Summer Electricity Costs in Surprise — Surprise, Arizona

Surprise is an incorporated city of 149,519 residents in the northwestern quadrant of Maricopa County, situated approximately 25 miles west-northwest of downtown Phoenix in the Sonoran Desert basin at roughly 1,150 to 1,250 feet elevation. According to the U.S. Census Bureau ACS 2023, the city's median age is 41.6 and 79% of its 60,356 housing units are owner-occupied, with a median home value of $396,000. The combination of large single-family detached houses and extreme desert summer temperatures means residential air conditioning loads in Surprise are substantial, and electricity costs during the May through October billing period represent a defining household budget event for a large share of residents.

Every residential customer in Surprise is served by Arizona Public Service (APS), an investor-owned utility regulated by the Arizona Corporation Commission (ACC), a five-member elected body with constitutional authority over Arizona's investor-owned utilities. The city government of Surprise does not set electricity rates; that authority rests with the ACC through a formal rate case process. The most recent completed rate case resulted in new residential tariffs effective March 8, 2024, under ACC Decision No. 79293. A new APS rate case, filed in 2025, was pending ACC review as of July 2026.

Surprise falls entirely within APS's published electric service territory covering Arizona's west Valley. Salt River Project (SRP), the other large Phoenix-area electric utility, describes its territory as central Arizona on SRP's official service area page; as a west Valley city, Surprise lies outside SRP's footprint. This distinction is consequential: SRP operates under a demand-charge pricing model for residential customers, while APS residential plans are structured around energy charges and, for one plan, a separate demand charge component. All Surprise households are therefore subject exclusively to APS rate structures and ACC regulatory oversight.

APS is an investor-owned utility, meaning it cannot independently set its own rates. Any change to the rates paid by Surprise residents requires the ACC to approve a formal rate case filing. The city of Surprise grew from a small community founded in 1938 to nearly 150,000 residents by 2023, and APS extended electrical infrastructure westward across the Valley to serve that growth, as documented in APS service area maps. The result is a single-utility residential market in which the ACC rate case process is the primary mechanism governing what Surprise households pay for electricity.

APS offers Surprise residential customers several rate plan options, all governed by tariffs that took effect March 8, 2024, under ACC Decision No. 79293. The three primary documented plans differ chiefly in how on-peak hours are defined and whether a demand charge applies.

The Time-of-Use 4pm–7pm Weekdays plan (Rate TOU-E) defines on-peak hours as 4 p.m. to 7 p.m., Monday through Friday, year-round. No demand charge applies under this plan. During the winter billing season (November through April), weekday hours from 10 a.m. to 3 p.m. qualify as Super Off-Peak, but no Super Off-Peak period exists during the summer billing season.

The Time-of-Use 4pm–7pm with Demand Charge plan (Rate R-3) shares the same 4–7 p.m. on-peak window on weekdays but adds a per-kilowatt demand charge that varies by season. The Super Off-Peak window of 10 a.m. to 3 p.m. on weekdays applies during the November through April billing cycles under this plan as well, but not during summer.

The Saver Choice Plus plan (Rate R-2) carries a wider on-peak window of 3 p.m. to 8 p.m., Monday through Friday, year-round. This plan was frozen to new enrollees as of December 1, 2021; existing customers enrolled before that date may remain on the plan, but no new Surprise residents may enroll. APS's TOU transition documentation notes that the ACC voted to narrow the residential on-peak window from five hours (3–8 p.m.) to three hours (4–7 p.m.) for new plan options, and that costs previously spread over five on-peak hours were redistributed across the three remaining on-peak hours and off-peak periods. An EV-specific plan is also available, with off-peak overnight charging hours designated as 11 p.m. to 5 a.m. on weekdays, as documented on the APS Compare Service Plans page.

APS defines the summer billing season as the May through October billing cycles, as stated in the Rate TOU-E tariff schedule. During these six months, energy rates are higher than during the November through April winter season, and the Super Off-Peak pricing tier that applies during winter weekday midday hours is entirely absent. The practical consequence for Surprise households is that every kilowatt-hour consumed during summer — including the heavy air conditioning loads required to maintain indoor temperatures in a desert city — is priced at summer rates, with no Super Off-Peak discount available regardless of the hour of day.

