ICYMI Vermont utility Green Mountain Energy used 500 residential @Tesla Powerwalls to send energy to the grid during July heat wave. Saved GMP $500K. GMP to deploy another 1,500 Powerwalls to add to their virtual power plant. $TSLA https://utilitydive.com/news/tesla-batteries-save-500k-for-green-mountain-power-through-hot-weather-pea/528419/…