Ever noticed those aethercite turning? We all know that aethercite act as beacons for teleporting, but what if they could be used for more?
Aethercite sit in currents of Aether that flow through the Lifestream. This "current" I believe, causes the rotation of the Aethercite. What if the the Aethercite could be reshaped and re positioned to increase rotational speed and torque? The rotational force of the Aethercite could be converted into electrical force by attaching a AC generator to the Aethercite.

Think about it. We could for Eorzea's first electrical company by tapping into the Lifestream!

edit: This couldn't possibly backfire!