Reuters: Energy storage is an unglamorous pillar of an expected revolution to clean up the world’s energy supply but will soon vie for investors attention with more alluring sources of energy like solar panels, manufacturers say. "It’s been in the background until now. It’s not sexy. It’s the enabler, not a source of energy," said Tim Hennessy, chief executive of Canadian battery makers VRB Power, speaking on the sidelines of a "CleanEquity" technologies conference in …