(1) In establishing rates for each gas and electric company regulated by this chapter, the commission shall adopt policies to encourage meeting or reducing energy demand through cogeneration as defined in *RCW 82.35.020, measures which improve the efficiency of energy end use, and new projects which produce or generate energy from renewable resources, such as solar energy, wind energy, hydroelectric energy, geothermal energy, wood, wood waste, municipal wastes, agricultural products and wastes, and end-use waste heat. These policies shall include but are not limited to allowing a return on investment in measures to improve the efficiency of energy end use, cogeneration, or projects which produce or generate energy from renewable resources which return is established by adding an increment of two percent to the rate of return on common equity permitted on the company's other investment. Measures or projects encouraged under this section are those for which construction or installation is begun after June 12, 1980, and before January 1, 1990, and which, at the time they are placed in the rate base, are reasonably expected to save, produce, or generate energy at a total incremental system cost per unit of energy delivered to end use which is less than or equal to the incremental system cost per unit of energy delivered to end use from similarly available conventional energy resources which utilize nuclear energy or fossil fuels and which the gas or electric company could acquire to meet energy demand in the same time period. The rate of return increment shall be allowed for a period not to exceed thirty years after the measure or project is first placed in the rate base.

(2) In establishing rates for water companies regulated by this chapter, the commission may consider the achievement of water conservation goals and the discouragement of wasteful water use practices.

*Reviser's note: RCW 82.35.020 was repealed by 2005 c 443 § 7, effective July 1, 2006.

Purposes—1991 c 347: See note following RCW 90.42.005.

Public utility tax exemptions relating to energy conservation and production from renewable resources: RCW 82.16.055.