 2–5 tonne per hectare application rate, household production will treat a modest area over time, and it is generally too small to generate saleable credits alone. Treat it as free soil improvement plus a health benefit — not as a carbon income stream.

Market Context

Why Buyers Prefer Biochar

Understanding why corporates pay well for biochar removals helps you judge any offer put to you:

• It is measurable. Biochar is a physical product that can be weighed — unlike soil carbon, which must be sampled, modelled and discounted for uncertainty.
• It is durable. Storage exceeding a thousand years compares favourably with practices that can be reversed by a single season of ploughing.
• It is removal, not avoidance. Carbon is taken out of the atmosphere rather than emissions merely being prevented — a category buyers increasingly prioritise.
• It is verifiable. Facilities pass audit and report to registries; the chain of evidence is straightforward.

Those same qualities are why the credits command a premium — and why it is worth knowing where that premium ends up.

Due Diligence

Questions to Ask Before You Sign

• Am I buying a product or selling carbon? Get this clear first — it determines everything else.
• If I supply feedstock, am I paid for it, and does that payment reflect its value in the credit?
• Who holds and sells the credit, and what share reaches farmers?
• What does the biochar fertiliser cost me against comparable commercial inputs?
• What application rate is recommended for my crop and soil, and what yield response has actually been observed locally?
• Is the project registered and audited, and with which registry?
• What am I committing to, and for how long?

Quick Answers

Frequently Asked Questions