BUSINESS: Moving from the sidelines to the spotlight, commercial energy storage begins to take off Debra Kahn, E&E reporter Published: Wednesday, July 9, 2014 SAN FRANCISCO -- Energy storage is already proving a cash cow for at least one sector of the solar industry. Please subscribe to ClimateWire to read the full story. Username: Password: Forgot your access codes? Recover them. Not a subscriber? Sign up for a trial. Ready to subscribe? Click here.