More changes are needed to the CAISO proposed rules for a Western RTO to win approval from the states in which PacifiCorp operates, stakeholders say.

Critics say CAISO is moving too quickly in its effort to get a plan for a Western RTO to California lawmakers before legislative session's end.

CAISO released a revised set of principles for governing a Western RTO in a bid to convince skeptics that an expanded ISO will be amenable to the entire region.