Currently if you have a blueprint with power poles in it the connections for the copper cables are not saved within the blueprint. Could I suggest that they - well are saved as well (like the circuit wires). I know it is more of a visual feature but it drives me nuts when I turn on the power wires in the map and they are all over the place - sorry it is how it is I guess. Right now I place a blueprint and spend quite a time to remove and reset the power cables again. Also if you have a blueprint which makes disconnected electric networks it is better to build it by hand compared to use a blueprint.
Just a suggestion I can live without it, but maybe someone else has the same issue and you would have made two people happy
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have fun
Case