A method for managing energy in a controllable device includes determining a plurality of future energy prices, where each of the future energy prices represents a price of a unit of energy over a predetermined time period, determining a duration to charge a controllable device, correlating the duration to charge the controllable device with at least one predetermined time period based at least in part on the price per unit energy over the at least one predetermined time period, and directing a utility to charge the controllable device at the at least one predetermined time period.