Denison, Texas electricity: Oncor wires, 1 split ZIP code to check
Two questions decide electricity in Denison: whose wires reach your street, and what plans on Oncor's system cost right now. This page answers both from ERCOT, Census and PUCT data.
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 14,565 active residential meters with a Denison address, all on Oncor's wires (October 5, 2026). 1 of Denison's ZIP codes is split, so most addresses can shop, but yours needs a check.
Who delivers electricity in Denison?
Outages: Oncor at oncor.com/outages.
Oncor delivery charges and area
Can every address in Denison choose an electricity provider?
2,644 of 14,559 Denison-addressed competitive homes (18%) are in split ZIP codes (75021), where a neighbor may have a different utility.
4 more utilities (co-op, city-owned or non-ERCOT; EIA 2024) also serve parts of Grayson County; no retail choice there unless the utility opted in.
Moving to Denison
Local numbers for setting up a home in Denison, each checked on the official source. More contacts, and a printable list, are on Denison helpful move-in information.
- Water and utility billing: utility billing (start, transfer or stop water service), 903-465-2720.
- Natural gas: Atmos Energy: customer service, 888-286-6700.
- Public schools: Denison ISD, Pottsboro ISD.
- Driver license: Texas DPS Driver License Office: Sherman, 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 Denison 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 Denison
Typical weather near Denison, from the nearest NOAA station with a complete 1991-2020 record: Sherman, about 6 miles from the city center (station elevation 760 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 July at 558 for the month, and heating-degree days (below 65°F) peak in January at 675. 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 | 53 | 34 | 2.5 | 1 | 675 |
| Feb | 57 | 37 | 2.8 | 2 | 502 |
| Mar | 65 | 45 | 4.0 | 17 | 324 |
| Apr | 73 | 53 | 3.9 | 58 | 127 |
| May | 80 | 62 | 5.5 | 203 | 23 |
| Jun | 88 | 70 | 4.5 | 419 | 0 |
| Jul | 93 | 74 | 2.9 | 558 | 0 |
| Aug | 93 | 73 | 2.9 | 553 | 0 |
| Sep | 85 | 66 | 3.4 | 330 | 7 |
| Oct | 75 | 55 | 4.8 | 106 | 100 |
| Nov | 63 | 44 | 3.5 | 12 | 351 |
| Dec | 54 | 36 | 3.6 | 2 | 617 |
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 Denison, and not an estimate for your home. EIA source.
Sources: NOAA NCEI U.S. Climate Normals 1991-2020, station USC00418274.
What is different about electricity in Denison?
- The Census Bureau's July 1, 2025 estimate for Denison is 26,822 people, up 9.6% on the 2020 estimates base of 24,476. The largest one-year change was +1,214 people, from July 2021 to July 2022. (Census)
- The Denison mailing area is bigger than the city: ERCOT lists 14,565 competitive homes under the Denison postal city, 1.4 for each of the city's 10,386 Census households. (ERCOT, Census)
- Of the 3,564,530 homes Oncor serves on the competitive market, 0.4% have a Denison mailing address. (ERCOT)
- From Oct. 7 to Oct. 18, 2026, 37 residential meters in Denison's main ZIP codes went from vacant to active in ERCOT's daily files, which usually means a move-in. (ERCOT)
- De-energized homes, usually empty or between tenants, number 1,548 in Denison's main ZIP codes, 7.2% of all 21,579 residential meters there. (ERCOT)
- ZIP 75020 holds 11,802 of the 14,559 competitive homes with a Denison address (81%); across the whole ZIP there are 1.17 competitive meters per Census household. (ERCOT, Census)
- By competitive homes on its postal city, Denison is number 2 of the 18 cities and towns touching Grayson County, just behind Sherman (22,105). (ERCOT)
- 41.3% of households in 75020 rent (ACS 2020-2024), the most among Denison's main ZIP codes, so a lot of Denison electricity accounts open and close with each lease. (Census)
- Median household income across Denison's main ZIP codes runs from $71,605 in 75020 to $83,067 in 75021 (ACS 2020-2024); 30.7% of 75021 households and 27.6% of 75020 households report $250+ monthly electric bills. (Census)
- Denison's land splits across 2 main ZIP codes, led by 75020 (90%) and 75021 (10%), per the Census 2020 ZCTA-to-place relationship file. (Census)
Denison electricity by the numbers
| Measure | Value |
|---|---|
| Population (July 1, 2025 estimate) | 26,822 |
| Population (2020 estimates base) | 24,476 |
| Occupied households (ACS 2020-2024) | 10,386 |
| Active residential meters with a Denison address | 14,565 |
| Active business meters with a Denison address | 3,177 |
| Residential meters per Census household | 1.4 |
| Delivery utilities (homes) | Oncor 14,565 |
| Counties | Grayson |
| ZIP codes touching Denison | 3 |
| Split ZIP codes (flagged below) | 1 |
How we built these numbers. Download: Denison ZIP table (CSV).
