Geothermal alternative (5)
I believe the answer is:
solar
(Other definitions for solar that I've seen before include "Concerning the sun" , "Powered by the sun" , "Sort of power" , "Sun-powered" , "like a star" .)
I believe the answer is:
solar
(Other definitions for solar that I've seen before include "Concerning the sun" , "Powered by the sun" , "Sort of power" , "Sun-powered" , "like a star" .)