Surprise sits in the Sonoran Desert basin, a flat to gently sloping alluvial plain where the National Weather Service Phoenix Forecast Office documents recurring extreme heat from June through September. Maricopa County Excessive Heat Warnings, issued through the National Weather Service, are a recurring seasonal feature of public life in Surprise during this period. The city's predominantly owner-occupied, single-family detached housing stock — with a median home value of $396,000 per the ACS 2023 — means residents occupy larger conditioned spaces than typical multi-family housing, amplifying air conditioning loads and the resulting electricity consumption across the five-month high-rate season. The demographic profile, with a median age of 41.6 and a significant active-adult community presence, also means a substantial share of residents are full-time homeowners who absorb the complete cost of summer cooling rather than tenants whose utilities may be bundled into rent.

The most recent completed APS rate case was filed in 2022 and resulted in ACC-approved residential tariffs effective March 8, 2024, under ACC Decision No. 79293. That rate action introduced the narrowed three-hour on-peak window (4–7 p.m.) for new residential plans, replacing the previous five-hour window (3–8 p.m.) on plans open to new enrollment. The Saver Choice Plus plan (Rate R-2), with its wider 3–8 p.m. on-peak window, was frozen to new enrollees on December 1, 2021, and was not reopened under the 2024 action. Business rate plans were not affected by the on-peak window change and remained at 3–8 p.m., as documented on the APS TOU transition page.

APS filed a new rate case in 2025, which remained pending ACC review as of July 2026. According to APS's publicly posted rate case documentation, the company states that if the request is approved as proposed, the monthly bill for a typical residential customer using 1,000 kilowatt-hours per month would increase by approximately $20. The ACC has not yet issued a decision on the 2025 filing as of the date of this page. The ACC rate case process involves formal public hearings, ACC staff review, and intervener participation before any new rates could take effect; Surprise residents would be subject to whatever rates the ACC ultimately approves or modifies.

The ACS 2023 documents a poverty rate of 7.8% in Surprise, against a total population of 149,519. That rate corresponds to a meaningful number of households for whom the summer billing spike represents a significant financial burden. The federal Low Income Home Energy Assistance Program (LIHEAP), administered in Arizona through the Arizona Department of Economic Security (ADES), provides bill-payment assistance to qualifying low-income households statewide, including in Surprise. The City of Surprise's government also refers residents to energy assistance resources. Specific current LIHEAP eligibility thresholds and local intake locations are administered by ADES; the research brief for this page notes that those operational specifics should be verified directly with ADES or the Surprise city government, as primary-source documentation on current program parameters was not retrieved for this overview.

Beyond the poverty-rate cohort, the broader household budget impact of summer electricity costs extends across income levels given the structural characteristics of Surprise's housing stock. With 79% owner-occupancy in predominantly single-family homes and a median household income of $93,371 per ACS 2023, most Surprise households bear the direct cost of summer air conditioning without any subsidy or utility-bundled arrangement. Maricopa County heat preparedness guidance from county and municipal sources consistently identifies energy costs and utility assistance as components of heat preparedness planning during the Excessive Heat Warning season that recurs each year across the Phoenix metro area.

The two dominant electric utilities in the Phoenix metropolitan area are APS and Salt River Project (SRP), and the boundary between their service territories is a material fact for any city in the region. As documented on SRP's service area page, SRP describes its electric service territory as central Arizona; Surprise, as a west Valley city, falls outside that footprint. Surprise's neighboring municipalities — Peoria to the east, El Mirage and Youngtown to the southeast — are also within APS territory, so the APS rate environment and the ACC regulatory framework govern electricity costs throughout this portion of the west Valley.

SRP is governed by a Board of Directors rather than the ACC and follows a different pricing model that includes residential demand charges. On February 27, 2025, SRP's Board of Directors voted to approve a 2.4% overall rate increase effective November 2025, which AZFamily reported would amount to an average of approximately $5.61 per month for a customer using 1,117 kilowatt-hours per month, per SRP's published documentation of approved residential changes. This context is noted for regional comparison only; that rate structure and that rate action do not apply to Surprise residents. All Surprise customers remain subject exclusively to APS tariffs and ACC decisions, with the pending 2025 APS rate case representing the next potential change to what those customers pay.