What do electricity plans cost in Denison 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) |
Denison 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 | Denison homes | Land in Denison | Postal cities | Competitive homes (ERCOT) | Households (Census) | Ratio | What it means |
|---|---|---|---|---|---|---|---|
| 75020 | 11,802 | 42% | Denison 100% | 11,806 | 10,085 | 1.17 | Near-full coverage. |
| 75076 | 113 | 0% | Pottsboro 98%, Denison 2% | 5,560 | 3,270 | 1.70 | Near-full coverage. Mostly outside Denison city limits. |
| 75021 | 2,644 | 5% | Denison 99% | 2,665 | 3,379 | 0.79 | Split. Most homes, not all. Mostly outside Denison city limits. |
Split ZIP codes for Denison: 75021.
Homes, renters and electric bills in Denison’s ZIP codes
$250+ monthly electric bills peak in 75076 (42.4% of households); renters in 75020 (41.3%).
| ZIP | Denison homes | Median income | Renters | 5+ units | $250+ bills | Built 2020+ | New meters | Vacant to active |
|---|---|---|---|---|---|---|---|---|
| 75020 | 11,802 | $71,605 | 41.3% | 6.6% | 27.6% | 3.0% | 2 | 22 |
| 75021 | 2,644 | $83,067 | 16.8% | 0.0% | 30.7% | 3.4% | 0 | 6 |
| 75076 | 113 | $76,919 | 18.2% | 3.0% | 42.4% | 2.2% | 2 | 9 |
ACS 2020-2024 by ZCTA; meters: ERCOT daily files, Oct 7-18, 2026.
How do towns near Denison compare?
| Town (2,000+ people) | Miles | Competitive homes | Per household | Utility | Status |
|---|---|---|---|---|---|
| Pottsboro | 5 mi | 5,451 | 5.27 | Oncor | Most addresses can choose |
| Sherman | 10 mi | 22,105 | 1.21 | Oncor | Most addresses can choose |
| Howe | 18 mi | 1,075 | 0.90 | Oncor | Most addresses can choose |
| Whitesboro | 20 mi | 17 | 0.01 | — | City-owned utility; no choice |
| Collinsville | 24 mi | 891 | 1.14 | Oncor | Most addresses can choose |
| Van Alstyne | 24 mi | 1,407 | 0.66 | Oncor | Partly |
Business electricity in Denison
Denison business meters: 3,177 (4.6 homes per business meter); large non-residential meters in Denison’s main ZIP codes: 11 (ERCOT, October 5, 2026).
We compare retail providers and direct suppliers and can bid out high-consumption accounts, but we can’t promise savings or how many suppliers will bid. Businesses in Texas retail-choice areas can request a rate review online.
How do I compare electricity plans in Denison?
ZIP first, then your address; read each plan’s Electricity Facts Label before choosing.
Common questions about electricity in Denison
Can Denison residents pick their own electric company?
Yes, where Oncor's wires reach the house, which in Denison is most of the city: 14,565 homes with a Denison mailing address were on the competitive market on October 5, 2026, 1.4 for each Census household. Split ZIP codes for Denison: 75021; on those, check the exact address.
Which Denison ZIP code has the most homes on the competitive market?
75020, with 11,806 competitive homes in ERCOT's data (11,802 addressed to Denison) against roughly 10,085 Census households, a 1.17 ratio. Coverage is thinnest in 75021, at 0.79.
How many Denison households have a $250 electric bill?
Bills vary across Denison. 42.4% of households in 75076 told the Census survey (ACS 2020-2024) they pay $250 or more a month for electricity, compared with 27.6% in 75020. Bigger, older or all-electric homes push that share up, so compare plans at your own usage.
I'm moving to Denison. How do I set up electricity?
16.9% of 75020 residents moved within a year (ACS), and 22 75020 meters turned from vacant to active Oct. 7-18, 2026. Check that your Denison address is on Oncor's wires, then choose a plan and start date.
Why are there more electric meters than households in Denison?
14,565 Denison-addressed meters against 10,386 city households is 1.4 per household: the Denison postal area extends past city limits, and new homes get meters before the Census counts them. It doesn't mean every nearby address can choose.
Where do I report a Denison power outage?
Oncor, at oncor.com/outages: it carries power to all 14,565 Denison-addressed competitive homes, whatever retail provider bills them.
Where to next?
Up: Oncor area · Grayson County
Nearest town pages: Sherman · Anna · Melissa · Gainesville · Prosper · McKinney · Princeton · Frisco
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)
BJW Ventures LLC d/b/a Power Hopper | PUCT BR260201. PUCT registration is not an endorsement.