Port Isabel, Texas electricity: AEP Texas Central wires, 1 split ZIP code to check
AEP Texas Central wires, 1 split ZIP code and 3,465 competitive homes: the Port Isabel numbers.
Reviewed by Brent Ward, founder, on 2026-10-19. Updated .
Port Isabel at a glance: 3,465 Port Isabel-addressed homes, all wired by AEP Texas Central (ERCOT, Oct. 5, 2026). 1 split ZIP code (78578) holds 3,465 of Port Isabel's 3,465 placed homes (100%); those addresses need a lookup.
Port Isabel wires and choice
AEP Texas Central outages: aeptexas.com/outages. AEP Texas Central
1 split ZIP code (78578) holds 3,465 of Port Isabel's 3,465 placed homes (100%); those addresses need a lookup.
Non-choice utilities listed by EIA (2024) for Cameron: 1.
Moving to Port Isabel
Local numbers for setting up a home in Port Isabel, each checked on the official source. More contacts, and a printable list, are on Port Isabel helpful move-in information.
- Water and utility billing: Laguna Madre Water District: billing or service issues, 956-943-2626.
- Natural gas: Texas Gas Service: customer service, 800-700-2443.
- Public schools: Point Isabel ISD.
- Driver license: Texas DPS Driver License Office: Brownsville, 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 Port Isabel 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 Port Isabel
Typical weather near Port Isabel, from the nearest NOAA station with a complete 1991-2020 record: Port Isabel, about 4 miles from the city center (station elevation 17 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 92°F; January has the coolest average low, 52°F. Average daily highs reach 90°F or more in June 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 606 for the month, and heating-degree days (below 65°F) peak in January at 184. 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 | 69 | 52 | 1.5 | 38 | 184 |
| Feb | 72 | 56 | 1.2 | 78 | 99 |
| Mar | 76 | 61 | 1.7 | 152 | 45 |
| Apr | 81 | 67 | 1.6 | 277 | 10 |
| May | 86 | 73 | 2.4 | 447 | 0 |
| Jun | 90 | 76 | 3.1 | 546 | 0 |
| Jul | 91 | 77 | 2.3 | 589 | 0 |
| Aug | 92 | 77 | 1.9 | 606 | 0 |
| Sep | 89 | 74 | 6.2 | 486 | 0 |
| Oct | 85 | 69 | 3.9 | 378 | 4 |
| Nov | 78 | 61 | 1.8 | 172 | 49 |
| Dec | 71 | 54 | 1.4 | 69 | 160 |
Historical weather records for Cameron County
The Texas Railroad Commission's county table lists a record low of 12°F (1899) and a record high of 108°F (1915), and a regional estimate of 18 consecutive hours as a typical longest freezing or frozen-precipitation period for Cameron County. These are historical county extremes, not Port Isabel'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 Port Isabel, and not an estimate for your home. EIA source.
Sources: NOAA NCEI U.S. Climate Normals 1991-2020, station USC00417179; Texas Railroad Commission, Historical Weather Data by County (2022).
Port Isabel electricity, in numbers and sources
- Land: 18.3 sq mi (water 14.3); 290 residents and 113 households per sq mi; 2.57 people per Port Isabel household. [Gazetteer; PEP; ACS]
- Heating fuel, Port Isabel homes (ACS 2020-2024): electricity 89.4% (±12), utility gas 3.7%, propane 2.0%; Cameron County overall: 89.9% electric. All-electric homes feel winter rates more. [ACS]
- Of Port Isabel homes paying a power bill, 9.0% report $250 or more a month and 27.0% under $100 (Cameron County: 30.9% at $250+); 94.5% of homes pay one at all. [ACS]
- Housing stock: 41.8% detached houses, 17.5% in 5+ unit buildings, 28.6% mobile homes; median year built 1982, 8.6% built 2010 or later. [ACS]
- Port Isabel-addressed home meters on Oct. 5, 2026: 3,465 active, 375 inactive, 398 de-energized, so 18.2% were not in use (ERCOT). [ERCOT]
- ACS 2020-2024: 22.3% of Port Isabel housing units vacant (±6), with 53.2% of vacant units held for seasonal use. Vacant homes keep meters that are not counted as households. [ACS]
- 3,465 home meters use the Port Isabel postal name, against 2,067 households inside city limits (1.68 per household): the mailing area runs well past the boundary. [ERCOT; ACS]
- 78578 carries every one of Port Isabel's placed homes; ratio across the whole ZIP 1.38, from 6,062 home meters in all and 4,379 households. [ERCOT; ACS]
Port Isabel homes: heating fuel, bills, housing
| Port Isabel | Estimate |
|---|---|
| Heat with electricity | 89.4% |
| Heat with utility gas | 3.7% |
| Bill $250 or more | 9.0% |
| Built 2010 or later | 8.6% |
| Renter households | 40.0% |
| Median year built | 1982 |
ACS 2020-2024, the city (Census boundary). Bill rows are shares of homes that pay an electric bill.
