Most generators use 1 energy point and 1 charge to generate 1 item. When a generator runs out of charge it will start recharging after which you'll be able to tap the generator to create items without having to pay gems.
Most generators use 1 energy point and 1 charge to generate 1 item. When a generator runs out of charge it will start recharging after which you'll be able to tap the generator to create items without having to pay gems.