APS bill planning

APS TOU-E Energy-Charge Calculator

Model the base energy portion of APS Time-of-Use 4pm-7pm Weekdays (R-TOU-E). The result is an estimate, not a replica of your final utility bill.

Page reviewed September 4, 2026

Assumptions and exclusions are shown below the result.

Arizona Public Service: Residential Time-of-Use 4pm–7pm Weekdays (R-TOU-E)Arizona Public Service: APS Resource Comparison Proxy export-purchase rate scheduleArizona Public Service: View and download energy usage detailsArizona Public Service: Monthly Plan Comparison: access and usage-history requirementsArizona Public Service: APS customer contact options
Moving or don’t have a bill yet? Start here

An address alone is not enough for this calculator. It uses electricity-use figures you provide. It cannot look up a home’s bills or predict your full monthly payment.

A checklist for planning your budget

  1. Ask what history is available. Ask the owner or property manager whether they can share monthly electricity use and charges for the past year, with personal and account information removed. If they cannot, contact APS and ask what information it can provide for someone considering that address. Availability is not guaranteed.
  2. Look beyond a single average. If you receive history, compare the highest summer month, a cooler month and the annual total. Note the billing dates, plan name, electricity used in kWh, and electricity charges. Ask whether the figures include credits or one-time charges. A payment amount may include an old balance and may not equal that month’s electricity cost.
  3. Check what will change. Ask about solar, a pool, air conditioning, whether the home was occupied, and any equipment changes. Your household’s use and plan may differ from the previous occupant’s, so treat their history as context rather than a promise.

A question you can ask APS

“I’m considering moving to this address. What electricity-use or cost information, if any, can you share? What plan options and starting-service charges should I check before setting a budget?”

This is our suggested question, not a promise that APS will disclose another customer’s records. Use APS’s contact page for current phone and chat options.

When this calculator can help

Use the form below once you have the relevant TOU-E usage split by time of day. If you only have a monthly total, do not guess the peak-hour split and treat the result as a budget. The worked example below is illustrative, not a typical home or address estimate.

For an existing account, APS’s Monthly Plan Comparison compares plans using your past usage. APS says access requires an active rate plan and at least three months of usage history at your current address. This is a separate tool from a pre-move estimate.

APS contact and plan-comparison guidance checked September 4, 2026. The checklist is AZ Energy Hub’s suggested preparation. No bill, address or account upload is needed here; calculator rates retain their separately listed source dates.

APS Time-of-Use 4pm-7pm Weekdays (R-TOU-E)

Summer base energy is $0.34396/kWh on-peak and $0.12345/kWh off-peak. The 10am-3pm super-off-peak tier exists only in winter, at $0.03495/kWh on weekdays.

Electricity you bought from APS

Enter electricity used in each time period. This estimates energy charges, not the full bill.

Where do I find these numbers?

First match your plan: this worksheet is for R-TOU-E, without a demand charge. The similarly named demand plan uses a different calculation.

In your APS account, open Usage. The Download Usage option is below the graph; in the app, open Usage and scroll down. Use kWh for one billing period, not the dollar amount due. kWh measures how much electricity you used; kW measures how quickly you used it.

In summer, put all electricity bought during off-peak hours in Other off-peak and leave Daytime off-peak at zero if you do not have a separate daytime total. Both summer fields use the same rate. In winter, separate super-off-peak kWh from other off-peak kWh. Enter each kWh once.

If you only know total monthly kWh, do not guess the split. You can still use the APS hours and holidays guide to plan flexible tasks.

Account navigation checked September 4, 2026: APS usage instructions. Keep your bill and account number with you; this page does not need an upload.

Usage by time of day (kWh)

Copy the electricity bought from APS in each time period from your usage history. This is called imported energy. Use the same month for all fields. In summer, daytime usage has the ordinary off-peak rate; the cheaper 10am-3pm weekday rate applies only in winter.

kWh/month

Sum import kWh in the tariff peak window for the month being modeled.

kWh/month

Enter remaining off-peak imports outside the separate daytime bucket.

kWh/month

No summer super-off-peak discount applies.

Entered import total: 0 kWh/month

Export credit starts at zero until you enter a verified account-specific rate.

Worked summer example

This illustrative 1,500 kWh month assigns 15% to 4-7pm weekdays and the rest to off-peak buckets. Because TOU-E has no summer super-off-peak tier, both summer off-peak buckets use the same rate.

Base energy charges

$235

Peak usage

225 kWh

Effective base rate

15.65¢/kWh

Rates used

Summer base rates are $0.34396/kWhduring the 4-7pm weekday peak and $0.12345/kWhoff-peak. Winter rates are $0.32543/kWhpeak, $0.12351/kWh off-peak, and $0.03495/kWh from 10am-3pm on winter weekdays.

These figures come from the official APS R-TOU-E tariff. The optional solar credit uses the published APS RCP schedule. The base tariff was checked July 27, 2026; the export schedule was checked September 4, 2026.

What the estimate leaves out

The calculator multiplies estimated usage in each time bucket by the base tariff rate. It does not include APS bill adjustors, basic service charges, taxes, fees, grid-access charges, or account-specific items. Period kWh must come from the month and account you intend to model.

How to use the result

Compare measured period usage or model a specific load shift to see how moving flexible loads outside 4-7pm affects the base energy charge. For rooftop solar, enter only electricity exported to the grid—not total solar production. Confirm your own locked export tranche on an APS statement before relying on the credit estimate.

Frequently asked questions

Can I estimate an APS bill just from an address?

This calculator cannot look up bills by address. It needs TOU-E electricity-use figures split by time of day. If you are moving, ask the property owner what usage history they can share, or ask APS what information is available. Previous occupants’ bills do not guarantee your future costs.

Does APS TOU-E have a summer super-off-peak rate?

No. On the published TOU-E tariff, the 10am-3pm super-off-peak period applies on winter weekdays. Summer daytime usage is billed at the normal off-peak base rate.

Does this estimate equal my final APS bill?

No. It estimates base energy charges and applies an optional user-entered solar export credit. APS service charges, grid-access charges, adjustors, taxes, fees, and other riders are excluded.

What APS solar export rate does the calculator use?

It starts at zero and uses only the rate you enter. The displayed $0.05554 per kWh figure is the published RCP tranche for qualifying applications from September 1, 2026 through August 31, 2027; it may not be the rate assigned to an older system. Confirm your assigned rate on your APS statement.

Where do I get kWh for each time period?

Use APS interval or usage-history data for the month you are modeling. Sum imported kWh in the 4-7pm weekday peak, the separate winter 10am-3pm weekday period when applicable, and all remaining off-peak hours.