It might always be a lot easier to find one and two it, than it will be to manufacture one in terms of total energy output. Imagine a far future with mature gra

It might always be a lot easier to find one and two it, than it will be to manufacture one in terms of total energy output. Imagine a far future with mature gravitational and neutrino astronomy, and good AI. You could send a fleet of drones to search for black holes that met your criteria, establish orbit, then send for help from a "tug". The biggest use for a black hole would be dropping garbage into it and harvesting some of the energy.