Exhibit 99.1 Sunrun Reports Fourth Quarter and Full Year 2023 Financial Results Storage Capacity Installed of 219.7 Megawatt hours in Q4, exceeding guidance range and representing 154% year-over- year growth Nationally, storage attachment rates hit 45% of installations in Q4; recent storage attachment rates have reached ~48% on new sales Solar Energy Capacity Installed of 227.1 Megawatts in Q4, reaching 6.7 Gigawatts of Networked Solar Energy Capacity Net Subscriber Value of $13,445 in Q4, an increase of $2 ...