Ethylene is a potent - but slow - energy source. When burned in a Gas-Burning_Generator it is producing 300 RF/t.
Use your prefered source of Bio-Fuel (i.e. Rotten Flesh, Seeds, Wheat) that is processed by a Crusher and Hydrogen from a Electrolytic_Separator to produce Ethylen. Then burn it in a Gas-Burning_Generator.
One Electrolytic Separator produces just enough Hydogen for a 3x Speed PRC. For feeding this you need a 5x Speed Crusher with a constant supply of Bio-Fuel ingredients. The amount of Ethylene produced is enough for approx. 70 Generators which equals 21000 RF/t. Be aware, that the Ultimate Universal_Cable can only cope with 12800 RF/t.