Incentivizing grid-connected residential battery energy storage systems.

SB 5727 requires large utilities (with over 100,000 customers) in Washington to create incentive programs for homeowners to install grid-connected residential battery storage systems. It mandates that at least 40% of incentives target low- and moderate-income households, with programs including either time-of-use electricity rates or integration into utility-run virtual power plants. The bill specifies that incentives must lower customers' annual energy costs and prohibits data sales beyond program operations. It aims to increase grid resilience during outages while supporting clean energy goals through utility-administered programs.