There are many ways to get energy in the game. ⚡ Energy refills with time and fully restores when you level up. 🔥Putting fires out gives you 5 energy points each time, helping neighbors in their cities gives 1 energy point per neighbor. .
Once you get low enough on energy then you can ask your friends for it as well. You can also buy more energy for superbucks once you run out. there will be a pop up asking if you want to buy more.
Also when you call your sleeping neighbors back and they return you receive energy supplies as well.