Haffner Energy received an investment from Mundi Énergies
Clairfield acted as exclusive financial advisor to Haffner Energy on a private placement subscribed by Mundi Énergies.
The parties
Haffner Energy is a French cleantech company that designs and supplies proprietary biomass thermolysis systems. Its technology converts biomass residues into renewable gas, hydrogen, renewable methanol, and sustainable aviation fuel. Alongside equipment supply, the company supports industrial and public sector clients as they develop biomass to energy, methane, and renewable diesel projects.
Marc and Philippe Haffner founded the business in 1993 in Vitry-le-François, where it is still headquartered, with additional sites in Paris, Nantes, and Houston. Haffner Energy has been listed on Euronext Growth Paris since 2022, and a stable founding family investor base controls it.
Mundi Énergies is based in Manseau, Quebec. It develops multi-energy hubs that convert residual agricultural and forestry biomass into renewable natural gas, renewable diesel, and power for Canadian markets.
Outcome
Mundi Énergies subscribed to a private placement in Haffner Energy. The investment turns the technology partnership the two companies signed in December 2025 into a long-term industrial and equity partnership.
The deal gives Haffner Energy a committed industrial partner in Canada, a market with abundant biomass feedstock and strong support for decarbonising agriculture and forestry. It also gives Haffner Energy’s thermolysis technology an accelerated route to scale.
Clairfield’s role
Clairfield acted as exclusive financial advisor to Haffner Energy on the transaction.
Energy, cleantech & resources

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Advisor to Haffner Energy
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