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Website · About · Legal · Privacy · Changelog · © 2026 Parisi Labs
  1. Home
  2. /Assets
  3. /Interties
  4. /MISO–SPP seam
MISO logo

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.

Now
189 MWSPP → MISO
MISO · as of Sep 25, 11:00 PM CDT
Between
MISO and SPP
Technology
Market seam (every AC tie between two markets)
Published by
MISO
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 MISO reports it
189 MW · SPP → MISO

as of Sep 25, 11:00 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 MISO reports it-189MW
1,711-1,016-3,742Aug 27, 2 PMSep 25, 11 PM

Above zero: MISO → SPP. Below: the reverse.

Related interties

  • ERCOT East DC tie
    ERCOT ↔ SPP
  • ERCOT North DC tie
    ERCOT ↔ SPP
  • MISO–PJM seam
    MISO ↔ PJM
  • MISO–Manitoba Hydro
    MISO ↔ Manitoba Hydro
  • MISO–Ontario
    MISO ↔ Ontario
Usual direction
SPP → MISO in 74% of hours

25% out, 74% in, 1% idle across 706 hours

Average
319 MW · SPP → MISO
When busy
1,236 MW

95th percentile of hourly flow either way

Peak MISO → SPP
1,335 MW
Peak SPP → MISO
3,366 MW
Direction changes
83
The average day
0:006:0012:0018:0023:00
Mean flow by the market's local hour. Up: MISO → SPP. Down: SPP → MISO.