Real-Time Limiting Constraints

NYISO real-time limiting-constraint records that identify the limiting facility, facility PTID, contingency, and constraint cost shaping dispatch and price separation.

Congestion & Constraints data NYISO market

Query with the agent

Native record

limiting facility x 5-minute interval after revision collapse

5-minute publication cadence

Evidence

Observed market data

Published observations from the named source

Time basis

Point-in-time records

UTC · event_time

Overview

Use alongside real-time LBMP components to explain congestion rather than just observing price spreads.

Query contract

Use FINAL or argMax over revision time before ranking constraints.

Analysis rules

Group only after preserving the declared grain: event_time, facility_ptid, contingency.

Access

Query from your own tools

Use the guarded HTTP endpoint directly, or connect an MCP client and load the dataset contract with describe_data before calling query_data.

NYISO MCP API reference

HTTP endpoint

POST /api/v1/datasets/nyiso_rt_limiting_constraints/query

Schema7

Column

Type

event_timeDateTime64(6, 'UTC')

time_zoneNullable(String)

limiting_facilityNullable(String)

facility_ptidInt64

contingencyLowCardinality(String)

constraint_costNullable(Float64)

ingested_atDateTime64(6, 'UTC')

Sample data

event_time	time_zone	limiting_facility	facility_ptid	contingency	constraint_cost	ingested_at
2026-10-01 14:55:00.000000	EDT	FALCONER 115 MOONROAD 115 2	26031	MOONROAD-FALCONER_115_175	-96.37	2026-10-01 14:55:08.124090
2026-10-01 14:50:00.000000	EDT	FALCONER 115 MOONROAD 115 2	26031	MOONROAD-FALCONER_115_175	-96.33	2026-10-01 14:55:08.124090
2026-10-01 14:50:00.000000	EDT	FALCONER 115 MOONROAD 115 2	26031	MOONROAD-FALCONER_115_175	-96.33	2026-10-01 14:50:09.326354
2026-10-01 14:45:00.000000	EDT	FALCONER 115 MOONROAD 115 2	26031	MOONROAD-FALCONER_115_175	-96.3	2026-10-01 14:55:08.124090
2026-10-01 14:45:00.000000	EDT	FALCONER 115 MOONROAD 115 2	26031	MOONROAD-FALCONER_115_175	-96.3	2026-10-01 14:50:09.326354
2026-10-01 14:40:00.000000	EDT	FALCONER 115 MOONROAD 115 2	26031	MOONROAD-FALCONER_115_175	-96.41	2026-10-01 14:55:08.124090
2026-10-01 14:40:00.000000	EDT	FALCONER 115 MOONROAD 115 2	26031	MOONROAD-FALCONER_115_175	-96.41	2026-10-01 14:50:09.326354
2026-10-01 14:35:00.000000	EDT	FALCONER 115 MOONROAD 115 2	26031	MOONROAD-FALCONER_115_175	-96.11	2026-10-01 14:55:08.124090
2026-10-01 14:35:00.000000	EDT	FALCONER 115 MOONROAD 115 2	26031	MOONROAD-FALCONER_115_175	-96.11	2026-10-01 14:50:09.326354
2026-10-01 14:30:00.000000	EDT	FALCONER 115 MOONROAD 115 2	26031	MOONROAD-FALCONER_115_175	-96.22	2026-10-01 14:55:08.124090
2026-10-01 14:30:00.000000	EDT	FALCONER 115 MOONROAD 115 2	26031	MOONROAD-FALCONER_115_175	-96.22	2026-10-01 14:50:09.326354
2026-10-01 14:25:00.000000	EDT	FALCONER 115 MOONROAD 115 2	26031	MOONROAD-FALCONER_115_175	-96.41	2026-10-01 14:55:08.124090
2026-10-01 14:25:00.000000	EDT	FALCONER 115 MOONROAD 115 2	26031	MOONROAD-FALCONER_115_175	-96.41	2026-10-01 14:50:09.326354
2026-10-01 14:20:00.000000	EDT	FALCONER 115 MOONROAD 115 2	26031	MOONROAD-FALCONER_115_175	-96.31	2026-10-01 14:55:08.124090
2026-10-01 14:20:00.000000	EDT	FALCONER 115 MOONROAD 115 2	26031	MOONROAD-FALCONER_115_175	-96.31	2026-10-01 14:50:09.326354
2026-10-01 14:15:00.000000	EDT	FALCONER 115 MOONROAD 115 2	26031	MOONROAD-FALCONER_115_175	-97.88	2026-10-01 14:55:08.124090
2026-10-01 14:15:00.000000	EDT	FALCONER 115 MOONROAD 115 2	26031	MOONROAD-FALCONER_115_175	-97.88	2026-10-01 14:50:09.326354
2026-10-01 14:10:00.000000	EDT	FALCONER 115 MOONROAD 115 2	26031	MOONROAD-FALCONER_115_175	-99.95	2026-10-01 14:55:08.124090
2026-10-01 14:10:00.000000	EDT	FALCONER 115 MOONROAD 115 2	26031	MOONROAD-FALCONER_115_175	-99.95	2026-10-01 14:50:09.326354
2026-10-01 14:05:00.000000	EDT	FALCONER 115 MOONROAD 115 2	26031	MOONROAD-FALCONER_115_175	-99.33	2026-10-01 14:55:08.124090
2026-10-01 14:05:00.000000	EDT	FALCONER 115 MOONROAD 115 2	26031	MOONROAD-FALCONER_115_175	-99.33	2026-10-01 14:50:09.326354
2026-10-01 14:00:00.000000	EDT	FALCONER 115 MOONROAD 115 2	26031	MOONROAD-FALCONER_115_175	-99.67	2026-10-01 14:55:08.124090
2026-10-01 14:00:00.000000	EDT	FALCONER 115 MOONROAD 115 2	26031	MOONROAD-FALCONER_115_175	-99.67	2026-10-01 14:50:09.326354
2026-10-01 13:55:00.000000	EDT	FALCONER 115 MOONROAD 115 2	26031	MOONROAD-FALCONER_115_175	-95.5	2026-10-01 14:55:08.124090
2026-10-01 13:55:00.000000	EDT	FALCONER 115 MOONROAD 115 2	26031	MOONROAD-FALCONER_115_175	-95.5	2026-10-01 14:50:09.326354

