Planned Transmission Upgrades

High Activity — 16 planned upgrade(s) within the site search radius; includes 5 major upgrade(s) at 345 kV+
Criteria: Count of planned transmission upgrades (69 kV+) within 25 mi search radius. Thresholds: 0 = No Planned Activity, ≥1 = Low Activity, ≥2 = High Activity. Higher is better. ISO/RTO jurisdiction: ERCOT.
Source: ERCOT Planned Transmission Upgrades (TPIT) · 2026-07-13
Qualifying Upgrades
16 High Activity
Within 25 mi search radius · ERCOT TPIT July 2026
Major Upgrades (345 kV+)
5 ★ Major
345 kV and above — significant grid capacity additions
Voltage Distribution
9 × 138-229 kV / 5 × 345-499 kV / 2 × 69-137 kV
By voltage class band
ISO/RTO Jurisdiction
ERCOT
Electric Reliability Council of Texas · CenterPoint Energy territory
Existing HV Lines
86 Context
High-voltage lines (≥69 kV) within search radius

Summary

Project Timeline (In-Service Year)

Voltage-Class Composition

Qualifying Planned Upgrades (16)

# Project kV Capacity Status Dist (mi) Method Source
1 Van Vleck substation loop 69 not published Conceptual 4.0 point-only — ERCOT TPIT substation-scoped ERCOT TPIT July 2026
2 Magill: Construct New 138 kV Terminal 138 not published Planned 7.4 point-only — ERCOT TPIT substation-scoped ERCOT TPIT July 2026
3 Chalmers: Construct New Distribution Station 138 not published Planned 10.9 point-only — ERCOT TPIT substation-scoped ERCOT TPIT July 2026
4 Upgrade Sargent - Bay City 69 not published Planned 11.7 point-only — ERCOT TPIT substation-scoped ERCOT TPIT July 2026
5 Zoisite: Construct New 345 kV Station and 345 kV Lines to ST ★ 345 not published Planned ~13.7 (county centroid) point-only — county centroid ERCOT TPIT July 2026
6 Tidehaven: Construct New Distribution Station 138 not published Planned ~13.7 (county centroid) point-only — county centroid ERCOT TPIT July 2026
7 Waterhole 345kV Substation - Gulf Star Storage - Generator I ★ 345 not published Planned 15.8 point-only — ERCOT TPIT substation-scoped ERCOT TPIT July 2026
8 West Columbia to Damon and Needville to Big Creek Ckt.89A Up 138 not published Planned 15.6 point-only — ERCOT TPIT substation-scoped ERCOT TPIT July 2026
9 Rebuild/reconductor Ckt.89A West Columbia to Damon and Ckt.8 138 not published Planned 15.6 point-only — ERCOT TPIT substation-scoped ERCOT TPIT July 2026
10 Rebuild Brazoria - Retrieve 138kV with bundled 795 ACSS 138 not published Planned 16.3 point-only — ERCOT TPIT substation-scoped ERCOT TPIT July 2026
11 Facility Ratings Methodology Phase 2 (FRM2) Upgrades ★ 345 not published Planned 16.4 point-only — ERCOT TPIT substation-scoped ERCOT TPIT July 2026
12 This models the new CEHE Raider Substation and upgrades requ ★ 345 not published Conceptual 16.4 point-only — ERCOT TPIT substation-scoped ERCOT TPIT July 2026
13 South Lane City substation expansion for BRP Diran BESS (23I 138 not published Planned 17.8 point-only — ERCOT TPIT substation-scoped ERCOT TPIT July 2026
14 South Lane City substation expansion for BRP Diran BESS (23I 138 not published Planned 17.8 point-only — ERCOT TPIT substation-scoped ERCOT TPIT July 2026
15 Lane City Pump to Lane City: Rebuild 138 kV Line 138 not published Conceptual 20.0 point-only — ERCOT TPIT substation-scoped ERCOT TPIT July 2026
16 Blessing: Install New 345 kV Cap Bank ★ 345 not published Planned 21.1 point-only — ERCOT TPIT substation-scoped ERCOT TPIT July 2026

Existing Transmission Infrastructure (86 total; nearest 15 shown)

# Line Name Voltage Capacity (MW) Owner Dist (mi)
1 Franklins Camp to CANEY 69 kV 83 AEP Texas 0.9
2 ALLENHURST to CANEY 138 kV 300 AEP TEXAS CENTRAL COMPANY 2.8
3 CANEY to WEEDHAVEN 69 kV n/a AEP Texas 2.9
4 None to Tenaris Substation 138 kV n/a None 3.6
5 VAN VLECK to ALLENHURST 138 kV 300 AEP TEXAS CENTRAL COMPANY 4.0
6 ALLENHURST to ALLENHURST 138 kV n/a None 4.4
7 None to None 138 kV n/a None 6.9
8 Bay City to BLESSING 138 kV 300 AEP TEXAS CENTRAL COMPANY 6.9
9 Bay City to SOUTH LANE CITY 138 kV 300 AEP TEXAS CENTRAL COMPANY 6.9
10 Conoco to Bay City 138 kV 300 AEP TEXAS CENTRAL COMPANY 6.9
11 None to None 345 kV n/a None 7.1
12 OLD OCEAN to OLD OCEAN 2 138 kV 300 TEXAS-NEW MEXICO POWER CO. 7.3
13 Phillips No 5 to NOT AVAILABLE 138 kV 300 TEXAS-NEW MEXICO POWER CO. 7.3
14 None to REFUGE 345 kV n/a None 7.4
15 Phillips No 2 to SWEENY COGENERATION 138 kV 300 TEXAS-NEW MEXICO POWER CO. 7.6

Analysis

ERCOT's Transmission Project Information Tracking (TPIT) shows 16 qualifying planned transmission upgrade(s) within 25 mi of the site. 5 are major upgrades at 345 kV+ (Zoisite: Construct New 345 kV Station an, Waterhole 345kV Substation - Gulf Star S, Facility Ratings Methodology Phase 2 (FR). The site is within ERCOT (CenterPoint Energy service territory) with 86 existing HV transmission lines in the area.

All 16 projects are sourced from ERCOT's Transmission Project Information Tracking (TPIT) system as of July 2026. Per ERCOT methodology, project data is substation-point-only (no line routing geometry is published by ERCOT). Projects are geocoded via substation name matching against the US Substations reference dataset; two projects with no substation match fall back to county centroid geocoding and are marked with approximate distances.

The site benefits from strong transmission planning activity in the Houston-Gulf Coast corridor, with multiple 345 kV projects indicating significant grid capacity expansion. The area is served by CenterPoint Energy and multiple transmission owners including AEP Texas and LCRA TSC.

Next Steps

  • Confirm project timelines with ERCOT for the 5 major (345 kV+) upgrades, especially the Zoisite and Waterhole projects nearest to the site
  • Evaluate interconnection opportunities at upgraded substations once projects reach Under Construction status
  • Monitor ERCOT TPIT quarterly updates for new projects in Brazoria and Matagorda counties
  • Assess impact of planned upgrades on available transfer capability (ATC) at nearby substations

Measurement: WGS 84 / UTM zone 15N (EPSG:32615), utm | Transformation Applied: EPSG:4326→EPSG:32615 (0.0 m)

Sources