Available & Total Transfer Capability

NYISO available transfer capability and total transfer capability by interface and market run.

Congestion & Constraints data

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Native record

event_time x interface_name x market_run

hourly / 15-minute market-run timesteps publication cadence

Evidence

Observed market data

Published observations from the named source

Time basis

Point-in-time records

UTC · event_time

Overview

The source rows are melted so DAM and HAM timesteps can be compared by interface over time.

Query contract

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

Analysis rules

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

Schema6

Column

Type

event_timeDateTime64(6, 'UTC')

interface_nameLowCardinality(String)

market_runLowCardinality(String)

ttc_mwNullable(Float64)

atc_mwNullable(Float64)

ingested_atDateTime64(6, 'UTC')

Sample data

event_time	interface_name	market_run	ttc_mw	atc_mw	ingested_at
2026-10-02 03:00:00.000000	WEST CENTRAL	DAM	9999	9537	2026-10-01 14:32:53.584530
2026-10-02 03:00:00.000000	UPNY/CONED	DAM	5740	2679	2026-10-01 14:32:53.584530
2026-10-02 03:00:00.000000	SPRAINBROOK/DUNWOODIE SOUTH	DAM	4350	2229	2026-10-01 14:32:53.584530
2026-10-02 03:00:00.000000	SCH-VFT_PJM	DAM	315	315	2026-10-01 14:32:53.584530
2026-10-02 03:00:00.000000	SCH-PJM_VFT	DAM	315	60	2026-10-01 14:32:53.584530
2026-10-02 03:00:00.000000	SCH-PJM_HTP	DAM	660	660	2026-10-01 14:32:53.584530
2026-10-02 03:00:00.000000	SCH-HQ_IMPORT_EXPORT	DAM	1310	1310	2026-10-01 14:32:53.584530
2026-10-02 03:00:00.000000	PJM-NYISO	DAM	1700	227	2026-10-01 14:32:53.584530
2026-10-02 03:00:00.000000	PJM-NEPTUNE	DAM	660	0	2026-10-01 14:32:53.584530
2026-10-02 03:00:00.000000	NYPP EAST	DAM	7550	5392	2026-10-01 14:32:53.584530
2026-10-02 03:00:00.000000	NYISO-PJM	DAM	1050	700	2026-10-01 14:32:53.584530
2026-10-02 03:00:00.000000	NYISO-ISONE	DAM	1600	631	2026-10-01 14:32:53.584530
2026-10-02 03:00:00.000000	NYISO-IMO	DAM	1450	1100	2026-10-01 14:32:53.584530
2026-10-02 03:00:00.000000	NYISO-HQ	DAM	1000	0	2026-10-01 14:32:53.584530
2026-10-02 03:00:00.000000	NPX-CSC	DAM	330	0	2026-10-01 14:32:53.584530
2026-10-02 03:00:00.000000	NPX-1385	DAM	200	200	2026-10-01 14:32:53.584530
2026-10-02 03:00:00.000000	MOSES SOUTH	DAM	3150	3050	2026-10-01 14:32:53.584530
2026-10-02 03:00:00.000000	ISONE-NYISO	DAM	1400	1200	2026-10-01 14:32:53.584530
2026-10-02 03:00:00.000000	IMO-NYISO	DAM	1750	944	2026-10-01 14:32:53.584530
2026-10-02 03:00:00.000000	HQ-NYISO	DAM	1500	1500	2026-10-01 14:32:53.584530
2026-10-02 03:00:00.000000	HQ-CHPE	DAM	1250	1250	2026-10-01 14:32:53.584530
2026-10-02 03:00:00.000000	HQ-CEDARS	DAM	220	220	2026-10-01 14:32:53.584530
2026-10-02 03:00:00.000000	DYSINGER EAST	DAM	2850	2010	2026-10-01 14:32:53.584530
2026-10-02 03:00:00.000000	CSC-NPX	DAM	330	330	2026-10-01 14:32:53.584530
2026-10-02 03:00:00.000000	CENT EAST	DAM	3100	1912	2026-10-01 14:32:53.584530

Coverage

100.0% complete0 gap days9,816 days with data

Show coverage history

Coverage: 100.0%Days with data: 9,816Gaps: 0

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Related congestion & constraints data

Related congestion & constraints data
Dataset	Description
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.
Pre-Scheduled ATC/TTCNYISO · scheduled	NYISO long-term pre-scheduled available transfer capability and total transfer capability by interface. Use it for forward interface-capability context rather than live flows.