Barrio Grid / Texas counties / Rockwall County

Rockwall County, Texas: power grid and siting data

Rockwall County is in ERCOT's NORTH load zone. It has 7 mapped substations, owned mostly by Oncor and Farmers Electric Cooperative; the highest voltage is 345 kV. The ERCOT queue lists 0 generation projects and 1 battery storage project here.

7substations

345 kVhighest voltage

0generation projects queued

1battery projects queued

$39.98NORTH zone, 7-day avg $/MWh

Substations in Rockwall County

2 at 345 kV, 5 at 138 kV.

Substation	Voltage	Owner	Lines
Royse	345 kV	Oncor	17	map
Unnamed station	345 kV	Oncor	0	map
Rockwall	138 kV	Oncor	4	map
Unnamed station	138 kV	Oncor	4	map
Tap302565	138 kV	Oncor	3	map
Unnamed station	138 kV	Farmers Electric Cooperative	3	map
Rockwall East	138 kV	Oncor	0	map

ERCOT interconnection queue

No generation projects are queued in Rockwall County. 1 battery storage project is queued, 0 with a signed interconnection agreement.

From the ERCOT GIS report. Project names, developers, MW and dates are on Pro.

Planned transmission

3 planned grid projects touch Rockwall County: 1 new substation and 2 new or rebuilt lines, 2 at 345 kV or above.

Wholesale power prices

The NORTH load zone averaged $39.98/MWh day-ahead over the last 7 days. Nearest generator pricing nodes: DRAK_ESS_RN $40.34, WIG_BESS_RN $40.34 and OLIN_OLING_1 $40.33.

ERCOT day-ahead settlement point prices. Hourly history, battery spreads and real-time prices are on the map.

Jurisdiction

Nearest city to the county center: Rockwall (0 mi). Outside city limits and ETJ, development falls under county rules and state law. City limits and estimated ETJ are on the map.

Nearby counties

Kaufman County Collin County Dallas County Hunt County Rains County Van Zandt County

See Rockwall County on the map

Every substation, line, queue project, pipeline and price node in Texas, plus Dub, an AI landman who answers questions about any spot. Free account, no card.

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Sources: HIFLD and OpenStreetMap substations and lines, ERCOT GIS report (queue, 2026-09), ERCOT day-ahead prices, TxDOT and StratMap boundaries, Barrio Energy research. Updated 2026-11-09. Screening data only; the serving utility confirms capacity.