OK, I've been messing with this for hours but can't get my Tesseracts to send power. I have made sure they are tuned to the same frequency, both enabled and configured for sending/receiving power. I tried redstone energy conduits, placing them next to redstone cells which were configured correctly to input/output and nothing works...
I did manage to send items over these Tesseracts, so apparently I crafted and placed them right, but no power.
There is almost no documentation about this new type of Tesseract, perhaps this is a bug?