Original: First-generation technologies , which are already mature and economically competitive , include biomass , hydroelectricity , geothermal power and heat . Second-generation technologies are market-ready and are being deployed at the present time ; they include solar heating , photovoltaics , wind power , solar thermal power stations , and modern forms of bioenergy .
Simplified: Renewable energy commercialization involves many different technologies , including solar photovoltaics , solar thermal power plants , solar heating and cooling systems , wind power , hydroelectricity , geothermal power , biomass , and ocean energy systems .