Growing Energy Labs Inc., or Geli, has spent the past eight years quietly growing its share of customers using its software platform to control behind-the-meter batteries, solar-plus-storage systems, electric vehicle chargers, and broader building energy usage. In the past year, it has landed new customers in the U.S., Australia and New Zealand. It's also given away its software for free, as part of its bid to become an operating system for grid edge energy management. This week, the San Francisco-based startup raised $5.5 million in financing, its first investment since 2016.