How many solar farms are in ERCOT?

ERCOT has 237 operating utility-scale solar farms with 34 GW of capacity, according to the EIA's monthly survey of power plants.

What is the largest solar farm in ERCOT?

Hecate Energy Longhorn Solar LLC in Jack County, Texas is the largest, at 650 MW. It came online in 2026.

How many solar farms were built in ERCOT in 2025?

43 solar farms came online in ERCOT in 2025, with 7,819 MW of capacity.

Who is developing solar farms in ERCOT?

Interconnection queues list each project under a project company, not the developer behind it. Cleanview researches the developer of every project and has them on paid plans.

Solar farms in ERCOT

ERCOT has 237 operating solar farms with 34 GW of capacity. 43 came online in 2025.

Operating237

See planned solar farms in ERCOT

Updated monthly. Last updated November 2026.

Under 50 MW50–249 MW250 MW and up

Updated monthly. Last updated November 2026.

ERCOT had 18 solar farms online in 2016 and 237 in 2026

104

119

138

171

214

237

2016’162017’172018’182019’192020’202021’212022’222023’232024’242025’252026’26

Solar farms online at the end of each year. Source: EIA-860M, compiled by Cleanview.

The 10 largest solar farms in ERCOT

Operating, by capacity

#	Solar farm	Location	Year online	Capacity
1	Hecate Energy Longhorn Solar LLC	Jack County, Texas	2026	650 MW
2	Hornet Solar (TX)	Swisher County, Texas	2025	600 MW
3	Hecate Energy Outpost Solar LLC	Webb County, Texas	2025	515 MW
4	Hecate Energy Frye Solar LLC	Swisher County, Texas	2024	500 MW
5	Aktina Solar	Wharton County, Texas	2023	500 MW
6	Parliament Solar	Waller County, Texas	2025	480 MW
7	Mockingbird Solar Center	Lamar County, Texas	2024	471 MW
8	Old 300 Solar Center, LLC	Fort Bend County, Texas	2024	430 MW
9	2W Permian Solar Project Hybrid	Andrews County, Texas	2021	420 MW
10	Ash Creek Solar	Hill County, Texas	2025	409 MW

Solar farms that came online most recently in ERCOT

Newest first

#	Solar farm	Location	Year online	Capacity
1	Rockhound A	Ector County, Texas	2026	245 MW
2	Yaupon Solar Project (Hybrid)	Milam County, Texas	2026	200 MW
3	Kaufman Solar	Kaufman County, Texas	2026	200 MW
4	King Mountain Solar	Upton County, Texas	2026	175 MW
5	Three W Solar	Hill County, Texas	2026	111 MW
6	Rockhound C	Ector County, Texas	2026	61 MW
7	Rockhound D	Ector County, Texas	2026	28 MW
8	Misae Solar IV LLC	Leon County, Texas	2026	209 MW
9	Millers Branch Solar	Haskell County, Texas	2026	380 MW
10	Gaia Hybrid	Navarro County, Texas	2026	153 MW

The developer behind each project is on paid plans. See plans

How Cleanview tracks solar farms

Operating solar farms come from the EIA's monthly survey of power plants. Planned projects come from the grid operators' interconnection queues. We research who is developing each one, since a queue lists a project company, not its owner.

Questions about solar farms in ERCOT

How many solar farms are in ERCOT?: ERCOT has 237 operating utility-scale solar farms with 34 GW of capacity, according to the EIA's monthly survey of power plants.
What is the largest solar farm in ERCOT?: Hecate Energy Longhorn Solar LLC in Jack County, Texas is the largest, at 650 MW. It came online in 2026.
How many solar farms were built in ERCOT in 2025?: 43 solar farms came online in ERCOT in 2025, with 7,819 MW of capacity.
Who is developing solar farms in ERCOT?: Interconnection queues list each project under a project company, not the developer behind it. Cleanview researches the developer of every project and has them on paid plans.