# IESO Market Information Management (MIM) Web Services

**Canonical:** https://apis.io/apis/ieso/ieso-mim-web-services/  
**Provider:** IESO — https://apis.io/providers/ieso/  
**Base URL:** https://webservices.ieso.ca/emim  
**Documentation:** https://www.ieso.ca/sector-participants/technical-interfaces

IESO Market Information Management (MIM) Web Services is one of 9 APIs that [IESO](https://apis.io/providers/ieso/) publishes on the [APIs.io](https://apis.io/) network. Tagged areas include SOAP, Bids and Offers, Market Participants, and Energy Markets. The published artifact set on APIs.io includes API documentation and SDKs.

SOAP web services that let registered Ontario market participants submit and retrieve market information programmatically. The published WSDL (service name emim-web-service, target namespace http://webservices.ieso.ca/emim/) declares 23 operations covering real-time energy bid upload, query and cancel, operating reserve bids, schedule bids, bilateral contract bids, daily dispatch data, forebay data, resource and market status queries, market messages, an act-as-market-participant operation and a health check. Access requires an IESO UserID and password (formatted user@participantName) plus source IP whitelisting and a client truststore; IESO documents a sandbox endpoint at https://webservices-sandbox.ieso.ca/emim. Neither the production host (webservices.ieso.ca) nor the sandbox host resolved or connected from the open internet on 2026-07-27 (curl exit code 000), consistent with network-level restriction to whitelisted participants. The WSDL and its schema are, however, downloadable anonymously from ieso.ca and are harvested here verbatim.

## Machine-readable artifacts (7)

- **WSDL** — https://raw.githubusercontent.com/api-evangelist/ieso/refs/heads/main/wsdl/ieso-mim-web-services.wsdl
- **XSD** — https://raw.githubusercontent.com/api-evangelist/ieso/refs/heads/main/xsd/ieso-mim-web-services.xsd
- **Documentation** — https://www.ieso.ca/-/media/Files/IESO/technical-interfaces/mp-submissions/MWT-User-Guide.pdf
- **Examples** — https://www.ieso.ca/-/media/Files/IESO/technical-interfaces/mp-submissions/MIM-sample-request-response.zip
- **SDK** — https://www.ieso.ca/-/media/Files/IESO/technical-interfaces/mp-submissions/MIM%20Web%20Services%20Toolkit%20-%20MWT.zip
- **Sandbox** — https://webservices-sandbox.ieso.ca/emim
- **AgentSkill** — https://raw.githubusercontent.com/api-evangelist/ieso/refs/heads/main/skills/ieso-mim-bid-submission.md

## 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 Registration System Facilities API](https://apis.io/apis/ieso/ieso-registration-facilities-api/)
- [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

SOAP, Bids and Offers, Market Participants, Energy Markets

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