While some yachts employ wind generators or solar panels, the primary method used to generate electricity aboard a sailing vessel is still a generator powered by an internal combustion engine, like a gasoline or diesel motor.

I wouldn't employ myself to answer this, even were I in a grammarian's employ!

"Southern Electric is based in London and provides service to most of the United Kingdom. They employ more than 20,000 people throughout the United Kingdom."

Adjective forms for the verb to employ are employable and employed.

The verb is to employ (employs, employing, employed).