Single SRC Contingency Limits

ISO-NE's published Single SRC Contingency Limits source feed.

Congestion & Constraints data

Download data

Native record

event_time x interface_name

ISO-NE source publication publication cadence

Evidence

Observed market data

Published observations from the named source

Time basis

Point-in-time records

UTC · event_time

Overview

This catalog page exposes the physical schema, coverage, and latest source rows without inventing a normalized grain for publisher-shaped snapshot fields. Use the documented key and event time when comparing revisions or vintages.

Query contract

Preserve one canonical row per (event_time, interface_name) before aggregating.

Analysis rules

Group only after preserving the declared grain: event_time, interface_name.

Schema10

Column

Type

event_timeDateTime64(6, 'UTC')

rt_flow_mwNullable(Float64)

lowest_limit_mwNullable(Float64)

distribution_factorNullable(Float64)

interface_nameLowCardinality(String)

act_margin_mwNullable(Float64)

authorized_margin_mwNullable(Float64)

base_limit_mwNullable(Float64)

single_src_contingency_mwNullable(Float64)

ingested_atDateTime64(6, 'UTC')

Sample data

event_time	rt_flow_mw	lowest_limit_mw	distribution_factor	interface_name	act_margin_mw	authorized_margin_mw	base_limit_mw	single_src_contingency_mw	ingested_at
2026-09-28 12:56:00.000000	449.402	-2000	0.32999998	Seabrook	0	0	0	1240.274	2026-09-28 13:00:12.847151
2026-09-28 12:56:00.000000	449.402	-2000	0.32999998	PJM West	3302.864	600	1400	-2000	2026-09-28 13:00:12.847151
2026-09-28 12:56:00.000000	449.402	-2000	0.32999998	PJM East	4217.62	600	1400	-2000	2026-09-28 13:00:12.847151
2026-09-28 12:56:00.000000	449.402	-2000	0.32999998	PJM Central	3295.137	600	1400	-2000	2026-09-28 13:00:12.847151
2026-09-28 12:56:00.000000	449.402	-2000	0.32999998	PJM 5004/5005	1593.048	600	1400	-2000	2026-09-28 13:00:12.847151
2026-09-28 12:56:00.000000	449.402	-2000	0.32999998	NY Rochester 345KV	10.2	2	1725	-2035	2026-09-28 13:00:12.847151
2026-09-28 12:56:00.000000	449.402	-2000	0.32999998	NY Oakdale 345KV	12.583	1	1855	-2020	2026-09-28 13:00:12.847151
2026-09-28 12:56:00.000000	449.402	-2000	0.32999998	NY Oakdale 230KV	20.748	0	2000	-2000	2026-09-28 13:00:12.847151
2026-09-28 12:56:00.000000	449.402	-2000	0.32999998	NY Central-East	2518.048	9999	0	-7630.448	2026-09-28 13:00:12.847151
2026-09-28 12:56:00.000000	449.402	-2000	0.32999998	Millstone 3	0	0	0	1230.7	2026-09-28 13:00:12.847151
2026-09-28 12:41:00.000000	449.897	-2000	0.32999998	Seabrook	0	0	0	1243.282	2026-09-28 12:45:12.240088
2026-09-28 12:41:00.000000	449.897	-2000	0.32999998	PJM West	3373.457	600	1400	-2000	2026-09-28 12:45:12.240088
2026-09-28 12:41:00.000000	449.897	-2000	0.32999998	PJM East	4298.137	600	1400	-2000	2026-09-28 12:45:12.240088
2026-09-28 12:41:00.000000	449.897	-2000	0.32999998	PJM Central	3361.608	600	1400	-2000	2026-09-28 12:45:12.240088
2026-09-28 12:41:00.000000	449.897	-2000	0.32999998	PJM 5004/5005	1530.856	600	1400	-2000	2026-09-28 12:45:12.240088
2026-09-28 12:41:00.000000	449.897	-2000	0.32999998	NY Rochester 345KV	10.9	2	1725	-2035	2026-09-28 12:45:12.240088
2026-09-28 12:41:00.000000	449.897	-2000	0.32999998	NY Oakdale 345KV	13.644	1	1855	-2020	2026-09-28 12:45:12.240088
2026-09-28 12:41:00.000000	449.897	-2000	0.32999998	NY Oakdale 230KV	21.041	0	2000	-2000	2026-09-28 12:45:12.240088
2026-09-28 12:41:00.000000	449.897	-2000	0.32999998	NY Central-East	2570.201	9999	0	-7788.488	2026-09-28 12:45:12.240088
2026-09-28 12:41:00.000000	449.897	-2000	0.32999998	Millstone 3	0	0	0	1231.8	2026-09-28 12:45:12.240088
2026-09-28 12:26:00.000000	449.897	-2000	0.32999998	Seabrook	0	0	0	1238.769	2026-09-28 12:30:14.617143
2026-09-28 12:26:00.000000	449.897	-2000	0.32999998	PJM West	3128.738	600	1400	-2000	2026-09-28 12:30:14.617143
2026-09-28 12:26:00.000000	449.897	-2000	0.32999998	PJM East	4153.824	600	1400	-2000	2026-09-28 12:30:14.617143
2026-09-28 12:26:00.000000	449.897	-2000	0.32999998	PJM Central	3085.752	600	1400	-2000	2026-09-28 12:30:14.617143
2026-09-28 12:26:00.000000	449.897	-2000	0.32999998	PJM 5004/5005	1550.188	600	1400	-2000	2026-09-28 12:30:14.617143

Coverage

100.0% complete0 gap days1,732 days with data

Show coverage history

Coverage: 100.0%Days with data: 1,732Gaps: 0

2026

2025

2024

2023

2022

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Related congestion & constraints data

Related congestion & constraints data
Dataset	Description
Day-Ahead ConstraintsISONE · daily hourly market results	ISO-NE day-ahead transmission constraints with constraint, contingency, interface flag, and the publisher-signed marginal_value. The source values use the opposite sign from Ask the Grid's canonical shadow price, so analytical ranking should use atg.isone_constraints_da; a non-zero value is cleared day-ahead congestion evidence, not proof of a real-time binding condition.
ISO-NE Day-Ahead Binding ConstraintsISONE · hourly	Which transmission facilities bound in ISO-NE's day-ahead market and what each one cost, one row per interval and constraint. 24,146 rows, 2022-01 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. ISO-NE's negative source marginal values are sign-normalized here so larger positive values have the same meaning as the other markets. 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.
LMP Avg Congestion DAISONE · ISO-NE source publication	ISO-NE's published LMP Avg Congestion DA source feed. This catalog page exposes the physical schema, coverage, and latest source rows without inventing a normalized grain for publisher-shaped snapshot fields. Use the documented key and event time when comparing revisions or vintages.
Total Transfer CapabilityISONE · ISO-NE source publication	ISO-NE's published Total Transfer Capability source feed. This catalog page exposes the physical schema, coverage, and latest source rows without inventing a normalized grain for publisher-shaped snapshot fields. Use the documented key and event time when comparing revisions or vintages.