This subject is also known as Vehicle to Grid technology, or V2G... I quickly located these three links to the subject, including one that was posted just yesterday that continues the discussion of the efforts being made in Australia...
To quote from the recent article:
The ACT project's research leader, Bjorn Sturmberg from the Australian National University, said the trial would assess how well a car fleet could balance supply and demand across the network.
"When electric cars are plugged in, they could be called on in a heartbeat to avoid a mass power outage," Dr Sturmberg said.
"They'll only have to do this a couple of dozen times a year — when there's a storm or some other emergency in the grid — which means the grid needs power really quickly.
"The batteries in the electric vehicles can then inject power in a fraction of a second."
Can your Electric Car be Used to Help Power the Grid? A Southern California Edison demonstration project explores whether EV batteries are a viable resource to help power the electrical system.
energycentral.com
With Vehicle-to-Grid (V2G) technology, we are stabilizing the power grid and shaping the future of energy management.
www.mobilityhouse.com
Fifty one vehicles in Canberra will be part of a trial — the first of its kind in Australia — to gauge how well car batteries can stabilise the electricity network against damaging surges.
www.abc.net.au