Generates EU from magical items/liquids.
Fuel Type
EU per cell/bucket/item/block
Nether Star/Beacon
100 Million
Ghast Tear
0.5M
Bottle o' Enchanting
10k
Eye of Ender
20k
Ender Eye Dust (GT)
10k
Nether Star Dust/Plate (GT)
50M
Vinteum Gem (GT)
64k
Mercury (GT)
8k + empty cell
Quicksilver (TC4)
16k
Order Shard (TC4)
240k + dull shard
Fire Shard (TC4)
320k + dull shard
Water Shard (TC4)
160k + dull shard
Earth Shard (TC4)
160k + dull shard
Air Shard (TC4)
160k + dull shard
Ignis Essentia (TC4)
80k + empty phial
Praecantatio Essentia (TC4)
80k + empty phial
Potentia Essentia (TC4)
80k + empty phial
Magic Tallow (TC4)
4k
Amber (TC4)
6k
Amber Dust/Plate (GT/TC4)
3k
Blue Orchid (Ars Magica)
16k
Desert Nova (Ars Magica)
64k
Arcane Ash (Ars Magica)
128k
Vinteum Dust/Plate (Ars Magica)
64k
Purified Vinteum Dust (Ars Magica)
512k
Liquid XP (LXP)
20k
Liveroot Block (Twilight Forest)
32k + Stick x4
Liveroot (TF)
16k + Stick x2
Ironwood Ingot (TF)
8k + Iron Ingot
Steeleaf (TF)
24k + Steel Dust
Fiery blood (TF)
2048k
Fiery Ingot (TF)
0.1M + Steel ingot
Note: Thaumcraft 4 fuels are possibly bugged.

Block usage tip : If you have either TC4 or Ars Magica, try to get one as soon as you can.
If you have a mob farm, Liquid XP can be a good way to generate energy.

Recipe:

Magic Energy Convertor Recipe.png
4 Advanced Circuits
2 Platinium Plates
1 Teleporter
1 Beacon
1 Lapatron Crystal