Wired asks this very important question:

Electric cars, which have come and gone at least twice since the dawn of the automobile era, are back. The first mass-market EVs are here and more are rolling silently over the horizon. The Obama administration loves cars with cords and wants 1 million on the road by 2015.
That’s an ambitious, but not impossible, goal. Most major automakers promise to have an electric vehicle or plug-in hybrid in showrooms by then. Their commitment seems solid, and some are making big promises. General Motors just announced its second plug-in hybrid, for example, and Nissan says its factory in Tennessee will be able to crank out 150,000 EVs annually by 2013. Nissan CEO Carlos Ghosn boldly predicts battery electric vehicles will comprise 10 percent of the global market by 2020.
So where will we plug them in?
This is not an insignificant question, but neither is it the major hurdle some suggest. We’ll plug in mostly at home, often at work and, if we need to, at a growing number of public chargers. Some bet swappable batteries will alleviate our range anxiety, while others envision fleets of quick-charge trucks rescuing stranded drivers. Optimists say we’ll soon see batteries that can take us hundreds of miles, making the issue moot.
“There are a lot of possibilities coming, and it’s not just about home charging, or quick-charging, or removable batteries,” Ghosn told Wired.com. “It’s about a lot of pieces of technology coming together to make charging much easier.”

Well, one place we won’t be plugging in these cars is Costco:

Costco, the membership warehouse-club chain, was an early leader in offering electric-vehicle charging to its customers, setting an example followed by other retailers, including Best Buy and Walgreen. By 2006, Costco had installed 90 chargers at 64 stores, mostly in California but also some in Arizona, New York and Georgia. Even after General Motors crushed its EV1 battery cars, the Costco chargers stayed in place.
Yet just as plug-in cars like the Nissan Leaf and Chevrolet Volt enter the market, Costco is reversing course and pulling its chargers out of the ground, explaining that customers do not use them.
“We were early supporters of electric cars, going back as far as 15 years. But nobody ever uses them,” said Dennis Hoover, the general manager for Costco in northern California, in a telephone interview. “At our Folsom store, the manager said he hadn’t seen anybody using the E.V. charging in a full year. At our store in Vacaville, where we had six chargers, one person plugged in once a week.”
Mr. Hoover said that E.V. charging was “very inefficient and not productive” for the retailer. “The bottom line is that there are a lot of other ways to be green,” he said. “We have five million members in the region, and just a handful of people are using these devices.”

In other news, unicorn advocates are furious that Costco also plans to remove its unicorn-feeding stations. . .