There was a time, not long ago, when the future of electricity generation looked something like the opening scene of Bladerunner 2049, with endless arrays of mirrors in concentric circles. Loading Concentrated solar power (CSP) uses mirrors to focus heat from the Sun to drive a steam turbine and generate electricity. While CSP was once the great hope for replacing coal and gas-fired generation, it's now generally considered to have been eclipsed by cheaper forms of renewable generation, like solar panels and wind turbines. Recently, however, it's been making a quiet comeback. The reason for this boils down to three...