The AeroGarden is able to efficiently use only a small amount of electricity each day. The actual cost of electricity will depend on a few variables like your local rates, on and off-peak times you choose to run the machine and the size of the AeroGarden you choose. Bigger models like the Farm12 use more light which will increase the electricity used. In most cases you can run an AeroGarden for only pennies a day. A small price to pay for fresh herbs and vegetables!