When "saving and exiting" and then logging back in, the MFE/Batbox needs to be reset with a wrench each time to get power flowing again. I was told to post this here after talking on the chat.
[Bug][IC2 v. 1.95b][SMP] MFE/Batbox needs to be reset after logout
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I'll add a console message to indicate which electric tiles failed to register with the energy network, thus unable to transmit power.
In other words, known bug.