Ask the Grid
Create free workspace
Dashboard
Markets
United States
ERCOT logoERCOT
NYISO logoNYISO
CAISO logoCAISO
All markets
Your work
Saved
Alerts
Reports
Reference
Wire
Stories
Views
Data
Preferences
Create free workspace
Developers
Help
History
Settings
Invites
Website · About · Legal · Privacy · Changelog · © 2026 Parisi Labs
  1. Home
  2. /Assets
  3. /Interties
  4. /Railroad DC tie
ERCOT logo

Railroad DC tie

ERCOT ↔ Mexico (CFE) · Back-to-back HVDC converter

A back-to-back converter near Mission in the Rio Grande Valley, ERCOT's largest link to Mexico.

Now
0 MWIdle
ERCOT · as of Sep 26, 1:22 PM CDT
Between
ERCOT and Mexico (CFE)
Technology
Back-to-back HVDC converter
Published by
ERCOT
Open on the map

What it is carrying

Each operator's own reading, turned into a direction. Where both markets publish the tie, the two should agree.

As ERCOT reports it
0 MW · Idle

as of Sep 26, 1:22 PM CDT

Price across the seamReal-time · CDT
Reading prices…

Last 30 days

Hourly flow, signed so that up is power leaving the market.

As ERCOT reports it-0MW
231107-17Aug 27, 2 PMSep 26, 1 PM

Above zero: ERCOT → Mexico (CFE). Below: the reverse.

Hardware

Its terminals. US terminals are placed on the substation HIFLD's national dataset names for them.

Converter
Sharyland, TX

26.2034, -98.2843 · 138 kV · nearest mapped substation

Related interties

  • ERCOT East DC tie
    ERCOT ↔ SPP
  • ERCOT North DC tie
    ERCOT ↔ SPP
  • Laredo VFT
    ERCOT ↔ Mexico (CFE)
  • Eagle Pass DC tie
    ERCOT ↔ Mexico (CFE)
Usual direction
ERCOT → Mexico (CFE) in 26% of hours

26% out, 0% in, 74% idle across 720 hours

Average
22 MW · ERCOT → Mexico (CFE)
When busy
137 MW

95th percentile of hourly flow either way

Peak ERCOT → Mexico (CFE)
214 MW
Peak Mexico (CFE) → ERCOT
0 MW
Direction changes
0
The average day
0:006:0012:0018:0023:00
Mean flow by the market's local hour. Up: ERCOT → Mexico (CFE). Down: Mexico (CFE) → ERCOT.