As we have now automation upgrade - we have many logical gates to make automation possible, but currently we lack one of most powerful and useful:
Item Filter Gate.
This one provide ability to select resource (item type) with mass threshold, become Active when we have this resource in our colony with this mass amount.
For selecting simplicity selection made similarly as in storage compactors.
This would provide ability to turn on/off power based on amount of specific item we have (or category of items).