Can electric vehicles reduce electricity bill?

In this paper, the use of the electric vehicle (EV) battery to supply part of the electrical load of the house (when the EV is parked at home) during on-peak hours under time-of-use (TOU) electrical tariff is shown. The EV battery is charged by buying electricity from the AC grid during off-peak hours (at low price), and during on-peak hours (at high price), the battery can supply the whole load or a part, avoiding the purchase of expensive electricity from the AC grid. This use of the battery can be compatible with the normal use (supplying electricity to the wheels of the EV) and can help to reduce the electricity bill.