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 July 27, 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 schedule

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.

Your Usage Profile

Estimate the base energy-charge portion of APS R-TOU-E

Measured monthly usage by TOU-E period

Enter period kWh from APS interval or usage-history data. The worksheet does not guess a household profile. In summer, the daytime field uses the ordinary off-peak rate; in winter it uses the 10am-3pm weekday super-off-peak rate.

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. Both sources were checked July 27, 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

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 $0.06171 per kWh figure is the published RCP tranche for qualifying applications from September 1, 2025 through August 31, 2026; it may not be the rate assigned to an older system.

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.