Sullivan City, TXLocal --:--Sun now --Daylight today --
Sun on a roof in Sullivan City.
The PVWatts model puts a generic roof array in Sullivan City at 1,588 kWh a year for each kW of panels, using typical-year weather from a station 2.3 km away. A modeled estimate for a standard setup, not a measurement of any roof.
A year on one roof.
Scroll from January to December: the noon sun over Sullivan City climbs and falls, and the modeled output follows it.
kWh per kW DC, modeled by PVWatts. Best month 156, weakest 102: a ratio of 1.52.
How Sullivan City comparesderived from the figures above
Where Sullivan City sits.
Sullivan City ranks 244th of 1220 Texas places modeled here, at the 80th percentile. Its 1,588 kWh per kW is above the Texas median of 1,515. The strongest months are July, August, May and the weakest are December, January, February; output peaks in July and bottoms out in December. In all, 28.7% of the year arrives in June, July and August, less than the 29.3% of the median place.
Closest modeled neighbors
- La Joya, 8 km east: 1,577 kWh per kW, 11 less than Sullivan City.
- La Grulla, 9 km west: 1,579 kWh per kW, 9 less than Sullivan City.
- Penitas, 12 km east: 1,582 kWh per kW, 6 less than Sullivan City.
- Palmview, 19 km east: 1,591 kWh per kW, 3 more than Sullivan City.
- Mission, 25 km east: 1,598 kWh per kW, 10 more than Sullivan City.
- Alton, 25 km east: 1,570 kWh per kW, 18 less than Sullivan City.
- Palmhurst, 26 km east: 1,571 kWh per kW, 17 less than Sullivan City.
- Rio Grande City, 28 km northwest: 1,589 kWh per kW, 1 more than Sullivan City.
- Granjeno, 30 km southeast: 1,561 kWh per kW, 27 less than Sullivan City.
Against San Antonio
The nearest of the six largest modeled places is San Antonio, 354 km to the north, at 1,505 kWh per kW. Sullivan City models 83 kWh per kW (5.5%) above it. Sullivan City lies 3.18 degrees of latitude south of San Antonio, and the sun stands higher in the sky the further south you go, which matches its higher modeled output. The two weather stations sit a similar distance from their points (2.3 km and 2.2 km), so station distance does little to explain the gap, and the weather record does the rest.
The second-nearest large place is Austin, 454 km north, where the same model gives 1,483 kWh per kW, so Sullivan City runs 105 above that figure. Against the Texas median place month by month, Sullivan City runs at least 2% higher in January, February, March, April, May, July, November, December.
Electricity in Hidalgo CountyEIA-861
Electricity prices nearby
EIA lists Oncor Electric Delivery and AEP Texas Central in this county. Where Sullivan City is on Oncor Electric Delivery and AEP Texas Central's lines, homes buy energy from a retail electricity provider and the price depends on the plan. Parts of Sullivan City may instead be served by a co-op or utility listed below, which sets its own rates; check your bill. For scale only, the median 2025 average price across the 60 Texas retail providers on this site is 15.32¢ per kWh, which would put the modeled 1,588 kWh at $243 per kW a year, plain multiplication and not a savings estimate or an offer.
Also listed in the county
- Magic Valley Electric Coop Inc: 10.51¢ per kWh, a bundled average, 129,596 residential customers across 6 counties.
- Oncor Electric Delivery Company LLC: 5.64¢ per kWh, delivery charges only, before the retail energy price, 3,545,814 residential customers across 99 counties.
These utilities serve other parts of the county, which can include parts of Sullivan City. They are the largest bundled providers, and the largest delivery-only one, whose EIA service territory lists the county. A county can list several, and which one serves a street depends on the address, so check your bill.
Modeled estimateruns in your browser
Size the array, see the kWh.
Scale the Sullivan City model to another array size, take off extra losses for shade or dirt, and price the energy at any rate. It is arithmetic on the PVWatts output above, nothing more: not a quote, not a savings estimate and not advice.
Starting rate: the Texas residential average of 15.4¢ per kWh. At that rate the modeled output is worth $245 per kW a year as plain multiplication.
PVWatts v8station 656370
Month by month, per kW.
| Month | kWh per kW |
|---|---|
| January | 105.9 |
| February | 115.6 |
| March | 141.4 |
| April | 139.2 |
| May | 150.1 |
| June | 147.7 |
| July | 155.9 |
| August | 152.2 |
| September | 131.9 |
| October | 127.5 |
| November | 117.7 |
| December | 102.4 |
| Year | 1,588 |
Model assumptions
- System size
- 1 kWDC, results scale per kW
- Mount
- fixed roof mount
- Tilt
- 20°
- Azimuth
- 180°due south
- Modules
- standard
- System losses
- 14%
Location 26.28, -98.56 (Sullivan City, population 3,900). Weather: typical-year data from station 656370, 2.3 km from that point.
Getting a measured number
A model cannot see your roof. Installers measure pitch, shade and the electrical panel on site. Quote marketplaces such as EnergySage, SolarReviews and WattBuy collect bids from local installers. Rate & Roof does not rank installers.
Next step
Payback, buyback.
The sliders above price the energy at one rate. The payback calculator adds the system cost and your buyback plan type, and shows every assumption. It is an estimate, not advice.
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Rates change. Get told.
One list, for Texas solar buyback plans. We write when a tracked rate changes and when new city data is published. Nothing else, and nothing until you confirm.