- In a northern Tunisian olive grove, Yassine Khelifi’s small workshop hums as a large machine turns olive waste into a valuable energy source in Sanhaja, Tunisia, a country heavily reliant on imported fuel.
- Khelifi began developing his idea in 2018 after he travelled across Europe searching for a machine to turn the olive paste into long-burning fuel.
In a northern Tunisian olive grove, Yassine Khelifi’s small workshop hums as a large machine turns olive waste into a valuable energy source in Sanhaja, Tunisia, a country heavily reliant on imported fuel.
Holding a handful of compacted olive residue — a thick paste left over from oil extraction — Khelifi said: “This is what we need today. How can we turn something worthless into wealth?”
For generations, rural households in Tunisia have burned olive waste for cooking and heating or used it as animal feed.
The International Olive Council estimated Tunisia will be the world’s third-largest olive oil producer this year, with an expected yield of 340,000 tonnes. The waste generated by the oil extraction is staggering.
Khelifi, an engineer who grew up in a family of farmers, founded Bioheat in 2022 to tackle the issue. He recalled watching workers in olive mills use the olive residue as fuel.
“I always wondered how this material could burn for so long without going out,” he said. “That’s when I asked myself: ‘Why not turn it into energy?'”
Beyond profit, Khelifi hopes his startup helps “reduce the use of firewood as the country faces deforestation and climate change”.
At his workshop, employees transport truckloads of olive waste, stacking it high before feeding it into the processing machines.
The material is then compacted into cylindrical briquettes and left to dry for a month under the sun and in greenhouses before its packaging and sale.
Khelifi began developing his idea in 2018 after he travelled across Europe searching for a machine to turn the olive paste into long-burning fuel.
Unable to find the right technology, he returned to Tunisia and spent four years experimenting with various motors and mechanical parts. By 2021, he had developed a machine that produced briquettes with just eight per cent moisture.
He said this amount significantly reduces carbon emissions compared to firewood, which requires months of drying and often retains more than double the amount of moisture.
Bioheat found a market among Tunisian restaurants, guesthouses, and schools in underdeveloped regions, where winter temperatures at times drop below freezing.