Energy regenerates over time, especially usefull over night. If you go to sleep, you will find a completetely filled energy bar in the next morning. In addition to that you get a bunch of energy refills from daily quests. 

The maximum energy also increases with your account level. Energy is only a problem when you start the game, later on, the real life time to spent all this energy is a much bigger problem. A lot of accounts sit on 10k energy and more.

o, ok! cheers, good info. 

or me  it's a  huge  pain in  the  a***  infeel  once you  hit  rank  50  you  should  get  400-500  energy .  120  is  WAY  to  low  for people  who  grind  to  rank 50.

I don't see any ftp player sitting on 10k energy when a single dungeon run costs 16-20....at best as an endgame player you get 3-4 refills. That's 20 dungeon runs, maybe 100 minutes or less on auto. Netting you probably not a single usable item.