EPSEN is an independent consulting and engineering firm, specializing in the energy & ecological transition business. They provide services to solar thermal, on the ground or the roof, individual or collective, biomass wood energy boiler room, on a heating network or autonomous, geothermal energy, recovered energy, waste heat, industrial processes, data centers, wastewater, gray water networks, hybrid systems (diesel) with or without mature, innovative storage, battery, hydrogen, thermal or kinetic storage, coupling of renewable energy production systems and electric mobility solutions (cars, bicycles, scooters).