by selling electricity back to the grid the cars can ease peak electricity demand

The $1 million investment in the so-called “vehicle-to-grid” technology was masterminded by Google’s philanthropic division, Google.org, and will ultimately include a 100-strong fleet of plug-in hybrids operated by Enterprise Rent-A-Car.

Google’s new 1.6megawatt solar power facility – the largest such system in the United States