Greenhunter Biofuels, a subsidiary of Greenhunter Energy (GRH) announced its biodiesel has been approved by the EPA, allowing the company to sell to the US on road market.  The approval greatly increases biodiesel distribution capabilities in the US from its 105 million gallon/year refinery in Houston, Texas, the largest biodiesel refinery in the country.  Most of the biodiesel the company currently produces comes from animal fats but its jatropha plantations are expected to begin contributing about half of the biodiesel production in 2-3 years