Are US Power Grids Ready for an Increase in Green Energy?

As the development of renewable power sources increases by leaps and bounds, is America's fragile power grid prepared for new energy from millions of windmills and solar panels? In Golden, Colorado, the Department of Energy has just turned on a supercomputer named Peregrine, which does a quadrillion calculations per second. "Its job is to figure out how to cope with a risk from something the public thinks is benign: renewable energy." That's from a story by Evan Halper in today's Los Angeles Times.