helioelectric

As a proper noun sun

is the star that the Earth revolves around and from which it receives light and warmth.

As a noun sun

is a star, especially when seen as the centre of any single solar system.

As a verb sun

is to expose to the warmth and radiation of the sun.

As an adjective helioelectric is

describing electric power generated by the rays of the sun.

As a noun power

is a button of a computer, a video game console, or similar device, that when pressed, causes the device to be either shut down or powered up.

As an adjective helioelectric is

describing electric power generated by the rays of the sun.

As adjectives the difference between electric and helioelectric

is that electric is electric while helioelectric is describing electric power generated by the rays of the sun.