Quarry Tekkit Wiki
For the Quarry to operate at maximum mining speed, it needs 9 MJ/t, which translates to 2 internal combustion engines running on fuel (outputting 5 MJ/t each), or 9 steam engines (these put out 1 MJ/t). As the Quarry has only 4 sides free to attach engines to, one way to power a Quarry is to place 4 Steam Engines on all 4 sides.