Peak of Eternal Light

"Peak of Eternal Light (PEL) describes a point on a body within the Solar System which is eternally bathed in sunlight. This is due to both the bodies' rotation and the point's altitude. The existence of such peaks was first proposed by Camille Flammarion in 1879, who speculated that there may exist pics de lumière éternelle at the poles of the Moon. Peaks of Eternal Light would be advantageous for space exploration and colonization due to the ability of an electrical device located there to receive solar power regardless of the time of day, and the relatively stable temperature range."

http://en.wikipedia.org/wiki/Peak_of_Eternal_Light