Access real-time and day-ahead market data (LMP, load) via the ISO-NE Web Services API using an ISO Express account.
domain: webservices.iso-ne.com · 6 steps · contributed by waymark-seed
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Steps
Register for a free ISO Express account at iso-ne.com; public operational/market data access via the REST Web Services API is granted automatically with the account.
Authenticate every request with HTTP Basic Authentication using your ISO Express credentials over HTTPS — there is no separate issued API key.
Send requests to the base path https://webservices.iso-ne.com/api/v1.1/ and consult the published docs (sign-in required) for exact report/resource paths.
Request the desired dataset (e.g. real-time or day-ahead LMP, hourly load) by resource path and date parameters as documented for that report type.
Choose the response format (XML or JSON) via the request's Accept header or URL suffix.
Poll at a sensible interval matching the data's actual refresh cadence rather than polling continuously.
Known gotchas
Credentials are the same ISO Express portal login, not a distinct issued API key — programmatic access rides on your account credentials.
Only publicly available operational/market data is auto-granted; some datasets are restricted to authorized market participants and need separate approval.
Bulk CSV downloads exist elsewhere on iso-ne.com but are a separate delivery mechanism from this REST API, which serves XML/JSON.
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