Coverage

99.7% complete32 gap days9,210 days with data

Show coverage history

Coverage: 99.7%Days with data: 9,210Gaps: 32

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Related congestion & constraints data

Related congestion & constraints data
Dataset	Description
Available & Total Transfer CapabilityNYISO · hourly / 15-minute market-run timesteps	NYISO available transfer capability and total transfer capability by interface and market run. The source rows are melted so DAM and HAM timesteps can be compared by interface over time.
Day-Ahead Limiting ConstraintsNYISO · hourly (DAM)	NYISO day-ahead limiting-constraint records for the market-clearing plan, including limiting facility, facility PTID, contingency, and constraint cost. Paired with day-ahead LBMP components, it helps explain expected congestion and transfer limits before real-time operations.
NYISO Day-Ahead Binding ConstraintsNYISO · hourly	Which transmission facilities bound in NYISO's day-ahead market and what each one cost, one row per interval and constraint. 1.02M rows, 2001-08 to the next delivery day. Columns: event_time, constraint_name, shadow_price_usd_mwh, plus contingency. The shadow price is the marginal cost of the binding limit — what the market would have saved from one more megawatt of capability on that element. This is the table that answers WHY congestion appeared; a price spread between two locations shows that they separated but not which facility separated them.
NYISO Real-Time Binding ConstraintsNYISO · 5-minute	Which transmission facilities bound in NYISO's real-time market and what each one cost, one row per interval and constraint. 5.87M rows, 2001-06 to now. Columns: event_time, constraint_name, shadow_price_usd_mwh, plus contingency. The shadow price is the marginal cost of the binding limit — what the market would have saved from one more megawatt of capability on that element. This is the table that answers WHY congestion appeared; a price spread between two locations shows that they separated but not which facility separated them.