Events The S&P returned 18.39 during 2020, the OMX Water index returned 20.84% while the Clean Tech Index surged 52.51% and the Russell 2000 was up 19.93%.[i] Enphase Energy, a manufacturer of inverters, led the Clean Tech Index with a 571% return. Blink Charging, an operator of EV charging stations, returned over 2000 times last …