Scientists had considered offshore wind as a potentially limitless source of power.

A finite number of spells against a near- limitless source of energy?

Every one would have his own limitless source of energy.

There is a virtually limitless source of fuel in the world's oceans to feed future nuclear fusion reactors.

Found in plant cell walls, it's the most abundant naturally occurring organic molecule on the planet, a potentially limitless source of energy.

It was a roaring torrent all year; it was one of the things that made Anvegad impregnable, a limitless source of water and power.