APS or SRP? What Every Phoenix Home Buyer Should Check Before Making an Offer

Here's a question we ask clients that catches almost everyone off guard: do you know which electric company serves the house you're about to make an offer on?

Most people assume it works like trash pickup, you're in a city, the city has a provider, done. It doesn't work that way here. And the gap between what people assume and how it actually works shows up later as a summer bill nobody budgeted for, or a solar agreement that turns into a three-week scramble before closing.

This is one of those unglamorous things that separates a smooth close from a stressful one. So let's walk through it.

1. You don't choose your electric provider. Your address does.

In practice, nobody in the Valley shops for an electric company. Service territory was drawn around infrastructure substations, lines, decades-old agreements and your provider comes with the property.

How to actually check:

• SRP has an address lookup tool on its website. Type in the address, see what's served there. It'll also tell you whether SRP provides water at that address, which is a separate question.
• APS doesn't have an address lookup. It publishes service area maps as PDFs, including a Phoenix metro map, and its own start-service page tells you to confirm on the map that APS serves your address before you set anything up.
• If the address sits right on a boundary, call the utility. The Arizona Corporation Commission can also determine the provider from a legal description, which is the belt-and-suspenders version.

2. The two utilities aren't just different companies. They're different kinds of institutions.

This is the part we find genuinely interesting, and it explains a lot about why they behave differently.

APS is an investor-owned utility regulated by the Arizona Corporation Commission. Its rates and its rules get approved by the Commission, and the Commissioners are elected statewide. So if you're an APS customer with a complaint about rate structure, there's a regulatory body between you and the company, and you have a vote in who sits on it.

SRP isn't regulated that way. SRP is a political subdivision of the State of Arizona, and by its own description, its price process is not governed by the Corporation Commission its publicly elected board sets electricity prices directly, after a public notification and feedback period.

Now, the detail that surprises people most. SRP board elections are decided by landowners, not customers, and most seats are weighted by acreage. It's largely one acre, one vote own half an acre, you have half a vote; own two acres, you have two. A handful of at-large seats are one-landowner-one-vote regardless of acreage. What that means practically: renting in SRP territory gets you no vote. Being an SRP customer doesn't by itself get you a vote either. And a large landowner carries proportionally more weight than a homeowner on a typical lot.

We're not telling you this to steer you toward either one. We're telling you because "SRP customers elect the board" gets repeated constantly and it isn't accurate, and because knowing how your utility is governed is just useful.

One correction while we're here: SRP isn't unregulated. The Corporation Commission has no say over its rates, but it does retain oversight on things like bond issuance, large generating plants, and high-voltage transmission lines.

3. How each one bills you structurally

We're going to describe plan shapes rather than plan names, on purpose. Both utilities rename, retire, and freeze plans regularly, and some older plans stay open to existing customers with different terms than anything a new customer can get. Shop the structure, not the brand name, and always pull up the current plan list.

Both utilities offer, broadly:

• A flat-rate plan — same price per unit of energy regardless of when you use it. Worth flagging loudly, because the claim that APS forces residential customers onto time-of-use pricing is out of date. A flat-rate option exists, and APS says customers can change plans at any time.
• Time-of-day plans — cheaper most of the day, more expensive during an on-peak window in the late afternoon and evening. Weekends and listed holidays are generally off-peak. The specific hours have changed before and differ between the two utilities and between plans, so check the current window rather than trusting a number you read somewhere.
• Demand-charge plans — see below.
• EV-oriented plans, for households charging a car overnight.
• SRP also offers a prepaid, pay-as-you-go option. APS has no residential equivalent. For some households that's a genuinely useful budgeting tool.

So what's a demand charge? It bills you not for how much power you used over the month, but for your biggest short burst during peak hours measured in intervals of roughly half an hour to an hour, and billed per kilowatt as its own line on your bill. Run the AC, the oven, the dryer, and the pool pump at the same time on a summer weekday evening and you can set a high demand number that follows you through the whole billing period, even if your total usage was modest.

And here's the correction that matters most in this section: you'll read all over the internet that SRP customers pay a demand charge. Not true. A demand charge applies only to some SRP plans. Its flat-rate plan, its prepaid plan, and several of its time-of-day and solar-export plans carry no demand charge at all. Same goes the other direction APS offers a time-of-day plan both with and without a demand charge.

