The Arizona Corporation Commission on Wednesday voted to advance energy rules that would require the state’s electric utilities to cut carbon emissions 50% by 2032 and 100% by 2070. In a 3-2 vote, Commissioners Jim O’Connor (R), Anna Tovar (D) and Sandra Kennedy (D) voted in favor of the rules.

Environmental groups continued to react with dismay this week after regulators in Arizona rejected energy rules that would have required state-regulated electric utilities to reduce carbon emissions by 100% by 2050. The Arizona Corporation Commission rejected the proposed rules by a 3-2 vote on Wednesday after amending them. The amendment...

A surge in applications for residential solar systems is putting a strain on local building departments — a situation that the National Renewable Energy Laboratory wants to help fix. NREL has developed software called Solar Automated Permit Processing, or SolarAPP, which provides automated, instant plan review and permit approval for...