MISO–SPP seam
MISO ↔ SPP · Market seam (every AC tie between two markets)
Every AC tie between MISO and SPP, down the length of the Plains from the Dakotas to Louisiana.
Operator readings
Compare each operator’s reading at its stated time. Scheduled transfers and metered physical flow measure different things.
- As MISO reports it
- 513 MW · MISO → SPP
Update overdue · as of Nov 9, 10:00 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: MISO → SPP. Below: the reverse.
- Usual direction
- MISO → SPP in 51% of hours
51% out, 48% in, 1% idle across 581 hours
- Average
- 48 MW · MISO → SPP
- When busy
- 1,236 MW
95th percentile of hourly flow either way
- Peak MISO → SPP
- 2,350 MW
- Peak SPP → MISO
- 3,488 MW
- Direction changes
- 79
Sources and method
Readings come from MISO 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 MISO. 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.