Arizona knows heat. But in recent years, even long-time residents have felt the difference between a hot summer day and the kind of extreme heat that stretches household budgets, tests local infrastructure and makes reliable electricity a matter of public safety. That is why Arizona utilities are increasingly using flexible technologies like battery energy storage to support rate affordability and to strengthen the electric grid as extreme weather events become more frequent.

Maricopa County has confirmed more than double the number of heat-related deaths so far this year compared to the same point last summer. As of Tuesday, the Maricopa County Office of the Medical Examiner had confirmed 81 heat-related deaths in 2026. At the same point last year, 35 deaths had been confirmed. 587 more deaths from this year remain under investigation as potentially heat-related. That compares to 376 that were still under investigation at this point last year.

The tipping point came in March, when temperatures in Arizona set national records for the month by hitting 112 near Martinez Lake and Fort Yuma. Arizonans know the ritual of the long summer — the thermostat nudged to 82, the vacation skipped, bracing for the electricity bill. What they didn’t budget for was reaching for the AC before spring had even arrived.

Tucson Electric Power says its latest battery project adds 400 megawatts of storage capacity that can feed electricity back to the grid within seconds when usage surges. As extreme summer heat and monsoon storms test the system, some customers are asking whether the added reserve could also make a difference on their monthly bills.

Lawmakers and water officials in Arizona, California and Nevada pushed back against proposed reductions to withdrawal allowances from the drought-stricken Colorado River. The U.S. Bureau of Reclamation’s “adaptive decision framework” included in the recently released final environmental impact statement would reduce the three states’ share by up to 3 million acre-feet a year through 2036, roughly the same amount Nevada and Arizona receive combined.

Tucson Electric Power has opened its largest battery storage facility on the southeast side, and while TEP says it could lower fuel costs on customer bills, some residents are questioning whether the expansion will ultimately cost them more.

My husband and I have gotten used to living in the dark. We abide by a strict “one light at a time rule” in our home to keep our energy bills down. I rely on an oxygen machine to breathe, and my husband needs a CPAP machine and a heart monitor. These devices are critical to our survival and require a lot of power. To balance those needs, we restrict our energy uses elsewhere.

In a state that just set a record high temperature of 117 degrees Fahrenheit, those in charge of overseeing utility rates and energy practices have sent Arizona residents back in time, increasing their reliance on fossil fuels as monthly power bills rise and utility providers benefit.