These rules are adopted pursuant to the authority granted in RCW 43.325.080, which requires the department to adopt rules to define practicability and clarify how local governments will be evaluated in determining whether they have met the goals set forth in RCW 43.19.648(2). These goals require all local governments, to the extent practicable, to satisfy one hundred percent of their fuel usage for operating publicly owned vehicles, vessels and construction equipment from electricity or biofuel, effective June 1, 2018.