If you body consumes 2,000 calories a day, that means you are consuming 2.3 kWh a day of energy from food or roughly 96 watts an hour.

That means your body is consuming 856 kWh a year to stay alive. If you could plug your body in the electric grid at 15 cents a kilowatt hour rather then eating food, you could eat for an entire year for $128.40 a year.

But then again, humans stomachs aren’t very efficient at converting food to energy — only about 25% efficient.

Electricity might be converted to work at a much higher rate by theoretical humans in the future — maybe your food bill would be like $30 a year if you could eat electricity rather than food.