Summary: Revises Tariff WN U-6, Schedule I, Washington Low-Income Energy Efficiency Program. This filing increases the annual benefit amount available to qualifying customers on a per-household basis from $5,000 to $15,000, and increases the flexible spending from $1,000 to $4,000 per-household; annually. Also adds a provision to allow for program impact evaluations, and corrects a typographical error. This filing does not impact customer rates.