V2G: Smart grids meet electric vehicles is repeating this rosy vision that I think is a crock. Here's the pitch:-
In the future, utilities will pay you to plug in your vehicle. Millions will plug in their electric vehicles (EVs), plug-in hybrids (PHEVs), and fuel cell vehicles (FCVs) at night when electricity is cheap, then during the day when energy is expensive, sell those extra electrons at a profit. Vehicle-to-Grid (V2G) technology is a bi-directional electric grid interface that allows a plug-in to take energy from the grid or put it back on the grid. V2G helps solve the major problem that demand for electricity is high during the day when everything from industrial plants to air conditioning is running full blast and then excess electricity is wasted at night.
The idea keeps cropping up and I think PG&E keeps pushing it. At least the local newspaper has occasional pieces with PG&E doing a dog and pony show trying to convince people that vehicle-to-grid is a great and wonderful idea.
The problem I see with this is the charging time. Peak power demand happens in the middle of the afternoon. During the summer that's when it's hottest outside and therefore when the air conditioners are at their busiest moving heat from inside buildings to the outdoors (making the outdoors even hotter). That makes it likely the power company would tap batteries in EV's in the middle of the afternoon, leaving the EV's unable to drive for several hours later due to the required charging time.
I suppose they figure most EV's would actually be a plug-in hybrid. And that the car engine would fire up to keep the battery topped. And in that scenario the utility would be outsourcing their pollution to PHEV owners who participate in the program.
There's an interesting comment on the article: Just out of curiousity, but why don't we construct buildings with large battery rooms that charge at night to offset daytime cooling/heating requirements? Shouldn't that be a cost-incentive priority for electric companies? Indeed.. so very simple. Why make the battery systems for peak demand be mobile? Why not build them into the infrastructure?