Sun on a roof in Rockwall.

How Rockwall comparesderived from the figures above

Where Rockwall sits.

Rockwall ranks 64th of 157 Texas places modeled here, at the 60th percentile. Its 1,524 kWh per kW is above the Texas median of 1,518. The strongest months are July, August, June and the weakest are February, November, December; output peaks in July and bottoms out in February. In all, 29.9% of the year arrives in June, July and August, more than the 29.4% of the median place.

Closest modeled neighbors

• Fate, 7 km northeast: 1,497 kWh per kW, 27 less than Rockwall.
• Rowlett, 10 km west: 1,517 kWh per kW, 7 less than Rockwall.
• Royse City, 14 km northeast: 1,479 kWh per kW, 45 less than Rockwall.
• Sachse, 14 km northwest: 1,507 kWh per kW, 17 less than Rockwall.
• Wylie, 15 km northwest: 1,534 kWh per kW, 10 more than Rockwall.
• Garland, 18 km west: 1,522 kWh per kW, 2 less than Rockwall.
• Murphy, 19 km northwest: 1,506 kWh per kW, 18 less than Rockwall.
• Forney, 20 km south: 1,514 kWh per kW, 10 less than Rockwall.
• Mesquite, 22 km southwest: 1,488 kWh per kW, 36 less than Rockwall.

Against Dallas

The nearest of the six largest modeled places is Dallas, 34 km to the southwest, at 1,500 kWh per kW. Rockwall models 24 kWh per kW (1.6%) above it. At 0.13 degrees of latitude apart, the two sit at almost the same sun angle, so geometry explains little. The two weather stations sit a similar distance from their points (2.2 km and 2.4 km), so station distance does little to explain the gap, and the weather record does the rest.

The second-nearest large place is Fort Worth, 86 km west, where the same model gives 1,535 kWh per kW, so Rockwall runs 11 below that figure. Against the Texas median place month by month, Rockwall runs at least 2% higher in April, June, October, December. It runs at least 2% lower in February, September, November.

Electricity in Rockwall CountyEIA-861

Electricity prices nearby

EIA lists Oncor Electric Delivery in this county. Where Rockwall is on Oncor Electric Delivery's lines, homes buy energy from a retail electricity provider and the price depends on the plan. Parts of Rockwall 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 1,524 kWh at $233 per kW a year, plain multiplication and not a savings estimate or an offer.

Also listed in the county

• Farmers Electric Coop, Inc: 11.95¢ per kWh, a bundled average, 88,221 residential customers across 12 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 Rockwall. 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 Rockwall 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 15.47¢ per kWh. At that rate the modeled output is worth $236 per kW a year as plain multiplication.