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The raw energy sources that Jacobson found to be the most promising are, in order, wind , concentrated solar (the use of mirrors to heat a fluid), geothermal, tidal , solar photovoltaics (rooftop solar panels ), wave and hydroelectric. He recommends against nuclear, ….. New sources like wind , solar ,and tidal require a large increase in utility rates.Quite simply the costs of renewable machinery and the replacement or removal of existing power plants remains largely unknown.