Plug-in hybrid car is essentially a regular hybrid with an extension cord. You can fill it up at the gas station, and you can plug it in to any 120-volt outlet. It's like having a second fuel tank that you always use first -- only you fill up at home, from a regular outlet, at an equivalent cost of under $1/gallon. Plug-in hybrids use no fossil fuel during their all-electric range if their batteries are charged from nuclear or renewable energy sources.
In an all-electric car, high performance batteries store cleaner, cheaper, domestically produced electricity, and an electric motor provides propulsion with zero emissions. In a plug-in hybrid, more batteries than a conventional hybrid allow local all-electric, zero-emission driving with an internal combustion engine for longer distances.
Other benefits include improved national energy security, fewer fill-ups at the filling station, the convenience of home recharging, opportunities to provide emergency backup power in the home, and vehicle to grid applications. The best way to reduce carbon emissions is to utilize the ever cleaner, greener, more renewable grid to power transportation. Only grid-rechargeable cars can attain the end goal of zero-emissions and ensure fuel price stability.