Sunrun’s Storage Attachment Rate Tops 50% on California Installations, Powering VPP Growth
Sunrun reported storage attachment rates on new California solar installations climbed above 50% after NEM 3.0 regulatory changes. Aggregated residential batteries exported multiple megawatts during peak demand, fueling virtual power plant expansion and unlocking dual-value streams for homeowners and utilities.
1. Sunrun Strengthens Residential Solar-and-Storage Leadership
Sunrun has significantly broadened its foothold in the residential solar-plus-storage market by increasing its storage attachment rate on new rooftop installations in California to over 50% in Q4 2025. This expansion has been supported by a 30% year-over-year increase in installation capacity, driven by partnerships with seven regional utilities spanning Arizona, Colorado and New York. Analysts have raised full-year EPS estimates by an average of 18% since October, reflecting improved operational leverage and declining equipment costs. At the same time, Sunrun’s return on equity reached 14.2% for the trailing twelve months through December—nearly double the 7.5% average for its solar installation peers—fueling a total shareholder return that has outpaced the broader renewable energy sector by 35% year-to-date.