Quarry | The Tekkit Classic Wiki | Fandom
For the Quarry to operate at maximum mining speed, it needs 9 MJ/t, which is just under 2 Combustion Engines running on Oil, outputting 5 MJ/t each, just under one Combustion Engine running on fuel, outputting 10 MJ/t, or 9 Steam Engines, outputting 1 MJ/t each. 9 Redstone Engines at peak efficiency will also work.