Wash. Rev. Code § 80.28.050
Every gas company, electrical company, wastewater company, and water company shall file with the commission and shall print and keep open to public inspection schedules in such form as the commission may prescribe, showing all rates and charges made, established or enforced, or to be charged or enforced, all forms of contract or agreement, all rules and regulations relating to rates, charges or service, used or to be used, and all general privileges and facilities granted or allowed by such gas company, electrical company, wastewater company, or water company.
RCW 80.28.050
Findings-Purpose-Limitation of chapter-Effective date- 2011 c 214 : See notes following RCW 80.04.010.
Duty of company to fix rate for wholesale power on request of public utility district: RCW 54.04.100.