Grandfalls, TXLocal --:--Sun now --Daylight today --
Sun on a roof in Grandfalls.
The PVWatts model puts a generic roof array in Grandfalls at 1,763 kWh a year for each kW of panels, using typical-year weather from a station 1.5 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 Grandfalls climbs and falls, and the modeled output follows it.
kWh per kW DC, modeled by PVWatts. Best month 167, weakest 120: a ratio of 1.38.
How Grandfalls comparesderived from the figures above
Where Grandfalls sits.
Grandfalls ranks 30th of 1220 Texas places modeled here, at the 98th percentile. Its 1,763 kWh per kW is above the Texas median of 1,515. The strongest months are April, May, July and the weakest are December, November, January; output peaks in April and bottoms out in December. In all, 27.4% of the year arrives in June, July and August, less than the 29.3% of the median place.
Closest modeled neighbors
- Thorntonville, 28 km north: 1,755 kWh per kW, 8 less than Grandfalls.
- Wickett, 30 km northwest: 1,766 kWh per kW, 3 more than Grandfalls.
- Pyote, 34 km northwest: 1,767 kWh per kW, 4 more than Grandfalls.
- Monahans, 42 km northwest: 1,769 kWh per kW, 6 more than Grandfalls.
- Crane, 48 km east: 1,769 kWh per kW, 6 more than Grandfalls.
- Fort Stockton, 50 km south: 1,763 kWh per kW, 0 the same as Grandfalls.
- Wink, 54 km northwest: 1,793 kWh per kW, 30 more than Grandfalls.
- Barstow, 54 km west: 1,780 kWh per kW, 17 more than Grandfalls.
- Kermit, 61 km north: 1,782 kWh per kW, 19 more than Grandfalls.
Against El Paso
The nearest of the six largest modeled places is El Paso, 344 km to the west, at 1,835 kWh per kW. Grandfalls models 72 kWh per kW (3.9%) below it. Grandfalls lies 0.51 degrees of latitude south of El Paso, which on sun angle alone would point the other way, so clouds, haze and the weather station's record carry the difference. The two weather stations sit a similar distance from their points (1.5 km and 0.9 km), so station distance does little to explain the gap, and the weather record does the rest.
The second-nearest large place is San Antonio, 465 km southeast, where the same model gives 1,505 kWh per kW, so Grandfalls runs 258 above that figure. Against the Texas median place month by month, Grandfalls runs at least 2% higher in January, February, March, April, May, June, July, August, September, October, November, December.
Electricity in Ward CountyEIA-861
Electricity prices nearby
EIA lists Oncor Electric Delivery and Texas-New Mexico Power in this county. Where Grandfalls is on Oncor Electric Delivery and Texas-New Mexico Power's lines, homes buy energy from a retail electricity provider and the price depends on the plan. Parts of Grandfalls 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 1,763 kWh at $270 per kW a year, plain multiplication and not a savings estimate or an offer.
Also listed in the county
- 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 Grandfalls. 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 Grandfalls 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 $272 per kW a year as plain multiplication.
PVWatts v8station 540086
Month by month, per kW.
| Month | kWh per kW |
|---|---|
| January | 127.4 |
| February | 129.6 |
| March | 155.7 |
| April | 166.6 |
| May | 166.2 |
| June | 159.5 |
| July | 163.1 |
| August | 159.8 |
| September | 146.2 |
| October | 142.9 |
| November | 126.1 |
| December | 120.3 |
| Year | 1,763 |
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 31.34, -102.85 (Grandfalls, population 328). Weather: typical-year data from station 540086, 1.5 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.