ERCOT East DC tie
ERCOT ↔ SPP · Back-to-back HVDC converter
A back-to-back converter at Welsh in northeast Texas, ERCOT's larger link to SPP and the Eastern Interconnection.
Operator readings
Compare each operator’s reading at its stated time. Scheduled transfers and metered physical flow measure different things.
- As ERCOT reports it
- 0 MW · Idle
Current reading · as of Nov 10, 5:40 PM CST
Last 30 days
Hourly readings, signed so that up is power leaving the market. Each series identifies whether it measures flow or a transfer schedule.
Above zero: ERCOT → SPP. Below: the reverse.
- Usual direction
- SPP → ERCOT in 34% of hours
18% out, 34% in, 47% idle across 720 hours
- Average
- 11 MW · SPP → ERCOT
- When busy
- 596 MW
95th percentile of hourly flow either way
- Peak ERCOT → SPP
- 611 MW
- Peak SPP → ERCOT
- 600 MW
- Direction changes
- 39
- Hours near its rating
- 45 of 720
At 95% or more of 600 MW
Hardware
Its terminals, placed from named HIFLD substations or other cited geospatial sources where available.
- Substation
- Monticello, TX
33.0916, -95.0420 · mapped source
- Converter
- Welsh, TX
33.0552, -94.8374 · mapped source
Sources and method
Readings come from ERCOT interface readings. Each value is shown with its operator and source time; direction is normalized from that operator’s sign convention toward or away from ERCOT. A rating describes the equipment; an operator’s posted directional limit, when available, is a separate operating value. The map point identifies a sourced terminal or crossing where available, or a representative connection point; it does not trace the full route.