Rockdale, TXLocal --:--Sun now --Daylight today --
Sun on a roof in Rockdale.
The PVWatts model puts a generic roof array in Rockdale at 1,498 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 Rockdale climbs and falls, and the modeled output follows it.
kWh per kW DC, modeled by PVWatts. Best month 148, weakest 93: a ratio of 1.59.
How Rockdale comparesderived from the figures above
Where Rockdale sits.
Rockdale ranks 761st of 1220 Texas places modeled here, at the 38th percentile. Its 1,498 kWh per kW is below the Texas median of 1,515. The strongest months are July, August, June and the weakest are December, February, January; output peaks in July and bottoms out in December. In all, 29.3% of the year arrives in June, July and August, about the same than the 29.3% of the median place.
Closest modeled neighbors
- Milano, 16 km east: 1,487 kWh per kW, 11 less than Rockdale.
- Thorndale, 20 km west: 1,497 kWh per kW, 1 less than Rockdale.
- Cameron, 22 km north: 1,516 kWh per kW, 18 more than Rockdale.
- Buckholts, 26 km northwest: 1,511 kWh per kW, 13 more than Rockdale.
- Lexington, 28 km south: 1,492 kWh per kW, 6 less than Rockdale.
- Thrall, 29 km west: 1,499 kWh per kW, 1 more than Rockdale.
- Caldwell, 33 km southeast: 1,492 kWh per kW, 6 less than Rockdale.
- Rogers, 37 km northwest: 1,517 kWh per kW, 19 more than Rockdale.
- Taylor, 41 km west: 1,503 kWh per kW, 5 more than Rockdale.
Against Austin
The nearest of the six largest modeled places is Austin, 81 km to the southwest, at 1,483 kWh per kW. Rockdale models 15 kWh per kW (1.0%) above it. Rockdale lies 0.36 degrees of latitude north of Austin, 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 1.5 km), so station distance does little to explain the gap, and the weather record does the rest.
The second-nearest large place is Houston, 183 km southeast, where the same model gives 1,422 kWh per kW, so Rockdale runs 76 above that figure. It runs at least 2% lower in March, May, July, December.
Electricity in Milam CountyEIA-861
Electricity prices nearby
EIA lists Oncor Electric Delivery in this county. Where Rockdale is on Oncor Electric Delivery's lines, homes buy energy from a retail electricity provider and the price depends on the plan. Parts of Rockdale 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 1,498 kWh at $229 per kW a year, plain multiplication and not a savings estimate or an offer.
Also listed in the county
- Entergy Texas Inc.: 13.89¢ per kWh, a bundled average, 469,094 residential customers across 27 counties.
- Bluebonnet Electric Coop, Inc: 11.59¢ per kWh, a bundled average, 119,030 residential customers across 14 counties.
- Heart of Texas Electric Coop: 11.89¢ per kWh, a bundled average, 18,476 residential customers across 7 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 Rockdale. 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 Rockdale 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 $231 per kW a year as plain multiplication.
PVWatts v8station 697101
Month by month, per kW.
| Month | kWh per kW |
|---|---|
| January | 102.7 |
| February | 100.0 |
| March | 120.6 |
| April | 138.0 |
| May | 139.9 |
| June | 144.6 |
| July | 147.9 |
| August | 146.9 |
| September | 131.2 |
| October | 125.7 |
| November | 107.8 |
| December | 93.1 |
| Year | 1,498 |
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 30.66, -97.01 (Rockdale, population 5,637). Weather: typical-year data from station 697101, 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.