Will Arizona data centers raise electric bills? It's a fair question. Data centers use huge amounts of power, and Arizona utilities are getting requests for far more electricity than they have ever served. That growth can require new power plants, power lines and substations, and all of that costs money.
But both of the Phoenix area's big utilities say they're working to make large customers pay for the grid built to serve them. Here's what's known about Arizona data centers and electric bills, what's still undecided, and what you can control at home.
Why Data Centers Are Different
Data centers aren't ordinary commercial buildings. They're packed with servers, networking gear, cooling equipment and backup systems. Many run near full power 24 hours a day, seven days a week. Their electricity use looks nothing like an office building, let alone a house.
How Much Power Are Data Centers Asking For?
Arizona Public Service (APS) says requests from extra-large customers now exceed 19,000 MW (megawatts). That's more than double APS's 2025 peak of 8,648 MW. One megawatt equals 1,000 kilowatts, so these are enormous numbers. Not every request will become a real project. But the scale explains why grid planning has become a big public issue.
How Big Are Data Centers on SRP's System?
Salt River Project (SRP) says data centers made up about 5.1% of its summer 2025 peak demand. They're also its fastest-growing group of customers. Some single SRP data-center sites use around 200 MW. So data centers aren't running the grid today. The concern is how fast they could grow.
Arizona Already Has Huge Summer Demand
Data centers are arriving in a state where heat already pushes the grid hard. APS set a record of 9,053 MW on July 24, 2026. Then it broke that record on August 2, 2026, reaching 9,164 MW between 6 and 7 p.m. SRP also set its own record of 9,072 MW on July 24, 2026. Air conditioning in homes and businesses drives much of that summer peak.
So Arizona faces two growth pressures at once: extreme cooling demand and fast growth from very large users. That's why it matters so much who pays for new grid equipment.
Will APS Customers Pay for New Data Centers?
APS says its goal is to prevent that. On August 19, 2026, APS made a “growth pays for growth” pledge. It says data centers will pay their own costs. It also says it won't connect new extra-large customers faster than it can reliably support them.
That second promise matters. In plain terms, the pace of new hookups is supposed to follow the grid's ability to serve them, not the other way around.
APS Wants Much Higher Rates for Its Largest Customers
APS has a rate case pending before the Arizona Corporation Commission (ACC). In it, APS proposes a big increase for its extra-high-load class. This class covers customers using 5,000 kW or more that run at a very steady, high level almost all the time. Data centers are the main example. APS proposes raising this class's rates by about 47%, which APS describes as “over 45%.”
The idea is that the customers driving new grid costs should cover them. Like everything in the case, this is a proposal. Hearings ended in July 2026, and an ACC decision is expected by the end of 2026.
APS Also Proposes Yearly Formula Rates
The case also includes a proposed Formula Rate Mechanism. APS would adjust rates every year based on the prior 12 months of costs, instead of waiting years between full rate cases. Residential changes would stay between 0.85 and 1.15 times the average change. APS argues yearly reviews would keep costs better matched to the customers who cause them. This is also still a proposal, not an approved rule.
How SRP Handles Very Large Customers
SRP is a not-for-profit public power utility with an elected board, so the ACC doesn't set its prices. In 2025, SRP introduced a program for handling power requests from very large customers like data centers.
SRP also has a price plan, E-67, for new accounts of 20 MW or more. It sets a minimum bill. The customer pays based on the greater of its actual demand or 80% of the demand it forecast. That helps protect against a developer reserving huge amounts of power, triggering grid construction and then using far less.
Does SRP Say Data Centers Are Raising Prices?
No. SRP says large customers, including data centers, pay for the new infrastructure built to serve them. It says data centers are not causing SRP to raise prices. SRP prices can still change for other reasons, such as fuel and grid costs. For example, SRP raised prices starting with November 2025 bills, then cut them temporarily for May–October 2026 bills.
So are data centers raising Arizona electric bills?
They're creating big new grid needs. Both utilities say those costs belong to the large customers who cause them. The real test is how that plays out over time.
So Are Arizona Data Centers Raising Electric Bills?
The most accurate answer today is this: data centers are adding major new grid needs, and both APS and SRP say those costs belong to the large customers. Your bill can still rise for many other reasons. Those include fuel, transmission, aging equipment, reliability upgrades, extreme heat and your own home's usage. It would be misleading to blame every APS or SRP price change on data centers.
Why Homeowners Should Still Pay Attention
Even if data centers pay for their own dedicated equipment, they still change Arizona's long-term power picture. The state may need much more generation, transmission, storage and demand management. Utilities also have to plan further ahead. And whatever the ACC decides in APS's rate case will shape how costs are split for years. So data centers matter even when homeowners are protected from direct cost shifting.
Could Data Centers Ever Help the Grid?
Possibly. Some computing work can be delayed, shifted or briefly reduced. Data centers can also use on-site batteries or their own generation. If that flexibility were used during extreme heat, some data centers could become a grid resource instead of just another load. That's still an emerging idea, not a guarantee.
What Can an Arizona Homeowner Control?
You can't control how many data centers come to Arizona, how utilities plan new power plants or what the ACC decides. But you can control how much electricity your own home needs to buy. In Arizona, that matters a lot.
Step 1: Understand Your Cooling Load
For many Arizona homes, air conditioning is the biggest energy cost. Look at about 12 months of usage history. How much does use jump in summer? Does the AC run almost nonstop? Is one system much older than another? Are some rooms hard to cool? Has usage gone up year over year? A high bill can reflect price, but it can also reflect wasted energy.
Step 2: Reduce Waste
An Arizona home can waste power through aging AC equipment, leaky ducts, thin attic insulation and air leaks. An old pool pump or poor thermostat settings can add more. Imagine cutting yearly use from 24,000 kWh (kilowatt-hours, the unit on your bill) to 19,000 kWh. You'd have 5,000 fewer kWh exposed to future rate changes every year. You can't control APS's rate case. You can control how many kWh you need.
Step 3: Evaluate Solar
Arizona has one of the best solar resources in the country. A well-designed rooftop system can cut how much power you buy from the grid. But its value depends on whether you have APS or SRP, your rate plan and your export credit. That's what the utility pays for extra solar you send to the grid. Value also depends on your roof, when you use power and what the system costs. Design solar around your actual utility and your actual house.
Step 4: Evaluate Battery Storage
A battery can help with outage backup, using more of your own solar and avoiding expensive evening peak hours. But Arizona heat creates a design question. SRP estimates that a central AC unit uses about 3 kW. A battery that runs lights, the fridge and the internet is very different from one that can run central AC. Decide what you need to back up before choosing equipment.
Solar and Batteries Don't Make Data Centers Irrelevant
Installing solar won't slow Arizona's data-center growth. A battery doesn't take you off the grid. The point is different. These tools can reduce how much your household depends on decisions outside your control.
The Ashborn Approach
Before recommending anything, Ashborn Partners looks at your utility, rate plan, usage history, cooling load and insulation. We also review HVAC, solar potential, battery storage and backup needs. We don't need to predict APS or SRP prices ten years out to help you see what you can control today.
You can't control Arizona's electricity demand. You can control your home's energy strategy.
Large-customer rules are still evolving. APS’s pending rate request, including its proposed extra-high-load rate class, has not been approved. Utility rates can change for many reasons unrelated to data centers.