Renewable Resource??Renewable energy sources come from natural sources and can be replenished. Examples of renewable sources are: biomass (wood, wood waste, municipal solid waste, landfill gas, ethanol and biodiesel), water (hydropower), wind and solar. Except for hydropower, they are all derived from the sun.More than 150 years ago, wood supplied up to 90 percent of the nation’s energy needs. As the use of coal, petroleum and natural gas expanded, the United States became less reliant on wood as an energy source. Today, coal, petroleum and natural gas account for 83 percent of the nation’s energy consumption. In 2009, consumption of renewable sources in the United States totaled 7.7 quadrillion Btu—or about 8 percent of all energy used nationally.