Sunnyvale, Texas electricity: Oncor wires and 2,935 competitive homes
Sunnyvale sits on Oncor's wires. Below: ZIP by ZIP, who can shop, and what plans cost this month.
Last updated . Written by Power Hopper. Reviewed by Brent Ward, founder, on 2026-10-19. Data as of October 5, 2026 (meters) and October 19, 2026 (plan prices).
In short: ERCOT counts 2,935 active residential meters with a Sunnyvale address, all on Oncor's wires (October 5, 2026). Nearly every Sunnyvale address in our data is on Oncor's wires and can pick a retail provider.
Who delivers electricity in Sunnyvale?
Outages: Oncor at oncor.com/outages.
Oncor delivery charges and area
Can every address in Sunnyvale choose an electricity provider?
No split flag on any ZIP code that holds Sunnyvale's 2,913 competitive homes; most streets here can shop.
Without retail choice unless opted in: 3 other utilities in Dallas County (EIA 2024).
Moving to Sunnyvale
Local numbers for setting up a home in Sunnyvale, each checked on the official source. More contacts, and a printable list, are on Sunnyvale helpful move-in information.
- Water and utility billing: utility billing (start, transfer or stop water service), 972-203-4161.
- Natural gas: Atmos Energy: customer service, 888-286-6700.
- Public schools: Sunnyvale ISD.
- Driver license: Texas DPS Driver License Office: Garland (Dallas Metro Area), 512-424-2600.
You enter your address on the next screen, and we confirm there whether you can choose an electricity provider at that address.
Have a High Light Bill or Electric Bill?
If your electricity bill in Sunnyvale came in higher than you expected, upload or enter it and see whether another plan could lower your electricity costs, or whether staying where you are makes more sense.
Weather and electricity in Sunnyvale
Typical weather near Sunnyvale, from the nearest NOAA station with a complete 1991-2020 record: Lavon Dam, about 17 miles from the city center (station elevation 510 ft). These are normals for that station, not readings at your address. August is the warmest month on average, with a normal daily high of 93°F; January has the coolest average low, 34°F. Average daily highs reach 90°F or more in July to August. No month averages a daily low at or below freezing.
For electricity, the normals point to two seasons that can lift a household's usage: cooling-degree days (a measure of how far each day's mean temperature sits above 65°F) peak in August at 563 for the month, and heating-degree days (below 65°F) peak in January at 653. How much that matters to a bill depends on the home, its insulation, its heating fuel and the household, so use your own usage history, not a regional average, when you compare plans.
| Month | Avg high °F | Avg low °F | Precipitation (in) | Cooling degree-days | Heating degree-days |
|---|---|---|---|---|---|
| Jan | 54 | 34 | 2.6 | 1 | 653 |
| Feb | 58 | 38 | 2.7 | 3 | 474 |
| Mar | 65 | 46 | 3.5 | 19 | 306 |
| Apr | 73 | 53 | 3.7 | 63 | 117 |
| May | 80 | 63 | 4.7 | 217 | 19 |
| Jun | 88 | 70 | 4.1 | 429 | 0 |
| Jul | 92 | 73 | 1.9 | 552 | 0 |
| Aug | 93 | 73 | 2.2 | 563 | 0 |
| Sep | 87 | 66 | 3.1 | 345 | 6 |
| Oct | 77 | 55 | 4.4 | 111 | 87 |
| Nov | 65 | 45 | 3.4 | 15 | 325 |
| Dec | 56 | 36 | 3.5 | 2 | 589 |
Historical weather records for Dallas County
The Texas Railroad Commission's county table lists a record low of -10°F (1899) and a record high of 115°F (1909), and a regional estimate of 30 consecutive hours as a typical longest freezing or frozen-precipitation period for Dallas County. These are historical county extremes, not Sunnyvale's monthly averages and not a forecast; the normals above describe ordinary months.
Reference only: the U.S. Energy Information Administration's 2020 Residential Energy Consumption Survey puts the average Texas household at about 13,440 kWh a year (about 1,120 kWh a month if spread evenly). That is a statewide average for 2020, not Sunnyvale, and not an estimate for your home. EIA source.
Sources: NOAA NCEI U.S. Climate Normals 1991-2020, station USC00415094; Texas Railroad Commission, Historical Weather Data by County (2022).
What is different about electricity in Sunnyvale?
