Lightrock, a global growth equity investor, led a $150m Series E round in Mainspring Energy, an onsite power generation provider, with participation from Khosla Ventures, Bill Gates, Fidelity Investments, Princeville Capital and Lineage Ventures. "Mainspring's radical flexibility in clean power generation — the ability to operate multiple fuel types, to turn on and off rapidly, to be placed anywhere, easily and affordably — has the potential to demonstrably speed the world's move to zero-carbon electricity. Lightrock invests in companies that can deliver significant, measurable climate impact, and Mainspring fits ideally into our portfolio, which also includes innovators in fields such as hydrogen electrolysis and biogas conversion," Kevin Bone, Lightrock Partner.