Miles City DC tie
SPP ↔ Western Interconnection · Back-to-back HVDC converter
A back-to-back converter in eastern Montana joining SPP to the Western Interconnection.
Operator readings
Compare each operator’s reading at its stated time. Scheduled transfers and metered physical flow measure different things.
- As SPP reports it
- 18 MW · SPP → Western Interconnection
Delayed publication · as of Nov 9, 11:55 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: SPP → Western Interconnection. Below: the reverse.
- Usual direction
- SPP → Western Interconnection in 79% of hours
79% out, 21% in, 0% idle across 703 hours
- Average
- 57 MW · SPP → Western Interconnection
- When busy
- 197 MW
95th percentile of hourly flow either way
- Peak SPP → Western Interconnection
- 198 MW
- Peak Western Interconnection → SPP
- 148 MW
- Direction changes
- 39
Hardware
Its terminals, placed from named HIFLD substations or other cited geospatial sources where available.
- Converter
- Miles City, MT
46.4086, -105.7925 · 230 kV
Sources and method
Readings come from SPP 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 SPP. 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.