Data calculated for State of the Tropics report from original source: U.S. Energy Information Administration International Energy Statistics (http://www.eia.gov) Energy resources that are naturally replenishing but flow-limited. They are virtually inexhaustible in duration but limited in the amount of energy that is available per unit of time. Renewable energy resources include biomass, hydro, geothermal, solar, wind, ocean thermal, wave action, and tidal action (Billion Kilawatt hours).