WA HB1598

Establishes a community solar program for investor-owned utilities allowing customers to subscribe to solar projects up to 5,000 kilowatts and receive bill credits for generated electricity

Requires at least 50% of each project's capacity be subscribed by residential customers and at least 30% by low-income subscribers or low-income service providers

Directs the Utilities and Transportation Commission to adopt rules within 18 months, including a bill credit valuation methodology that accounts for grid benefits, environmental attributes, and provides additional value for preferred sites, tribal projects, and projects with energy storage

Mandates consumer protections including standardized disclosure forms, prohibition of upfront fees and credit checks for residential subscribers, and no early termination charges for residential customers

Requires community solar project managers and subscription managers to register with the commission and allows net-crediting arrangements where subscription costs and credits appear on the utility bill together