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Answer for the clue "Device that generates solar power ", 9 letters:
heliostat

Word definitions for heliostat in dictionaries

Wiktionary Word definitions in Wiktionary
n. A device that includes a plane mirror which turns so as to keep reflecting sunlight toward a predetermined target, compensating for the sun's apparent motions in the sky. The target may be a physical object, distant from the heliostat, or a direction ...

Wikipedia Word definitions in Wikipedia
A heliostat (from helios , the Greek word for sun , and stat , as in stationary) is a device that includes a mirror, usually a plane mirror , which turns so as to keep reflecting sunlight toward a predetermined target, compensating for the sun's apparent ...

The Collaborative International Dictionary Word definitions in The Collaborative International Dictionary
Siderostat \Sid"er*o*stat\, n. [L. sidus, sideris, a star + Gr. ??? standing, fixed, fr. ???? to place.] (Astron.) An apparatus consisting essentially of a mirror moved by clockwork so as to throw the rays of the sun or a star in a fixed direction; -- a ...

Usage examples of heliostat.

It was actually bright here, the sunlight deflected into the crater by heliostats, giant mirrors perched on the rim mountains or on impossibly tall gantries.

And suspended there at the end of the first pipe lengths she could see the drill head itself, teeth of tungsten and diamond gleaming in the lights of the heliostats.