US residential solar and storage provider Sunrun (<a href="https://www.nasdaq.com/market-activity/stocks/run/real-time" target="_blank">NASDAQ:RUN</a>) said on Thursday that its CalReady virtual power plant (VPP) in California has more than quadrupled in size and now includes more than 56,000 customers’ solar-plus-battery systems totalling some 75,000 batteries.