- Sunnyvale counted about 9,008 residents in the Census Bureau's 2025 estimate, against 7,776 in the 2020 base, a change of +15.8%. The largest one-year change was +348 people, from July 2021 to July 2022. July 1 estimates in between: 8,048 (2021), 8,396 (2022), 8,574 (2023), 8,863 (2024). (Census)
- Sunnyvale covers 16.5 square miles of land and 0.3 square miles of water (Census 2025 Gazetteer). That works out to about 545 residents and 156 occupied households per square mile of land, with roughly 3.5 residents for every Sunnyvale household. (Census, Census, Census)
- Oncor delivers to 3,564,530 competitive homes in all; the 2,935 with a Sunnyvale address are 0.08 percent of them, roughly one in 1,214. (ERCOT)
- On October 5, 2026, ERCOT showed 101 home meters switched off (de-energized) in the ZIP codes most Sunnyvale homes use, against 3,005 switched on; that 3.3 percent is mostly vacant houses and apartments between occupants. (ERCOT)
- One ZIP code, 75182, holds almost every Sunnyvale-addressed competitive home (2,913); it also carries 52 Balch Springs addresses and 30 Garland addresses. Taken whole, 75182 has 1.17 competitive meters per Census household: 3,005 meters, 2,573 households. (ERCOT, Census)
- Sunnyvale is 27 of 30 on a Dallas County list of cities and towns ranked by postal-city competitive homes; the next one up is Wilmer, at 3,165. (ERCOT)
- By the Census Bureau's 2025 estimates, Sunnyvale is the number 24 city or town by population among the 31 that reach into Dallas County, one place ahead of Highland Park (8,764 residents). (Census)
- Mailing cities on the 3,005 competitive home meters in 75182, Sunnyvale's main ZIP code: Sunnyvale 2,913, Balch Springs 52, Garland 30. A mailing city is not a city limit, so the service address, not the postal name, settles which utility serves a home. (ERCOT)
- Electric bills over $250 a month: 51.1 percent of households in 75182, Sunnyvale's main ZIP code, per the ACS 2020-2024; the same survey puts median household income there at $170,348 and the renter share at 8.5 percent. (Census)
- Looking at Sunnyvale's six closest towns, the largest competitive market belongs to Mesquite (53,169 homes on its postal city, about 3 miles off); the thinnest per household is Garland, at 0.23. (ERCOT, Census)
Sunnyvale electricity by the numbers
| Measure | Value |
|---|---|
| Population (July 1, 2025 estimate) | 9,008 |
| Population (2020 estimates base) | 7,776 |
| Occupied households (ACS 2020-2024) | 2,573 |
| Active residential meters with a Sunnyvale address | 2,935 |
| Active business meters with a Sunnyvale address | 626 |
| Residential meters per Census household | 1.14 |
| Delivery utilities (homes) | Oncor 2,935 |
| Counties | Dallas |
| ZIP codes touching Sunnyvale | 1 |
| Split ZIP codes (flagged below) | 0 |
How we built these numbers. Download: Sunnyvale ZIP table (CSV).
What do electricity plans cost in Sunnyvale right now?
Same-day medians for Oncor’s area (Oncor: 170 listings), delivery included; not a quote.
| Delivery utility | 500 kWh | 1,000 kWh | 2,000 kWh | Delivery charge |
|---|---|---|---|---|
| Oncor | 14.1¢ | 13.4¢ | 13.2¢ | 6.8673¢/kWh + $4.06/mo (effective October 4, 2026; tariff) |
Sunnyvale ZIP codes: how much of each is on the competitive market?
Not every address in these ZIP codes has retail choice; check your exact address.
| ZIP | Meters per household | ERCOT competitive homes | Census households | With Sunnyvale address | Share of ZIP land in Sunnyvale | Mailing cities | Reading |
|---|---|---|---|---|---|---|---|
| 75182 | 1.17 | 3,005 | 2,573 | 2,913 | 93% | Sunnyvale 97%, Balch Springs 2% | Near-full coverage. |
Split ZIP codes for Sunnyvale: none flagged.
