What kind of energy are you talking about? Black holes don’t emit anything.
—
Actually they do - plasma steams are often emitted (numerous false color shots of galaxy centers emitting huge light year long plasma streams).
But then you’d need to have the right sort of apparatus to harness the energy of their rotation. I know were you can get one, if you are interested, for just a slight finder’s fee payable to my off-shore account.
Yeah, I’m interested. Let’s set something up!
Just as long as this apparatus isn’t made in England. I’m sure it will leak oil.