This chapter supplements and neither restricts nor limits any powers which a city, town, public utility district, or irrigation district might otherwise have under any laws of this state, except that no such authority created by RCW
87.03.828 and no city, town, or public utility district member of an authority may condemn for the benefit of the authority any plant, works, dam, facility, right, or property owned by any city, town, irrigation district, public utility district, or electrical company subject to the jurisdiction of the utilities and transportation commission.