Arizona grid under strain

Arizona regulators and the governor’s energy task force are warning that fast-growing data centers and other giant power users are straining how the state plans and protects its electric grid. (azcc.gov, resilient.az.gov) The Arizona Corporation Commission scheduled a public workshop for April 16, 2026, on “Large Load User Development,” after Commissioner Kevin Thompson opened a docket on the issue in 2025. The commission said the review is focused on rate transparency, new tariffs and shielding residential and small-business customers from cost shifts tied to data centers. (azcc.gov, azcc.gov) The commission said about 1,300 megawatts of data center development is already under construction in Arizona, with more than 4,000 megawatts in planning. In utility terms, a megawatt is a chunk of generating capacity, and thousands of megawatts means new plants, substations and transmission lines have to be lined up years ahead. (azcc.gov, azcc.gov) Arizona Public Service, the state’s largest electric utility, told regulators in 2024 that peak demand could rise from just over 8,000 megawatts to about 13,000 megawatts over roughly 14 years. The utility said data centers, large industrial customers and electric vehicles are driving that climb. (aps.com, azcc.gov) Salt River Project, the other big Phoenix-area power provider, said Maricopa County is on track to become one of the largest data center markets in the United States. SRP said data centers made up 5.1% of its summer 2025 peak-demand record, and some single facilities on its system can require 200 megawatts of capacity. (srpnet.com) The state task force delivered its report to Governor Katie Hobbs on March 1, 2026, and Hobbs’ office released it on April 2. The 36-member group said Arizona needs a policy framework that protects ratepayers from costs caused by large energy users while the state’s electricity demand rises. (resilient.az.gov, resilient.az.gov) The debate is not only about keeping enough power on hand for summer heat. It is also about who pays when utilities must add generation, wires and substations for customers that run around the clock and can be much larger than a traditional factory. (azcc.gov, aps.com) Arizona officials have been careful not to say data centers are currently freeloading. Thompson said in both 2025 and 2026 that the industry has been paying its fair share under existing rules, while arguing that new policies may still be needed before the next wave of projects arrives. (azcc.gov, azcc.gov) The governor’s task force also pushed beyond utility rates. It recommended updating tax and financial incentives for large-load customers and said some members, including the Data Center Coalition, Microsoft and Google, dissented on the proposal to revisit Arizona’s current data center tax break. (rtoinsider.com) That fight is now moving from local zoning battles to state energy policy. Arizona’s next decisions are whether new power-hungry campuses bring their own generation, pay more specialized rates, or keep relying on a grid that utilities say is already being asked to grow much faster than before. (ahwatukee.com, azcc.gov, aps.com)