Over $2.8 billion of VC dollars has poured into energy storage systems (ESS) over the past six and half years. Yet only in 2015 did the industry finally ramp up into an exponential growth trend. Why? Besides technological improvement and growing economies of scale, the major linchpin responsible in unlocking the full value of ESS has only just begun to develop. Growth Energy Labs Inc. (Geli) is one San Francisco based early-stage startup (post-Series A) that has built the key software enabling the new ESS renaissance. Here is why they are a cleantech company to bet on.