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.

Arizona Public Service would save $110 million/year by joining CAISO's Extended Day-Ahead Market rather than SPP's Markets+, a new analysis found.

A commitment to “growth pays for growth” and properly structuring tariffs and energy supply agreements can ensure data centers pay all their costs, writes Nick Myers of the Arizona Corporation Commission.

Arizona regulators approved a 286-MW energy supply agreement between Tucson Electric Power and the developer of an embattled data center project near Tucson.

The Western Power Pool’s WRAP secured enough participants for the program to enter the first binding phase after 11 utilities reaffirmed their commitment.

The development of SPP's Markets+ has picked up the pace with stakeholders agreeing on an interim governance structure and representation on the working groups that will handle much of the effort ahead.

With data centers contributing to surging load growth, a new report suggests that more Western utilities should adopt clean transition tariffs or even make the tariffs mandatory for certain large customers.

SPP secured $150 million in financing and entered the second phase of development for its day-ahead market Markets+, the grid operator announced.