IESO Intertie Limits (real-time)

Real-time import and export limits on IESO's intertie constraints, by IESO's constraint code.

Interchange data IESO market

Query with the agent

Native record

constraint x five-minute interval

five-minute publication cadence

Evidence

Observed market data

Published observations from the named source

Time basis

Point-in-time records

UTC · event_time

Overview

Real-time import and export limits on IESO's intertie constraints, by IESO's constraint code.

Query contract

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

Analysis rules

Rows repeat across polls: dedupe with argMax(value, ingested_at) per key.

Interpretation

event_time marks the END of the interval or hour. IESO delivers on EST all year, but this mirror's event_time was built on Toronto wall time, so between the second Sunday of March and the first Sunday of November it is one hour early. The delivery end is event_time + toIntervalSecond(timeZoneOffset(toTimeZone(event_time, 'America/Toronto')) + 18000); rows in the spring-forward hour cannot be placed. Toronto civil time is for display only.
intertie_name here is IESO's constraint code (e.g. MISIN, NYSIX), not the intertie names in ieso.intertie_flow_5min; do not join them by name. Limits are signed negative as published.

Access

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Schema5

Column

Type

event_timeDateTime64(6, 'UTC')

intertie_nameLowCardinality(String)

import_limit_mwNullable(Float64)

export_limit_mwNullable(Float64)

ingested_atDateTime64(6, 'UTC')

Sample data

event_time	intertie_name	import_limit_mw	export_limit_mw	ingested_at
2026-10-10 16:00:00.000000	PQXYX	∅	0	2026-10-10 17:35:04.170031
2026-10-10 16:00:00.000000	PQXYN	0	∅	2026-10-10 17:35:04.170031
2026-10-10 16:00:00.000000	PQSKX	∅	0	2026-10-10 17:35:04.170031
2026-10-10 16:00:00.000000	PQSKN	0	∅	2026-10-10 17:35:04.170031
2026-10-10 16:00:00.000000	PQQCX	∅	0	2026-10-10 17:35:04.170031
2026-10-10 16:00:00.000000	PQQCN	0	∅	2026-10-10 17:35:04.170031
2026-10-10 16:00:00.000000	PQPCX	∅	-190	2026-10-10 17:35:04.170031
2026-10-10 16:00:00.000000	PQPCN	0	∅	2026-10-10 17:35:04.170031
2026-10-10 16:00:00.000000	PQHZX	∅	0	2026-10-10 17:35:04.170031
2026-10-10 16:00:00.000000	PQHZN	-95	∅	2026-10-10 17:35:04.170031
2026-10-10 16:00:00.000000	PQHAX	∅	0	2026-10-10 17:35:04.170031
2026-10-10 16:00:00.000000	PQHAN	0	∅	2026-10-10 17:35:04.170031
2026-10-10 16:00:00.000000	PQDZX	∅	-70	2026-10-10 17:35:04.170031
2026-10-10 16:00:00.000000	PQDZN	0	∅	2026-10-10 17:35:04.170031
2026-10-10 16:00:00.000000	PQDAX	∅	-240	2026-10-10 17:35:04.170031
2026-10-10 16:00:00.000000	PQDAN	-190	∅	2026-10-10 17:35:04.170031
2026-10-10 16:00:00.000000	PQBEX	∅	-790	2026-10-10 17:35:04.170031
2026-10-10 16:00:00.000000	PQBEN	0	∅	2026-10-10 17:35:04.170031
2026-10-10 16:00:00.000000	PQATX	∅	-1230	2026-10-10 17:35:04.170031
2026-10-10 16:00:00.000000	PQATN	-1230	∅	2026-10-10 17:35:04.170031
2026-10-10 16:00:00.000000	NYSIX	∅	-1100	2026-10-10 17:35:04.170031
2026-10-10 16:00:00.000000	NYSIN	-1400	∅	2026-10-10 17:35:04.170031
2026-10-10 16:00:00.000000	MNSIX	∅	-80	2026-10-10 17:35:04.170031
2026-10-10 16:00:00.000000	MNSIN	0	∅	2026-10-10 17:35:04.170031
2026-10-10 16:00:00.000000	MISIX	∅	-1350	2026-10-10 17:35:04.170031

Coverage

No time-indexed data — coverage isn’t applicable to this dataset.

Related interchange data

Related interchange data
Dataset	Description
IESO Intertie Flows (five-minute)IESO · five-minute, collected hourly	Actual five-minute flow on each of Ontario's interties: Manitoba, Minnesota, Michigan, New York and the Quebec interties.
Actual InterchangeISONE · hourly	ISO-NE actual interchange by published external location, with signed interchange, purchase, and sale components. Preserve location and direction; do not sum a net value with its purchase and sale components.
AESO Interchange (polled)AESO · polled every five minutes	Metered flow on Alberta's interties with British Columbia, Montana and Saskatchewan.
Area Control ErrorPJM · sub-minute (~15-second source; polled every 5 minutes)	PJM area control error in MW at its native fast operating cadence. ACE is the signed instantaneous difference between scheduled and actual balancing obligation; it changes within seconds and should not be treated as a slowly varying reserve or energy quantity. Source: PJM Market Data.