generated: '2026-07-27'
method: searched
source: https://www.oeb.ca/ontarios-energy-sector/open-data
note: >-
  The Ontario Energy Board publishes no API changelog, no release notes and no RSS feed of data
  changes - there is no API to version. What it does publish, and what is captured here, is a dated
  change record for the Open Data programme itself: three signed letters from the OEB to the sector
  announcing each expansion of the programme, each verified live as a PDF on 2026-07-27. Alongside
  them this file records the Last-Modified dates observed on the data files themselves, which is the
  only per-dataset change signal that exists. Everything below is dated and provider-published;
  nothing is inferred.
scheme: dated-letters + file Last-Modified
scope: open-data-programme
current_version: 'Open Data 2.0 (expanded 2024-08-27)'
api_changelog_published: false
api_changelog_note: >-
  There is no versioned API and therefore no API changelog. The RDS query surface carries no version
  segment, no version header and no announcements of any kind - it is an undocumented projection of a
  vendor product and could change without notice.
feed: null
entries:
- version: Open Data expansion 2024
  date: '2024-08-27'
  type: additions
  breaking: false
  title: OEB letter - Open Data expansion
  url: https://www.oeb.ca/sites/default/files/OEB-letter-open-data-20240827.pdf
  verified:
    status: 200
    content_type: application/pdf
    bytes: 168257
    probed: '2026-07-27'
  highlights:
  - Third published expansion of the Open Data programme, continuing the move of Reporting and Record-keeping Requirements (RRR) filings series into open, downloadable files.
- version: Open Data 2.0
  date: '2023-10-06'
  type: additions
  breaking: false
  title: OEB letter - Open Data 2.0
  url: https://www.oeb.ca/sites/default/files/OEB-Letter-Open-Data-2.0-20231006.pdf
  verified:
    status: 200
    content_type: application/pdf
    bytes: 206835
    probed: '2026-07-27'
  highlights:
  - Second phase of the programme, adding further datasets to the initial September 2022 release.
- version: Transition to Open Data
  date: '2022-09-29'
  type: launch
  breaking: false
  title: OEB letter - Transition to Open Data
  url: https://www.oeb.ca/sites/default/files/OEBltr-Transition-to-Open-Data-20220929.pdf
  verified:
    status: 200
    content_type: application/pdf
    bytes: 253503
    probed: '2026-07-27'
  highlights:
  - Launch of the Open Data programme under Ontario's Digital and Data Directive (2021).
  - Datasets published under the Open Government Licence - Ontario, anonymously downloadable with no registration.
- version: Open Data XML-to-Excel guide
  date: '2022-12-15'
  type: documentation
  breaking: false
  title: Guide to importing OEB Open Data XML into Excel
  url: https://www.oeb.ca/sites/default/files/Open-Data-Guide-XML-Excel-20221215.pdf
  verified:
    status: 200
    content_type: application/pdf
    bytes: 1479775
    probed: '2026-07-27'
  highlights:
  - The only developer-facing documentation the programme has ever published, and it targets Excel rather than code.
dataset_freshness_observed:
  note: >-
    Last-Modified dates returned by the files themselves on 2026-07-27 - the per-dataset change signal
    in the absence of a changelog. Full per-file evidence lives on every operation in
    openapi/ontario-energy-board-open-data-openapi.yml.
  samples:
  - dataset: Applications before the OEB (daily register)
    file: https://www.oeb.ca/_html/xml/all_open_appl_Cases_v2_reportFile.xml
    last_modified: 'Fri, 10 Jul 2026 13:39:23 GMT'
  - dataset: Licensed Market Participants
    file: https://www.oeb.ca/_html/xml/all_Licences_report_File.xml
    last_modified: 'Fri, 10 Jul 2026 13:39:20 GMT'
  - dataset: Current Electricity Rates (Residential)
    file: https://www.oeb.ca/_html/calculator/data/BillData.xml
    last_modified: 'Tue, 30 Jun 2026 20:58:39 GMT'
  - dataset: Electricity distributor service areas (GIS)
    file: https://www.oeb.ca/documents/opendata/open-data-electricity-map-20260429.zip
    last_modified: 'Mon, 01 Jun 2026 13:23:39 GMT'
  - dataset: Natural gas distributor service areas (GIS)
    file: https://www.oeb.ca/documents/opendata/open-data-naturalgas-map-20260225.zip
    last_modified: 'Wed, 11 Mar 2026 15:45:05 GMT'
  - dataset: Electricity Distributor Performance Scorecard 2024
    file: https://www.oeb.ca/_html/performance/data/scorecard_data_2024.xml
    last_modified: 'Thu, 25 Sep 2025 20:03:01 GMT'
related:
- lifecycle/ontario-energy-board-lifecycle.yml
- openapi/ontario-energy-board-open-data-openapi.yml