Homes, renters and electric bills in Sunnyvale’s ZIP codes
ZIP 75182 leads Sunnyvale on electric bills over $250 a month, reported by 51.1 percent of its households; 75182 the most homes built since 2020, 9.6 percent (Census ACS 2020-2024).
| ZIP | Bills $250+ | Household income (median) | Built since 2020 | Sunnyvale-addressed homes | Renting | Meters added Oct 7-18 | In 5+ unit buildings | Vacant-to-active switches |
|---|---|---|---|---|---|---|---|---|
| 75182 | 51.1% | $170,348 | 9.6% | 2,913 | 8.5% | 0 | 0.9% | 3 |
ACS 2020-2024 by ZCTA; meters: ERCOT daily files, Oct 7-18, 2026.
Sunnyvale and its neighbors
| Nearby town (2,000+ residents) | Wires utility | Can homes choose? | Postal-city meters per household | Distance | Competitive homes, postal city |
|---|---|---|---|---|---|
| Mesquite | Oncor | Yes, mostly | 1.06 | 3 mi away | 53,169 homes |
| Heath | Oncor | Yes, mostly | 1.23 | 7 mi away | 4,385 homes |
| Balch Springs | Oncor | Yes, mostly | 1.20 | 7 mi away | 9,879 homes |
| Forney | Oncor | Yes, mostly | 1.40 | 7 mi away | 13,726 homes |
| Rowlett | Oncor | Yes, mostly | 1.14 | 8 mi away | 26,540 homes |
| Garland | Oncor | Some; city utility elsewhere | 0.23 | 9 mi away | 18,558 homes |
Business electricity in Sunnyvale
Sunnyvale business meters: 626 (4.7 homes per business meter); large non-residential meters in Sunnyvale’s main ZIP codes: 10 (ERCOT, October 5, 2026).
Larger accounts can go out to bid with retail providers and direct suppliers; we can’t promise savings or bids.
How do I compare electricity plans in Sunnyvale?
ZIP first, then your address; read each plan’s Electricity Facts Label before choosing.
Common questions about electricity in Sunnyvale
Can Sunnyvale residents pick their own electric company?
Most Sunnyvale homes can. ERCOT's October 5, 2026 extract has 2,935 Sunnyvale-addressed homes on Oncor's competitive system, compared with 2,573 households in the Census survey. No Sunnyvale ZIP code carries a split flag, but only an address lookup is certain.
Where do most Sunnyvale electricity customers live?
75182. It holds 2,913 Sunnyvale-addressed competitive homes; counting every address in the ZIP, ERCOT has 3,005 meters for roughly 2,573 households, a 1.17 ratio.
What do Sunnyvale electricity plans cost per kWh?
On October 19, 2026, the median fixed-rate Power to Choose listing on Oncor's wires was 13.4¢ per kWh at 1,000 kWh a month (170 listings); Oncor's delivery charge of 6.8673¢ per kWh plus $4.06 a month is included. A median is not a quote.
I'm moving to Sunnyvale. How do I set up electricity?
Start with the address check: Oncor-delivered Sunnyvale homes choose among the plans offered there and set a start date. Turnover is real in 75182, where 11.2% moved in the past year (ACS); ERCOT logged 3 vacant-to-active meters in 75182 Oct. 7-18, 2026.
How many households in Sunnyvale can shop for electricity?
ERCOT's October 5, 2026 extract lists 2,935 competitive residential meters with a Sunnyvale mailing address and 626 business meters; ACS 2020-2024: 2,573 occupied Sunnyvale households.
Who do I call in Sunnyvale when the power goes out?
Call Oncor (oncor.com/outages), the wires utility for Sunnyvale's 2,935 competitive homes; a retail provider can't fix lines.
Where to next?
Up: Oncor area · Dallas County
Nearest town pages: Mesquite · Heath · Balch Springs · Forney · Rowlett · Garland · Seagoville · Rockwall
Compare plans · Moving · High bill · Texas rates · Areas without retail choice · Methodology
Sources
- ERCOT TDSP ESIID Extract (report 203): full extract as of Oct 5, 2026; daily files Oct 7-18, 2026
- Census ACS 2020-2024 5-year estimates (B25003 households, B01003 population)
- Census Vintage 2025 city and town population estimates
- Census 2020 ZCTA-to-place and ZCTA-to-county relationship files
- EIA-861 (2024) utility service territories by county
- PUCT Power to Choose residential offer export, Oct 19, 2026, 7:59 AM CT
- PUCT: Choosing an Electric Plan
- PUCT broker directory (BR260201)
- Oncor Electric Delivery
- Oncor delivery tariff (effective October 4, 2026)
- Census Bureau 2025 Gazetteer Files, Texas places (land and water area)
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