Non Edible oils like Honge Oil (Pongamia), Neem Oil can be used economically as a substitute for diesel in stationary and mobile engines. Unisun Technologies, Bangalore, is currently offering the above mentioned Non-edible oils for industrial usage particularly in captive power DG Sets, where there is no modification required to substitute diesel with these oils.
Rudolf Diesel's prime model, a single 10 ft (3 m) iron cylinder with a flywheel at its base, ran on its own power for the first time in Augsburg, Germany on August 10, 1893. In remembrance of this event, August 10 has been declared International Biodiesel Day. Diesel later demonstrated his engine at the World Fair in Paris, France in 1898. This engine stood as an example of Diesel's vision because it was powered by peanut oil—a biofuel, though not strictly biodiesel, since it was not transesterified. He believed that the utilization of a biomass fuel was the real future of his engine. In a 1912 speech, Rudolf Diesel said, "the use of vegetable oils for engine fuels may seem insignificant today, but such oils may become, in the course of time, as important as petroleum and the coal-tar products of the present time."