Small visual glitch. The Power tap appears not connected to Restone energy conduits from TE upon world load. The energy is generated and drained properly so I think this is just a visual bug.
Screenshot: http://img855.imageshack.us/img855/656/mnjv.png
Using TE 3.0.0b9e and Big-Reactor 0.2.7A2 MC1.6.4 Forge 953

Good timing - I literally just checked in a fix for this five minutes ago. :)

This will be fixed in 0.2.8A.