Overview
The transmission constraints that bound in PJM's day-ahead market: the monitored facility, the contingency facility, the duration, and the congestion event. It names which elements are expected to limit flows for the next operating day. Note that PJM does not publish a real-time binding-constraint/shadow-price feed, so real-time congestion is read from the congestion component of the LMP tables rather than from a constraints table. Source: PJM Data Miner 2.
Use with MCP
This table is readable two ways, over the same guarded boundary. Over HTTP: POST /api/v1/datasets/pjm_da_transconstraints/query, described in the API reference. Or from an MCP client: connect a market below, then use search_data or describe_data to load its query contract before calling query_data.
Schema6
Column
Type
event_timeDateTime64(6, 'UTC')monitored_facilityLowCardinality(String)contingency_facilityLowCardinality(String)durationNullable(String)day_ahead_congestion_eventNullable(String)ingested_atDateTime64(6, 'UTC')Sample rows
| event_time | monitored_facility | contingency_facility | duration | day_ahead_congestion_event | ingested_at |
|---|---|---|---|---|---|
| 2026-08-28 01:00:00.000000 | NOTTINGH_230KVNOT-PEA_1_LN | L500.Conastone-PeachBottom.5012 | 1 | NOTTINGH_230KVNOT-PEA_1_LN | 2026-08-28 02:18:41.234553 |
| 2026-08-28 01:00:00.000000 | ELIMSPOR_230KVELI-SUN_1_LN | L230.Montour-Saegers.1 | 1 | ELIMSPOR_230KVELI-SUN_1_LN | 2026-08-28 02:18:41.234553 |
| 2026-08-28 01:00:00.000000 | CLIFTYCR_345KVCLI-DEA1_1_LN | ACTUAL | 3 | CLIFTYCR_345KVCLI-DEA1_1_LN | 2026-08-28 02:18:41.234553 |
| 2026-08-28 01:00:00.000000 | NOTTINGH_230KVNOT-PEA_1_LN | L500.Conastone-PeachBottom.5012 | 1 | NOTTINGH_230KVNOT-PEA_1_LN | 2026-08-28 01:18:42.751068 |
| 2026-08-28 01:00:00.000000 | ELIMSPOR_230KVELI-SUN_1_LN | L230.Montour-Saegers.1 | 1 | ELIMSPOR_230KVELI-SUN_1_LN | 2026-08-28 01:18:42.751068 |
| 2026-08-28 01:00:00.000000 | CLIFTYCR_345KVCLI-DEA1_1_LN | ACTUAL | 3 | CLIFTYCR_345KVCLI-DEA1_1_LN | 2026-08-28 01:18:42.751068 |
| 2026-08-28 00:00:00.000000 | PRESTON_69KVPRE-TOD_1_LN | 230/138.Vienna.AT20 | 2 | PRESTON_69KVPRE-TOD_1_LN | 2026-08-28 02:18:41.234553 |
| 2026-08-28 00:00:00.000000 | LENOX-MACNEW_T LEN-MAC A 115 KV | L230.ETowanda-Hillside.2002 [NYISO] | 4 | LENOX-MACNEW_T LEN-MAC A 115 KV | 2026-08-28 02:18:41.234553 |
| 2026-08-28 00:00:00.000000 | INDIANRI_IND13813747_1_LN | L138.IndianRiver.13746Span | 1 | INDIANRI_IND13813747_1_LN | 2026-08-28 02:18:41.234553 |
| 2026-08-28 00:00:00.000000 | HOOVERSV_115KVHOO-TOW_1_LN | ACTUAL | 3 | HOOVERSV_115KVHOO-TOW_1_LN | 2026-08-28 02:18:41.234553 |
| 2026-08-28 00:00:00.000000 | HIGHLAOE_138KVHIG-COM1_1_LN | L345.Wellsville-Sammis | 1 | HIGHLAOE_138KVHIG-COM1_1_LN | 2026-08-28 02:18:41.234553 |
| 2026-08-28 00:00:00.000000 | COOPERPE_230KVCOO-PEA_1_LN | L500.Conastone-PeachBottom.5012 | 1 | COOPERPE_230KVCOO-PEA_1_LN | 2026-08-28 02:18:41.234553 |
| 2026-08-28 00:00:00.000000 | BERGEN_230KVBER-HUD_1_LN | ACTUAL | 4 | BERGEN_230KVBER-HUD_1_LN | 2026-08-28 02:18:41.234553 |
| 2026-08-28 00:00:00.000000 | PRESTON_69KVPRE-TOD_1_LN | 230/138.Vienna.AT20 | 2 | PRESTON_69KVPRE-TOD_1_LN | 2026-08-28 01:18:42.751068 |
| 2026-08-28 00:00:00.000000 | LENOX-MACNEW_T LEN-MAC A 115 KV | L230.ETowanda-Hillside.2002 [NYISO] | 4 | LENOX-MACNEW_T LEN-MAC A 115 KV | 2026-08-28 01:18:42.751068 |
| 2026-08-28 00:00:00.000000 | INDIANRI_IND13813747_1_LN | L138.IndianRiver.13746Span | 1 | INDIANRI_IND13813747_1_LN | 2026-08-28 01:18:42.751068 |
| 2026-08-28 00:00:00.000000 | HOOVERSV_115KVHOO-TOW_1_LN | ACTUAL | 3 | HOOVERSV_115KVHOO-TOW_1_LN | 2026-08-28 01:18:42.751068 |
| 2026-08-28 00:00:00.000000 | HIGHLAOE_138KVHIG-COM1_1_LN | L345.Wellsville-Sammis | 1 | HIGHLAOE_138KVHIG-COM1_1_LN | 2026-08-28 01:18:42.751068 |
| 2026-08-28 00:00:00.000000 | COOPERPE_230KVCOO-PEA_1_LN | L500.Conastone-PeachBottom.5012 | 1 | COOPERPE_230KVCOO-PEA_1_LN | 2026-08-28 01:18:42.751068 |
| 2026-08-28 00:00:00.000000 | BERGEN_230KVBER-HUD_1_LN | ACTUAL | 4 | BERGEN_230KVBER-HUD_1_LN | 2026-08-28 01:18:42.751068 |
| 2026-08-27 23:00:00.000000 | SUSQUEHA_SUS230YARDSPAN_1_LN | ACTUAL | 1 | SUSQUEHA_SUS230YARDSPAN_1_LN | 2026-08-28 02:18:41.234553 |
| 2026-08-27 23:00:00.000000 | MARDELA_69KVMAR-VIE_1_LN | L138.Loretto-Vienna.13780 | 1 | MARDELA_69KVMAR-VIE_1_LN | 2026-08-28 02:18:41.234553 |
| 2026-08-27 23:00:00.000000 | CARL_PN_115KVCAR-GAR_1_LN | 230/115.Lewistown.T3 | 2 | CARL_PN_115KVCAR-GAR_1_LN | 2026-08-28 02:18:41.234553 |
| 2026-08-27 23:00:00.000000 | SUSQUEHA_SUS230YARDSPAN_1_LN | ACTUAL | 1 | SUSQUEHA_SUS230YARDSPAN_1_LN | 2026-08-28 01:18:42.751068 |
| 2026-08-27 23:00:00.000000 | MARDELA_69KVMAR-VIE_1_LN | L138.Loretto-Vienna.13780 | 1 | MARDELA_69KVMAR-VIE_1_LN | 2026-08-28 01:18:42.751068 |
Coverage
85.6% complete875 gap days5,209 days with data
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Coverage: 85.6%Days with data: 5,209Gaps: 875
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