Get power consumption of a single block

Is there any way to do this? I know that it was not possible a few months back, but since then the way you access the power from a programme has been reworked and this might have changed things.

The only way I can think of right now is to get the output of all batteries, solar panels and reactors and see whether that value changes when you switch the block on and off, and I really don't want to do that.