EnderIO has a Dimensional Transceiver that's basically a tesseract with limited throughput (IIRC) and an RF cost to run.
Chromaticraft also has the World Rift, which is even more flexible than tesseracts. If you happen to be near endgame in Chromaticraft.
Also, if you were using RFTools dimensions instead of Mystcraft ages, you could use a Dimension Builder to pump RF into the dimension you want to power stuff in, then use an Energy Extractor (or whatever that block's called) to pull it back out where you need it. Just be careful to not pull out too much energy.