Which means the real answer to "is APS or SRP cheaper?" is: neither, categorically. It depends on which plan you're on and how your household actually uses power. A family that cooks dinner at 6pm every night and a retired couple who run everything at 10am will get very different answers.

4. If the house has solar panels, read this twice

This is where we see deals get wobbly, and it's almost always avoidable with one early question: are the panels owned, leased or financed, or on a power purchase agreement? Those are three different situations.

If the panels are owned outright or any loan on them is being paid off at closing they convey with the house like any other improvement. Simple.

If they're leased or financed, the buyer has to apply to the solar company and be approved to take over the agreement. Arizona's standard solar addendum is built around this: the seller provides the agreement and the lender's contact information early, the buyer applies right away, and approval generally has to be in hand shortly before closing. If approval doesn't come through and notice is given in time, the contract can be cancelled. The Arizona REALTORS® form was revised partly because solar company bankruptcies made these transfers slower and messier, and the form itself warns the process can take significant time. Translation: this is not a last-week-of-escrow item.

Power purchase agreements are the gap. The standard addendum is written around owned and leased or financed systems. A PPA is economically a third thing you're buying the power, not the equipment and it needs its own attention and the provider's own transfer process.

Three more things worth knowing:

Leased panels don't add appraised value. Under Fannie Mae's guidance, the value of leased or PPA panels can't be included in the appraised value of the property, and separately financed panels that remain personal property can't contribute to value either. Owned panels can. If a seller is pricing a home as though a lease is an asset, that's a conversation.

The interconnection agreement doesn't transfer the same way at both utilities. APS's agreement form is written so that it doesn't terminate when the home is sold, with notice to APS after a change in ownership. SRP's form takes the opposite approach it requires the buyer to sign SRP's then-current version. That wording matters, because a buyer may not inherit the seller's older, more favorable terms.

And the small thing that can cost real money: the standard Arizona addendum tells the buyer to put the electric account in their name on the closing date, because otherwise the rate plan can change. On the APS side, homes with older solar installations may carry a buyback rate locked in for a fixed term measured from the date the system was connected to the grid. If you're buying an APS home with existing solar, call APS before you set up service in your name. Ask what plan the home is on, what its buyback arrangement is, and what happens to it when the account changes hands. The window to get that right is narrow and it isn't something anyone will chase you about.

5. Electricity isn't the only utility that varies

Natural gas — Southwest Gas serves most of the Valley, but not all of it. Mesa, again, runs its own gas utility over most of the city. And plenty of Valley homes are all-electric with no gas service at all, which is worth knowing if you cook on gas and care about it.

Water and sewer — this one's genuinely fragmented. Maricopa County's own list of public water systems runs to roughly 190 separate entries: cities and towns, private and mutual water companies, irrigation and water-user districts, and more. Regulation is split too private water companies answer to the Corporation Commission, municipal systems to their city council, and water improvement districts to the county. The practical takeaway is that "who provides the water" is an address-level question, not a city-level one.

Trash and recycling — inside city limits it's usually the city, often billed on a city utility bill. In unincorporated county areas there is no county pickup at all homeowners arrange it privately with a hauler. In some communities it's bundled into something else. Ask who picks up and who bills for it.

6. What we'd actually ask for, every time

Here's our short list. 

1. Twelve months of bills from the seller. One month tells you nothing in a climate like ours. And a note: you generally can't get the prior owner's usage history from the utility yourself. Both utilities give usage data to the account holder, not to a prospective buyer. So this has to come from the seller, which means asking for it early enough to matter.

2. Which provider, confirmed by address. Not by city, not by the listing, not by the neighbor.

3. Which plan the home is currently on, and whether that plan is still open to new customers. If it's a frozen legacy plan, what you can get may not be what the seller has.

4. Solar status in writing — owned, leased, financed, or PPA.

5. Water, gas, and trash providers, and whether anything is bundled into an HOA assessment so you're not double-counting.

6. Deposit requirements, which differ between the two. APS's deposit rules sit in a Commission-approved tariff capped relative to your estimated average bill and returned after a stretch of on-time payments. SRP writes its own policy, holds deposits longer before crediting them, and runs a credit check that a credit freeze can interfere with. If you've got a freeze on your credit, lift it before you set up service or you'll be doing it twice.

We know utility territory is not why you're excited about a house. But this is exactly the kind of thing we think is our job to handle, so you can spend your energy on whether you love the kitchen.