A metering device that allows the two-way exchange of electrical energy between the
power grid and electric vehicles by giving customers the option to upload electrical energy from their vehicle's electrical power
system to the
power grid or to another vehicle, or the option to download electrical energy from the
power grid or another vehicle, to charge their vehicle's electric storage
system, depending on the current market price of
electricity. This allows users to both buy and sell
electricity as a commodity to offset their fuel costs and to generate income. The metering device and the associated
server may maintain a
database of the user's preferences and identification. The metering device may allow customers to upload and sell
electricity from their vehicles during peak, high cost,
energy consumption periods, download and buy electricity to their vehicles during low energy, low cost, consumption periods, or algorithmically engage in bi-directional transfer depending on the user's preferences and other variables (see [0043]) in order to maximize the customer's monetary returns and minimize the customer's monetary expenses.