Electric-car, battery, and solar company Tesla Motors (NASDAQ: TSLA) took a key step this week in advancing its nascent energy storage business when it celebrated the world’s largest lithium-ion storage installation at electric utility Southern California Edison’s Mira Loma substation. But despite its unprecedented scale, Tesla chief technology officer JB Straubel said the project is “just the tip of the iceberg in the future of how much storage we are going to see on the grid.”