Better would be turning radiation directly into electricity.
Solar Panels, thermoelectric devices.
Don't forget Radio Thermoelectric Generators like what's powering the Cassini probe in Saturn's orbit right now (along with the Voyagers, the old Viking Mars landers, and many more space probes).
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As I read it, the issue is converting that heat into electricity via a steam turbine.
On the bright side we could be headed to a steam punk era of cars!
Better would be turning radiation directly into electricity.
However we have fuel cells which covert gases into electricity. Gotta love the redox (oxidation and reduction)!