As others have said, Force of Thunder is a very nice power that you'll be able to get around level 20, and using it increases your Recovery for 60 seconds (the power itself has a 30 second recharge, making it very easy to always have going). A lot further down the line you can even get Power Sink, and if you still somehow have endurance issues with Force of Thunder, the combined power of that and Power Sink will end your endurance problems for good. I have an elec/elec that's almost 50 now, and endurance basically no longer matters for him.
For some added help, Force of Thunder accepts Accurate Healing IO sets, which means you can put Theft of Essence: Chance for Endurance in it that can give you even more endurance back if enemies are nearby when you use it. Be warned, though: this power sends enemies flying away from you, so if you don't want to bother teammates with it, you should also put Sudden Acceleration: Knockback to Knockdown into it. It's a great tool for blapping and I use it all the time.