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About this map
Every electric substation mapped in Texas (6,274), screened for sites of 15 acres or more. The main list is tiers A–D (749 sites); tier E and “does not meet” are available through the filters.
Tiers
- A – Fenced substation footprint ≥ 15 acres.
- B – Substation sits on a ≥ 15 acre parcel owned by a utility / co-op / transmission provider.
- C – On a ≥ 15 acre parcel owned by an energy developer or generator.
- D – Other owner, but the substation fills ≥ 25% of a ≥ 15 acre parcel.
- E – On a ≥ 15 acre parcel whose owner isn’t a utility or energy company (typically a ranch or farm; the substation is likely leased or an easement).
- N – Doesn’t meet the 15-acre tests. X – Nested inside a larger substation polygon (duplicate, excluded).
Data sources
- Substations, lines, status: OpenStreetMap via Geofabrik Texas extract, data as of 2026-11-11 (ODbL).
- Parcels, owners, addresses, market value: Texas Geographic Information Office (TxGIO) StratMap land parcels, 2025 county appraisal rolls.
- Grid region: HIFLD / NERC Regions polygons (validated 2022), with HIFLD control areas and operator names as consistency checks.
- Basemaps: © OpenStreetMap contributors, ; Esri World Imagery.
Important caveats
- OpenStreetMap is volunteer-mapped and incomplete. Some real substations are missing and some are mis-tagged. ERCOT’s and the federal (HIFLD) full lists aren’t public.
- “No mapped lines” is not proof of disconnection. It means OSM shows no power line touching the fence (±25 m). Lines may be unmapped, underground, or the site may be retired or under construction.
- Line counts are OSM ways, not circuits; one circuit can be split into several ways. Voltages and operators are blank wherever OSM lines are untagged.
- Grid region is approximate. The boundary polygons are county-scale and a few years old; sites near an ERCOT/SPP/MISO/WECC boundary are a best guess. Each row carries a confidence note.
- Owner is the taxpayer on the 2025 appraisal roll, which is not necessarily the substation operator. Addresses come from the roll; ~100 are approximate reverse-geocodes and some sites have coordinates only.
- Footprint is the OSM-mapped fenced area; parcel acres are computed from parcel geometry. Where several same-owner parcels touch, their total is shown too.
- This is a screening tool, not a survey or legal record. Verify with the county appraisal district and the utility before relying on any record.