Board Thread:Questions and Answers/@comment-189.7.66.227-20131110012725/@comment-13413401-20131111215518

Well, you have two options. Both of them are kind of expensive. Option 1 is easier but a bit more expensive than option 2.

1) Use energy conduits. These will never expload because they only take the amount of power required by the machine.

2) Use buildcraft gates. Just place a basic gate next to the machine on the energy pipe, and set it so: "We has work, output redstone signal". Then run some redstone from the gate to your engine. So now, when there is work for the machine to do, the engines will recieve a redstone signal and turn on. When the machines are done, the engines will stop recieveing redstone and turn off.

Make sure you set the engine to turn on with redstone signal.

If you want to conserve space, you can do option #2 with pipe wire, but thats more complicated and requires 2 iron gates...