Duo turns greasy kitchen air into clean energy – lands fresh funding from H&M heir
11 sep. 2025
14:13
Sweden-based cleantech company Enjay has developed technology that captures heat from greasy restaurant exhaust air and transforms it into usable energy.
Now, the company has raised fresh capital from H&M billionaire Karl-Johan Persson’s investment firm, while pivoting towards a new business model.
Now, the company has raised fresh capital from H&M billionaire Karl-Johan Persson’s investment firm, while pivoting towards a new business model.
Turning burger fumes into clean power might sound like sci-fi. But the Swedish-based firm Enjay has actually cracked it. The cleantech company has built a system that captures heat from greasy restaurant exhaust air — the kind that normally wrecks conventional heat exchangers — and turns it into usable energy.
The invention, dubbed Lepido, started out in a trial with Burger King in Malmö. "All customers and technical consultants agreed there simply was no product that could handle it. People turned a blind eye and released enormous amounts of energy straight into the air," says CEO Jesper Wirén, who co-founded the company together with Nils Lekeberg. Since then, Enjay has rolled out around 150 projects across the fast-food sector.