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ISONE ISO-NE Day-Ahead Constraints

ISO-NE day-ahead transmission constraints with contingency, interface flag and the marginal value exactly as the publisher signs it.

Published by ISO-NE Web Services (opens in a new tab)Cadence: daily hourly market resultsCongestion & ConstraintsISO-NE market
Open in Data (opens in a new tab)

About this data

Each row is a day-ahead constraint and contingency in an ISO-NE delivery interval, with an interface flag and the marginal value as ISO-NE publishes it. ISO-NE's source values carry the opposite sign from the shadow price convention used elsewhere on Ask the Grid, so use the sign-normalized binding constraints dataset for ranking. A non-zero value is cleared day-ahead congestion, not proof of a real-time binding condition.

What people use it for

  • Inspect ISO-NE day-ahead constraints as published
  • Check which constraints carry an interface flag
  • Reconcile with the sign-normalized constraint series

TermsBinding constraintCongestionDay-ahead vs. real-time markets

Where to use it

In Ask the Grid

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ISO-NE market

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Questions

Which data provider has ISONE ISO-NE Day-Ahead Constraints data?
Ask the Grid has it, from ISO-NE Web Services. You can browse every row in Ask the Grid Data or query it with SQL or the Ask the Grid API.
Where does ISONE ISO-NE Day-Ahead Constraints come from?
It comes from ISO-NE Web Services. This page links to the original publication, so any value can be checked against it.
How do I download or query ISONE ISO-NE Day-Ahead Constraints?
Open the iso_ne.constraints_da table in Ask the Grid Data to browse every row and run SQL against it, or call it from code through the Ask the Grid API. Full history can be delivered on a schedule to Snowflake, Databricks or your own storage.