Tesseracts are part of Thermal Expansion, so you can find the settings in:
config/cofh/thermalexpansion.cfg
The specific settings you're looking for are probably:
B:transport.teleport.energy=true
B:transport.teleport.items=true
B:transport.teleport.liquid=true
Which you could adjust as you prefer.
However, there's also settings like:
I:transport.teleport.energy.maxTransfer=100
Which seems to allow limiting how many mj can flow through an Energy Tesseract (if you don't want to ban them altogether, just nerf them a bit).