Why could lunar polar regions provide nearly continuous solar power?

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near and far sides of Earth's Moon — Moon (Left) Near side of Earth's Moon, photographed by the Galileo spacecraft on its way to Jupiter. (Right) Far side of the Moon with some of the near side visible (upper right), photographed by the Apollo 16 spacecraft.

The lunar polar regions can provide nearly continuous solar power because the Moon’s axis is nearly perpendicular to the plane of the ecliptic. This orientation causes sunlight to remain horizontal at the poles. Consequently, a solar collector positioned on a high peak near a lunar pole can track the Sun and receive essentially uninterrupted electric power.1