Data Centers and Arizona's Power Grid: The Facts Are More Complicated Than the Headlines
If you follow the news or social media, you have probably heard some version of this argument: Data centers are coming to Arizona, they are going to consume enormous amounts of electricity, and residential customers will be stuck paying for the power plants, transmission lines and substations needed to serve them.
There is just one problem.
That is not how Arizona's regulatory system works.
Earlier this year, I attended the Arizona Corporation Commission's Large Load Users Development Workshop. Representatives from Arizona Public Service (APS), Salt River Project (SRP) and Tucson Electric Power (TEP) all made presentations about how large-load customers — including data centers and advanced manufacturing facilities — connect to Arizona's electric grid.
What I heard was considerably different from many of the sound bites we continue to hear.
A Data Center Doesn't Simply Plug Into the Grid
Connecting a massive new electrical customer isn't like calling the power company and asking for service at a new house.
Utilities must determine whether the grid can safely and reliably handle the requested load, what new infrastructure may be necessary and whether additional generation, transmission lines, substations or other improvements will be required.
APS, TEP, and SRP told the Commission they are receiving more requests from prospective large-load customers than their systems can currently accommodate. Both utilities have developed queue processes to evaluate and narrow those requests. APS has also proposed long-term contracts and upfront financial commitments from large customers to help ensure those customers — rather than residential and small-business ratepayers — bear the costs and risks associated with new infrastructure.
TEP similarly says it conducts detailed system studies before determining whether a proposed data center can be served without harming reliability or affordability for existing customers. If service is possible, contracts can then establish how the customer will pay its own costs and for infrastructure dedicated to serving it.
This is not an overnight process. Large-load projects require extensive engineering, planning, financial commitments and, depending on the project, regulatory approvals before power begins flowing.
And those protections matter.
"Growth Pays for Growth"
The principle repeatedly emphasized by the Arizona Corporation Commission is simple:
Growth pays for growth.
At the April workshop, there was broad agreement among utilities, regulators, consumer advocates and industry representatives that the "cost causer" should bear the costs it creates rather than shifting those costs to existing customers.
Arizona's approach can include special large-load rates, Energy Supply Agreements, minimum-bill requirements, collateral and credit requirements, termination provisions and direct assignment of generation, transmission and distribution costs.
APS, for example, says its approach for extra-large energy users includes minimum bills, collateral requirements and opportunities for customers to make upfront contributions toward new infrastructure through long-term agreements.
TEP's agreement for the initial phase of a proposed Pima County data center provides a real-world example. The ACC says the agreement requires protections including minimum payments, financial security and termination provisions. TEP also confirmed the data center would cover construction costs for necessary line extensions and a new switchyard.
That is an important part of this discussion that is often missing from social media.
The ACC Just Added More Protections
On August 12, the Arizona Corporation Commission unanimously approved another measure aimed specifically at protecting customers from the costs associated with large-load growth.
This time, the focus was Arizona's electric cooperatives.
Arizona Electric Power Cooperative, Duncan Valley Electric Cooperative, Sulphur Springs Valley Electric Cooperative, Mohave Electric Cooperative, Graham County Electric Cooperative and Trico Electric Cooperative jointly sought a standardized process for handling new large-load customers.
These cooperatives are already talking with multiple large-load businesses interested in locating facilities in their service territories.
Under the new framework, large-load service agreements will come before the Commission through a standardized application process.
ACC Utility Division staff must consider at least three important questions:
- Is the agreement in the public interest?
- Are the rates being charged reasonable?
- Does the agreement ensure that other customer classes are not subsidizing the large-load customer's commercial activities?
Commissioner Kevin Thompson made the purpose particularly clear, saying large-load customers will continue to be responsible for costs associated with their commercial service, including new infrastructure and transmission construction.
Chairman Nick Myers described the policy as a way for rural Arizona to capture economic development without having existing utility customers subsidize it.
Why This Matters for Rural Arizona
The latest ACC action is especially important because the data center discussion is no longer limited to Phoenix, Mesa, Chandler or other major metropolitan areas.
Large-load developers are increasingly looking at rural Arizona.
That creates both opportunities and legitimate concerns.
A large industrial project can require tremendous electrical capacity. If a utility builds expensive infrastructure based on a developer's projections and that project is delayed, downsized or abandoned, somebody could potentially be left paying for those investments.
That is exactly why minimum billing requirements, collateral, long-term contracts, termination provisions and upfront financial commitments matter.
Arizona shouldn't blindly approve every large-load project that comes along.
But we also shouldn't reject economic development based on the assumption that residential customers automatically have to pay for all the infrastructure needed to serve it.
Arizona Has Been Working on This for Some Time
The August decision didn't come out of nowhere.
The ACC opened a formal docket on data centers and large-load customers in April 2025. At that time, Commissioner Thompson said the Commission needed to ensure residential and small-business customers were not burdened with infrastructure costs created by these massive new users. The Commission also stated then that Arizona's data center industry had, to date, been paying its fair share of power-generation and infrastructure expansion under existing rate structures and regulatory practices.
The Commission continued that work through the April 2026 workshop.
Now it has established additional protections for electric cooperatives serving rural Arizona.
This isn't a regulatory system ignoring the issue.
It is a regulatory system actively trying to stay ahead of it.
Don't Let a Sound Bite Replace the Facts
I understand why people are concerned about data centers.
They use tremendous amounts of electricity. Some proposed facilities are enormous. Arizona is growing quickly, and residents have every right to ask whether our electrical system can keep up.
Those are legitimate questions.
But there is a difference between asking hard questions and assuming the answers.
When someone tells you that your electric bill is going up because a data center is coming to Arizona, ask another question:
Who is actually paying for the infrastructure required to serve that data center?
The answer may be considerably different from what you have been hearing.
Arizona's regulators have made their policy direction increasingly clear: large-load customers should pay the costs they create.
That doesn't mean Arizona should stop scrutinizing these projects. Quite the opposite. We should continue demanding strong contracts, adequate financial guarantees, careful engineering studies and safeguards against stranded costs.
But the conversation needs to be based on facts.
Data centers and other large-load users should pay their own way. Arizona's Corporation
Commission has been taking steps to make sure they do.
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