generated: '2026-07-27'
method: searched
source: >-
  npm, PyPI, RubyGems, CRAN and the IESO technical interfaces page, probed 2026-07-27
note: >-
  IESO ships exactly one first-party client artifact — the MIM Web Services Toolkit (MWT), a
  downloadable Java toolkit distributed as a ZIP from ieso.ca, not from any public package registry.
  There is no IESO organization on npm, PyPI, Maven Central, NuGet, pkg.go.dev, RubyGems, Packagist or
  crates.io, and no IESO GitHub organization (github.com/ieso is Ieso Digital Health, an unrelated UK
  mental-health company — see review.yml homonymTrap). The community has filled the gap with two
  well-known Python grid-data libraries that both ship a dedicated IESO connector against the public
  report repository.
registry_probes:
- {registry: pypi, name: ieso, status: 404}
- {registry: pypi, name: ieso-api, status: 404}
- {registry: pypi, name: ontario-ieso, status: 404}
- {registry: npm, name: ieso, status: 404}
- {registry: npm, name: ieso-api, status: 404}
- {registry: npm, name: node-ieso, status: 404}
packages:
- language: java
  registry: vendor
  name: MIM Web Services Toolkit (MWT)
  url: https://www.ieso.ca/-/media/Files/IESO/technical-interfaces/mp-submissions/MIM%20Web%20Services%20Toolkit%20-%20MWT.zip
  docs: https://www.ieso.ca/-/media/Files/IESO/technical-interfaces/mp-submissions/MWT-User-Guide.pdf
  install: Download the ZIP from ieso.ca and configure ws.client.end.point in the toolkit properties file.
  official: true
  covers: ieso:ieso-mim-web-services
  description: >-
    IESO's own client toolkit for the Market Information Management SOAP web services. The user guide
    documents the configuration property ws.client.end.point (sandbox value
    https://webservices-sandbox.ieso.ca/emim) and the username format user@participantName. Not
    published to Maven Central or any other public registry — it is a direct ZIP download from
    ieso.ca and is usable only by participants holding IESO credentials and an allow-listed IP.
- language: python
  registry: pypi
  name: gridstatus
  version_seen: 0.36.0
  url: https://pypi.org/project/gridstatus/
  repo: https://github.com/gridstatus/gridstatus
  install: pip install gridstatus
  official: false
  covers: ieso:ieso-public-reports-repository
  description: >-
    Actively maintained third-party Python client for ISO/RTO grid data. Ships a dedicated IESO
    connector (gridstatus/ieso.py plus gridstatus/ieso_constants.py) and documented IESO load-data
    examples, reading the anonymous public report repository at reports-public.ieso.ca.
  evidence: >-
    GitHub code search on repo gridstatus/gridstatus for "IESO" on 2026-07-27 returned 20 files
    including gridstatus/ieso.py, gridstatus/ieso_constants.py and docs/Examples/ieso/.
- language: python
  registry: pypi
  name: pyiso
  version_seen: 0.4.0
  url: https://pypi.org/project/pyiso/
  repo: https://github.com/WattTime/pyiso
  install: pip install pyiso
  official: false
  status: dormant
  covers: ieso:ieso-public-reports-repository
  description: >-
    WattTime's Python client library for ISO and other power-grid data sources, with a pyiso/ieso.py
    module that stitches together the public XML/CSV reports at reports-public.ieso.ca to implement
    load, fuel-mix and trade parsers. Last pushed 2024-02-02; treat as dormant but historically the
    reference community integration.
gaps:
- No first-party SDK for the Reports REST API, the Registration/Facilities API or the Retrofit APIs.
- No package-manager distribution of any IESO client; the only official artifact is a ZIP download.
- No IESO GitHub organization, so no source-available reference client.