Port Isabel meters and households
| Count | Port Isabel |
|---|---|
| Residents, July 2025 | 5,302 |
| Residents, 2020 base | 5,034 |
| Households (ACS) | 2,067 |
| Active home meters | 3,465 |
| Inactive home meters | 375 |
| De-energized home meters | 398 |
| Active small-business meters | 800 |
| Active large-business meters | 3 |
| Home meters per household | 1.68 |
| ZIP codes listed | 1 |
| Split ZIP codes | 1 |
| County | Cameron |
ERCOT report 203, Oct. 5, 2026 (Port Isabel postal city) and Census. CSV · Method
Port Isabel plan prices, October 19, 2026
Median fixed-rate Power to Choose listings. AEP Texas Central (164 listings): 12.7¢ / 12.1¢ / 12¢ per kWh at 500 / 1,000 / 2,000 kWh, delivery 5.6898¢ + $3.24/mo included. Not a quote.
Port Isabel ZIP codes, row by row
Not every address in these ZIP codes has retail choice; check your exact address.
| ZIP code | Port Isabel homes | All ZIP homes | Port Isabel share | ZIP households | Share of Port Isabel land | Meters per household | Flags |
|---|---|---|---|---|---|---|---|
| 78578 | 3,465 | 6,062 | 57% | 4,379 | 100% | 1.38 | split, city utility 32% |
Port Isabel split ZIP codes: 78578.
Towns around Port Isabel
| From Port Isabel | Town (2,000+) | Homes vs Port Isabel | Wires | Per household | Competitive homes |
|---|---|---|---|---|---|
| 3 mi | Laguna Vista | 0.6× | AEP Texas Central | 1.38 | 2,219 |
| 9 mi | South Padre Island | 2.2× | AEP Texas Central | 4.75 | 7,591 |
| 11 mi | Los Fresnos | 1.5× | AEP Texas Central | 2.22 | 5,254 |
| 12 mi | Brownsville | 2.9× | AEP Texas Central | 0.17 | 9,974 |
| 15 mi | Rancho Viejo | 0.4× | AEP Texas Central | 1.34 | 1,467 |
| 20 mi | Rio Hondo | 0.3× | AEP Texas Central | 1.57 | 1,165 |
Port Isabel businesses
803 Port Isabel-addressed business meters; 3 large-class meters across its main ZIP codes (ERCOT). Request a business rate review.
Compare Port Isabel plans
Port Isabel questions
Is electricity deregulated in Port Isabel?
Yes, on AEP Texas Central's wires: 3,465 Port Isabel homes were on the competitive market Oct. 5, 2026 (1.68 per household). Split: 78578. Confirm your address.
Do Port Isabel homes heat with electricity?
89.4% of Port Isabel homes heat with electricity (ACS 2020-2024, margin ±12) and 3.7% with utility gas; 9.0% of bill-paying homes report $250 or more a month. Electric-heat homes should compare plans at winter usage.
What ZIP code do most Port Isabel electricity customers have?
78578: 3,465 Port Isabel-addressed competitive homes; ratio 1.38 across the ZIP (6,062 home meters in all, 4,379 households).
Who do I call when the power is out in Port Isabel?
Outages go to AEP Texas Central (aeptexas.com/outages), the wires utility for 3,465 Port Isabel competitive homes.
How do I set up power at a new Port Isabel home?
Check the address is on AEP Texas Central's wires, choose a plan and a start date. Port Isabel had 773 idle home meters (inactive or de-energized) on Oct. 5, 2026, so many move-ins reconnect an existing meter.
Near Port Isabel
Wires and county: AEP Texas Central · Cameron. Nearby pages: Laguna Vista (3 mi) · Los Fresnos (11 mi) · Rancho Viejo (15 mi) · Rio Hondo (20 mi) · San Benito (21 mi) · South Padre Island (9 mi)
No-choice areas · Methodology · Compare plans
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, tables B25040, B25132, B25024, B25034, B25035, B25018, B19013, B25003, B25002, B25004 (90% margins of error)
- 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)
- AEP Texas (Central Division)
- AEP Texas Central delivery tariff (effective September 29, 2026)
- Census Bureau 2025 Gazetteer Files, Texas places (land and water area)
BJW Ventures LLC d/b/a Power Hopper | PUCT BR260201. PUCT registration is not an endorsement.