Despite recent explosive growth rates, the wind and solar power industries must overcome key innovation challenges before they can contribute a substantial share of national or global energy supplies, a panel of leading technology experts said today in Washington DC. Speaking at the Energy Innovation 2013 Conference organized by the Information Technology and Innovation Foundation and the Breakthrough Institute, Armond Cohen of Clean Air Task Force, Fort Felker of the National Renewable Energy Laboratory (NREL), and Minh Le of the Department of Energy's SunShot Program each stressed that taking solar and wind to scale starts with taking a "cold,