Energy is the basic necessity of daily life. Nowadays, dependence on fossil fuels for energy needs is decreasing in numerous countries thanks to the potential of renewable energy to provide sustainable energy to the huge populations of many developing countries who are short of clean, continuous energy. In general, renewable energy can be defined as energy derived from constantly renewed and theoretically inexhaustible natural resources. Fossil fuels, on the other hand, can be described as energy that cannot be renewed and will eventually decline. Therefore, in many developing countries renewable energy is the alternative energy to replace non-renewable energy or commonly known as fossil fuels. Furthermore, according to Sorensen (2004), there is a greater demand for renewable energy sources nowadays due to the uncertainty of rising fuel prices in living expenses. Commonly, there are many types of renewable energy available in our world such as wind energy, biomass energy, solar energy, hydropower and geothermal energy. However, the three main examples of renewable energy are hydropower, solar energy, and biomass energy (refer to Figure 1 in Appendix 1). The first type of renewable energy is hydroelectric power or well known as hydroelectric power. In Greek hydro means water and therefore hydroelectric energy refers to electricity generated using water flowing at high speed. Lutgens and Tarbuck (1992, p. 163) stated that “running water is of great importance to people because we depend on rivers for energy, travel, and irrigation.” The continuous availability of water in the universe has made water the main source of hydroelectric energy. Water has been widely used by mankind since the beginning of civilization, and water...... middle of paper......ch is used to replace natural gas. He further stated that, among the equipment used to burn biofuel, pendant burners have the ability to exceed 99% efficiency and whole-shaft burners can reduce the costs of harvesting and managing wood fuels by about 35% ( Brown, 2003). Furthermore, the long-term use of bioenergy serves to provide a certain degree of ecological balance and climate change, avoid acid rain, reduce soil erosion, and minimize water pollution (Gevorkian, 2007). Therefore, biomass is as environmentally friendly as solar energy. According to research conducted on the synthesis of gas from biomass, the gas gasifies in the internal combustion engine. The relative energy density of synthesis gas is higher than that of fossil fuel under certain conditions. Furthermore, the relative speed of the synthesis gas flame can reduce the spark ignition time.