Basic Action Super Heroes!

I was thinking of allowing players to buy more Energy with exp (within reason) and having differenet levels for minions/villains etc perhaps. This is mainly to do with allowing players to use their psi abilities more often, however as Energy is obviously stamina related as well and so I feel I might run into a few problems.

I was thinking of perhaps having possibly two Energy pools, one that's stamina related with a max of 10 and one for psi abilities which is interlinked with this but could go a little higher - however, I'm not sure how I'd implement it.

If that makes sense to anyone, do they have any ideas?

thanks

I think this may be an easy way to handle it- whether it is for Physical or mental energy:

New Mundane Power: Improved Endurance 1-5pts
You have an increased capacity to withstand fatigue. Each point in this power increases your maximum Energy Pool by 2 points. Thus, if you have Improved Endurance 2, you would have an energy pool of 14 instead of 10.

I think that's very useful for improving the max energy as a whole. What though if I wanted to increase energy use for only psi powers and not other endurance feats?