IESO Registration System Facilities API

A REST API on the Appian-based Online IESO platform for retrieving and maintaining facility registration data. SPEC-249 documents the base path https://online.ieso.ca/suite/webapi/ and the facilities resource at https://online.ieso.ca/suite/webapi/reg-v1-facilities/, with a sandbox at https://onlinesandbox.ieso.ca/suite/webapi/. Authentication is by Appian API key, supplied three ways — HTTP Basic with the key as username-and-blank-password (or the reverse), an Appian-API-Key header, or an Authorization Bearer header — over mandatory HTTPS; a missing or invalid Authorization header returns 401. There is no self-serve key issuance: the organization's registered IESO Rights Administrator must request an API machine account with "Registration API" access, so this is a market-participant-only surface.

Work with this as data

Every API here is available over the APIs.io API and to AI agents over MCP.

MCP server

One button, every client — Claude, Cursor, VS Code and the rest.

https://apis.io/mcp

Tools for apis

7 MCP tools reach this
  • find_apisBrowse and filter every API in the catalog.
  • get_api_artifactsOne API's artifacts, grouped by type.
  • get_openapiThe primary OpenAPI for this API.
  • find_similar_apisAPIs that look like this one.
  • apis_io_searchSTART HERE — APIs, providers and tags for one query, each with its total.
  • resolveTurn a domain, URL or GitHub org into the provider it belongs to.
  • find_cohortsEvery scored population of providers in the catalog.
All 92 tools →

Call it yourself

curl for this page
This API
curl "https://apis.io/api/v1/apis/ieso-registration-facilities-api"
All apis
curl "https://apis.io/api/v1/apis?limit=25"

Discovery needs no key. Ratings and market analysis are Pro.

Get an API key

Free tier, no form to fill in. Signing in shares your email address with us — we store it to create your key and to recognise you if you sign in with another provider. See our Privacy Policy and Terms.

A second provider on the same verified email joins the account you already have.

API entry from apis.yml

apis.yml Raw ↑
aid: ieso:ieso-registration-facilities-api
name: IESO Registration System Facilities API
description: 'A REST API on the Appian-based Online IESO platform for retrieving and maintaining facility
  registration data. SPEC-249 documents the base path https://online.ieso.ca/suite/webapi/ and the facilities
  resource at https://online.ieso.ca/suite/webapi/reg-v1-facilities/, with a sandbox at https://onlinesandbox.ieso.ca/suite/webapi/.
  Authentication is by Appian API key, supplied three ways — HTTP Basic with the key as username-and-blank-password
  (or the reverse), an Appian-API-Key header, or an Authorization Bearer header — over mandatory HTTPS;
  a missing or invalid Authorization header returns 401. There is no self-serve key issuance: the organization''s
  registered IESO Rights Administrator must request an API machine account with "Registration API" access,
  so this is a market-participant-only surface.'
humanURL: https://www.ieso.ca/sector-participants/technical-interfaces
baseURL: https://online.ieso.ca/suite/webapi/reg-v1-facilities
tags:
- Registration
- Facilities
- Market Participants
- REST
properties:
- type: Documentation
  url: https://www.ieso.ca/-/media/Files/IESO/technical-interfaces/registration-system/FacilityAPISpecification-SPEC-249.pdf
- type: Documentation
  url: https://www.ieso.ca/sector-participants/technical-interfaces