Also: geothermal, steam turbine, concentrated solar power, CSP, solar steam
Heat from the Earth or focused sunlight, often used to make steam that drives turbines.
Uses proposed by researchers for this topic are listed on Potential uses.
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Lund and Boyd reviewed direct use of geothermal energy worldwide as of 2015.
As reported in: Lund, Boyd (2016). Direct utilization of geothermal energy 2015 worldwide review. Geothermics. doi:10.1016/j.geothermics.2015.11.004
Abstract only
Zhang, Baeyens and Degrève reviewed concentrated solar power plants and their design.
As reported in: Zhang, Baeyens, Degrève et al. (2013). Concentrated solar power plants: Review and design methodology. Renewable and Sustainable Energy Reviews. doi:10.1016/j.rser.2013.01.032
Ghasemi and colleagues made a porous structure that concentrates heat at the water surface, generating steam under low sunlight concentration while the bulk water stays cool.
As reported in: Ghasemi, Ni, Marconnet et al. (2014). Solar steam generation by heat localization. Nature Communications. doi:10.1038/ncomms5449