In a potential hurdle to Blackstone Infrastructure's acquisition of TXNM Energy, state regulators have ordered Blackstone to provide legal justification of its purchase of 8 million shares of TXNM Stock without the regulators' consent.

As Nevada regulators consider NV Energy's request to join CAISO's Extended Day-Ahead Market, the debate over the independence of EDAM's governance is intensifying.

Arizona regulators have repealed the renewable energy standard for electric utilities in the state, saying it's time for renewables to "stand on their own two feet."

Two Arizona utilities received approval to convert coal-fired power plants to run on natural gas, projects they say will enhance grid reliability, reduce emissions and preserve jobs.

As Tucson, Ariz., weighs whether to take over part of Tucson Electric Power's electric system to form a municipal utility, a new study said such a move would cost the city more than $4 billion.