Arizona has joined Colorado, Nevada and Oregon in exploring membership in an RTO in the Western Interconnection.

Arizona regulators approved a demand management plan that includes incentives for homeowners who install battery storage with their rooftop solar system.

Western drought has caused historically low water levels at hydropower facilities, including Lake Mead behind Hoover Dam and PG&E's major reservoirs.

Governors from nine Western states agreed to create an integrated network of zero-emission vehicle infrastructure to support travel and commerce in the region.

During a meeting of the Western Conference of Public Service Commissioners, regulators shared strategies for dealing with heat waves, cold snaps and wildfires.

Arizona Corporation Commission voted to advance energy rules requiring electric utilities to cut carbon emissions 50% by 2032, 100% by 2070.

Environmental groups reacted with dismay after regulators in Arizona rejected energy rules that would have set carbon emissions targets.

A surge in applications for residential solar systems is straining local building departments, a situation NREL wants to help fix.

Officials from Arizona, Colorado, Michigan, New Jersey and Virginia spoke about their top priorities for 2021 at the Energy Storage Association Policy Forum

A measure in Nevada to enshrine a clean energy mandate is heading for approval, while New Mexican voters approved an overhaul of the PRC.