Sun on a roof in Rio Grande City.

How Rio Grande City comparesderived from the figures above

Where Rio Grande City sits.

Rio Grande City ranks 243rd of 1220 Texas places modeled here, at the 80th percentile. Its 1,589 kWh per kW is above the Texas median of 1,515. The strongest months are July, May, June and the weakest are December, January, November; output peaks in July and bottoms out in December. In all, 28.3% of the year arrives in June, July and August, less than the 29.3% of the median place.

Closest modeled neighbors

• Escobares, 14 km west: 1,627 kWh per kW, 38 more than Rio Grande City.
• Roma, 18 km west: 1,612 kWh per kW, 23 more than Rio Grande City.
• La Grulla, 21 km southeast: 1,579 kWh per kW, 10 less than Rio Grande City.
• Sullivan City, 28 km southeast: 1,588 kWh per kW, 1 less than Rio Grande City.
• La Joya, 36 km east: 1,577 kWh per kW, 12 less than Rio Grande City.
• Penitas, 40 km east: 1,582 kWh per kW, 7 less than Rio Grande City.
• Palmview, 47 km east: 1,591 kWh per kW, 2 more than Rio Grande City.
• Alton, 52 km east: 1,570 kWh per kW, 19 less than Rio Grande City.
• Mission, 53 km east: 1,598 kWh per kW, 9 more than Rio Grande City.

Against San Antonio

The nearest of the six largest modeled places is San Antonio, 344 km to the north, at 1,505 kWh per kW. Rio Grande City models 84 kWh per kW (5.6%) above it. Rio Grande City lies 3.08 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 weather station for Rio Grande City is 1.1 km from the modeled point, against 2.2 km for San Antonio, so part of the gap can come from which station's typical year was used.

The second-nearest large place is Austin, 448 km north, where the same model gives 1,483 kWh per kW, so Rio Grande City runs 106 above that figure. Against the Texas median place month by month, Rio Grande City runs at least 2% higher in January, February, March, May, June, October, November, December. It runs at least 2% lower in April.

Electricity in Starr CountyEIA-861

Electricity prices nearby

EIA lists AEP Texas Central in this county. Where Rio Grande City is on AEP Texas Central's lines, homes buy energy from a retail electricity provider and the price depends on the plan. Parts of Rio Grande 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 1,589 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.
• Medina Electric Coop, Inc: 12.54¢ per kWh, a bundled average, 30,778 residential customers across 17 counties.
• AEP Texas Central Company: 5.91¢ per kWh, delivery charges only, before the retail energy price, 793,896 residential customers across 44 counties.

These utilities serve other parts of the county, which can include parts of Rio Grande 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 Rio Grande 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.