Biochar Industrial Group (BIG), a Nairobi-based climate-tech startup, has closed a $1.5 million pre-seed round to scale its agricultural waste-to-biochar operations across Africa, according to TechCabal and Techpoint Africa. The raise positions BIG at the intersection of Africa's chronic farm-waste problem and the global voluntary carbon market's mounting appetite for durable, measurable removal credits.
BIG's core process takes crop residues — maize stalks, rice husks, sugarcane bagasse — that farmers would otherwise burn, and pyrolyzes them at high temperatures in the absence of oxygen to produce biochar. The resulting material is incorporated into agricultural soil, where it sequesters carbon for centuries rather than years. That durability is precisely what distinguishes biochar credits from cheaper, lower-permanence forestry offsets that have faced intense scrutiny from corporate buyers and standards bodies alike.
The $1.5 million will be deployed toward building and deploying additional pyrolysis units across East Africa, expanding the company's farmer network, and acquiring the certification infrastructure needed to issue verified carbon removal credits, WeeTracker reported. The company operates a dual revenue model: selling biochar directly to farmers as a soil amendment and selling the associated carbon removal credits to buyers in Europe and North America seeking high-quality, long-duration offsets.
The investor lineup for the round was not fully disclosed across the sources reviewed, though the raise reflects growing early-stage interest in Africa's nascent carbon removal sector. BIG's model is notable because it aligns smallholder farmer incentives — reduced input costs and potentially higher yields from improved soil — with the climate goals of international credit purchasers, creating a supply chain that is harder to game than forestry-based alternatives.
The backdrop matters enormously here. Africa generates hundreds of millions of tonnes of agricultural residue annually, much of it burned in open fields — a practice that releases CO₂, black carbon, and other particulates while degrading soil fertility. BIG's pitch is that pyrolysis converts that liability into a durable asset: a tonne of biochar locks away roughly 2.5 to 3 tonnes of CO₂-equivalent for potentially thousands of years, according to peer-reviewed estimates, though precise figures depend on feedstock and process conditions.
The voluntary carbon market has been under pressure. Major rating agencies and investigative journalists have questioned the integrity of avoided-deforestation credits, leading large corporate buyers — including several European energy firms — to shift procurement toward removal credits with measurable, physical permanence. Biochar sits in the highest-permanence tier alongside direct air capture, but at a fraction of the cost: biochar credits trade in the range of $100–$200 per tonne, versus $300–$1,000-plus for engineered removal. That cost gap is why startups like BIG are attracting pre-seed capital despite the market turbulence.
BIG's challenge at this stage is throughput. Pyrolysis units are capital-intensive, and scaling from pilot to commercial volumes requires not just hardware but logistics networks capable of aggregating dispersed crop waste from smallholder plots that are often less than two hectares in size. The $1.5 million is a starting point, not a finishing line — the company will almost certainly need a Series A within 18 to 24 months if it intends to reach the production volumes that make certification economics viable.
Why it matters: With Africa holding the largest share of the world's agricultural waste and the least-developed carbon removal infrastructure, BIG's raise — small as it is — tests whether a vertically integrated biochar model can turn a continental inefficiency into a credible, revenue-generating climate asset before better-capitalised competitors from Europe and the US establish the playbook first.