important challenges. The storage and transportation of hydrogen is probably its most major challenge, which we will not discuss in-depth at this time. Hydrogen gas is a low btu-value fuel, with about 270 btu per cubic foot, when it is in a gaseous state. As a comparison with natural gas, which has approximately 1029 btu per cubic foot of gas, hydrogen has about one fourth of the btu’s. As a result, in order to produce our objective power levels, we have found it necessary to increase the displacement in our largest engine to 9.4 liters. This was necessary, plus the use of electronic injection, to get enough hydrogen into the engine to achieve higher power levels. www.cleangreenengines.com/banners-view/renewableenerg/