After some remembering the good ol'days when i was a little runt ship and spamming that energy cube mission I had a brain storm.
The idea has been touched on before and we have the framework for it with the daily missions but how about we get a daily mission that shows up around rank 100ish named along the lines of "energy compression" a daily mission that you run thru that the energy cost is determinate by how much your max energy without relays, it gives hardly any exp and in the end you would get a energy cube as a reward for finishing.
As I see it this would be rather ideal for when you got extra energy to waste but don't want to use it, just put a little into the mission and make a cube for later use.