# IESO Registration System Facilities API

**Canonical:** https://apis.io/apis/ieso/ieso-registration-facilities-api/  
**Provider:** IESO — https://apis.io/providers/ieso/  
**Base URL:** https://online.ieso.ca/suite/webapi/reg-v1-facilities  
**Documentation:** https://www.ieso.ca/sector-participants/technical-interfaces

IESO Registration System Facilities API is one of 9 APIs that [IESO](https://apis.io/providers/ieso/) publishes on the [APIs.io](https://apis.io/) network. Tagged areas include Registration, Facilities, Market Participants, and REST. The published artifact set on APIs.io includes API documentation.

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.

## Machine-readable artifacts (2)

- **Documentation** — https://www.ieso.ca/-/media/Files/IESO/technical-interfaces/registration-system/FacilityAPISpecification-SPEC-249.pdf
- **Documentation** — https://www.ieso.ca/sector-participants/technical-interfaces

## Other IESO APIs (8)

- [IESO Public Reports Repository](https://apis.io/apis/ieso/ieso-public-reports-repository/)
- [IESO Reports Site REST API](https://apis.io/apis/ieso/ieso-reports-site-rest-api/)
- [IESO Market Information Management (MIM) Web Services](https://apis.io/apis/ieso/ieso-mim-web-services/)
- [IESO Retrofit System API](https://apis.io/apis/ieso/ieso-retrofit-api/)
- [IESO Retrofit Service Provider API](https://apis.io/apis/ieso/ieso-retrofit-service-provider-api/)
- [IESO Dispatch Service Web Service](https://apis.io/apis/ieso/ieso-dispatch-service-web-service/)
- [IESO Dispatch Notification Service Web Service](https://apis.io/apis/ieso/ieso-dispatch-notification-service/)
- [IESO Outage Coordination and Scheduling System (OCSS) Web Service](https://apis.io/apis/ieso/ieso-ocss-web-service/)

## Tags

Registration, Facilities, Market Participants, REST

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Profiled by [API Evangelist](https://apievangelist.com) and published on [APIs.io](https://apis.io/apis/ieso/ieso-registration-facilities-api/). The API's provider profile, Kin Score and agent-readiness rating are at https://apis.io/providers/ieso/.