# IESO

**Canonical:** https://apis.io/providers/ieso/  
**Website:** https://www.ieso.ca/  
**APIs profiled:** 9

The Independent Electricity System Operator (IESO) is the Crown corporation that operates Ontario's bulk electricity system and administers the province's wholesale electricity market, balancing supply and demand in real time, running the day-ahead and real-time energy and operating reserve markets, procuring capacity and transmission rights, planning the provincial grid, and delivering the Save on Energy conservation programs. It sits at the top of Canada's largest provincial electricity value chain — upstream of the licensed local distribution companies that bill retail customers — which is why its API posture splits cleanly in two. Its market and system data surface is genuinely open: a public report repository at reports-public.ieso.ca serves 139 report directories of demand, price, generation-by-fuel, intertie flow, outage, adequacy and settlement data as CSV, XML and XLSX over anonymous HTTPS with no account, key or registration, backed by published XSD schemas and a public interface specification. Its programmatic APIs are the opposite: the Axway SecureTransport REST API at reports.ieso.ca/api/v1.4, the SOAP Market Information Management web services, and the Appian-based Online IESO registration, retrofit, dispatch and outage web services are all reserved for registered Ontario market participants with IESO-issued machine accounts. IESO publishes no consumer energy-data API: Ontario's Green Button mandate (O. Reg. 633/21) binds licensed electricity and gas distributors, not the system operator, so there is no retail usage or billing surface here at all.

## Kin Score — 51.8 / 100 (developing)

Scored 2026-08-20 under rubric 0.12.0. Trend: flat (+0.0 from 51.8).

| Facet | Score |
|---|---|
| Discoverability | 83.3 |
| Contract Quality | 45.1 |
| Governance | 4.5 |
| Contract Governance | 4.5 |
| Operational Transparency | 47.4 |
| Developer Ergonomics | 58.9 |
| Commercial Clarity | 34.2 |
| Access Clarity | 34.2 |

Regulatory layer — **Energy & Utilities**: 64.9 (matched via tags).

## Agent readiness — 37.0 (agent-ready)

| Dimension | Value |
|---|---|
| Spec Presence | yes |
| Agentic Access | no |
| Reversibility Documented | no |
| MCP Server | no |
| Auth Clarity | yes |
| Idempotency | no |
| Error Semantics | documented |
| OpenAPI Examples | no |
| Rate Limit Signal | no |
| Event Surface Described | yes |
| Agent Skills | derived |
| Well Known Catalog | yes |
| Consent Identity | no |
| Agent Card | no |
| Dry Run Mode | no |

## APIs (9)

- **IESO Public Reports Repository** — The IESO's open market and system data surface. A flat HTTPS file repository publishing 139 report directories — hourly Ontario and market demand, HOEP and nodal/zonal prices, d...
- **IESO Reports Site REST API** — A RESTful file-access API provided by Axway SecureTransport, used to automate retrieval of reports from the IESO Reports Site. Accepts and returns both JSON and XML, and exposes...
- **IESO Market Information Management (MIM) Web Services** — SOAP web services that let registered Ontario market participants submit and retrieve market information programmatically. The published WSDL (service name emim-web-service, tar...
- **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/weba...
- **IESO Retrofit System API** — A web service API for the Retrofit program under Save on Energy, IESO's conservation and demand management portfolio, allowing participants to integrate with the Retrofit applic...
- **IESO Retrofit Service Provider API** — A companion web service API documented in SPEC-232 for service providers participating in the Save on Energy Retrofit program, covering the service-provider side of project subm...
- **IESO Dispatch Service Web Service** — A web service, specified in SPEC-154, through which registered market participants retrieve dispatch instructions issued by the IESO and send back acknowledgements and responses...
- **IESO Dispatch Notification Service Web Service** — A push-notification web service, specified in SPEC-155, that delivers automated notifications of dispatch instructions to registered market participants rather than requiring th...
- **IESO Outage Coordination and Scheduling System (OCSS) Web Service** — A web service, specified in SPEC-113, for submitting and managing transmission and generation outage requests in IESO's Outage Coordination and Scheduling System. The design spe...

## MCP servers (1)

- **IESO MCP Server**

## Security (3)

- **Ieso Authentication** — none/http/apiKey/oauth2/openIdConnect · 6 schemes
- **Ieso Domain Security** — TLSv1.3 · HSTS · DMARC
- **Ieso Vulnerability Disclosure** — Hackerone · security.txt · contact published

## Tags

Energy, Canada, Electricity, Energy Markets, Grid, System Operator, Market Data, Open Data, Ontario, Demand Response, Renewables

---

Profiled by [API Evangelist](https://apievangelist.com) and published on [APIs.io](https://apis.io/providers/ieso/). Scores are computed from the provider's own public artifacts under a published rubric.