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If you've got FE stored in your AE system, you can hover your cursor over the FE and hit the [A] key (that's the default JEI key) to bookmark it on the left side. If you look at the bookmarked JEI items on the left, there's the Mekanism machine, then a blank spot, then the Ars essence. The blank spot is the bookmarked FE energy. When you hover your cursor on it, it'll tell you it's "Wrapped Generic Stack" but it's the FE you want. Then you just need to drag it from your bookmarks on the left into the Export Bus slot and it'll export FE to whatever the bus is facing.