generated: '2026-07-27'
method: searched
source: https://www.aeso.ca/market/market-updates
docs: https://www.aeso.ca/market/market-updates
summary: >-
  AESO publishes no dedicated API changelog or release-notes page. API changes are announced as
  dated posts in the general Market Updates stream at https://www.aeso.ca/market/market-updates,
  mixed in with generator asset notices, maximum-capability changes and market advisories. The
  Azure APIM developer portal at https://developer-apim.aeso.ca/ carries no release-notes page.
  The entries below are the API-affecting Market Updates found on 2026-07-27, captured verbatim
  from their published text. No AESO API change was announced during 2026 as of this capture.
scheme: uri-path
scheme_note: >-
  Version lives in the gateway path segment (…/public/<api>/v1, /v1.1, /v2). Two APIs have shipped a
  second major version: Current Supply Demand (v1 asset detail, v2 summary) and Unit Commitment Data
  (v2 only; v1 retired). No version header, no date-based versioning, no version negotiation.
current_versions:
- api: Pool Price Report
  version: v1.1
- api: System Marginal Price Report
  version: v1.1
- api: Current Supply Demand
  version: v2 (summary) / v1 (per-asset generation)
- api: Unit Commitment Data
  version: v2
- api: Actual Forecast Report
  version: v1
- api: AIES Gen Capacity
  version: v1
- api: Asset List
  version: v1
- api: Energy Merit Order Report
  version: v1
- api: Intertie Public Reports (ITC)
  version: v1
- api: Load Outage Forecast
  version: v1
- api: Metered Volume Report
  version: v1
- api: Operating Reserve Offer Control Report
  version: v1
- api: Pool Participant
  version: v1
entries:
- title: New Version - Current Supply Demand API
  url: https://www.aeso.ca/market/market-updates/2025/supply-demand-api-proposed-changes/
  year: '2025'
  effective: '2025-07-30'
  breaking: true
  additions:
  - Current Supply Demand API new version published with label changes in the last_updated_datetime
    field in the response.
  removals:
  - Current Supply Demand - v1 unavailable after 2025-09-30.
  - Unit Commitment Data API - v1 no longer available effective 2025-07-30; v2 is the only accessible
    version.
  highlights: >-
    "Effective July 30, 2025 the Current Supply Demand API will have a new version with label changes
    in the last_updated_datetime field in the response. The original version, Current Supply Demand -
    v1 will be unavailable after September 30, 2025." The same notice confirms the Unit Commitment
    Data API v1 retirement.
- title: Reminder - API Changes
  url: https://www.aeso.ca/market/market-updates/2025/reminder-api-changes/
  year: '2025'
  effective: '2025-03-31'
  breaking: true
  removals:
  - Legacy Swagger API Gateway decommissioned; no longer accessible.
  additions:
  - All public report APIs served from the Azure APIM API Gateway (apimgw.aeso.ca) behind a
    self-serve subscription key.
  highlights: >-
    "The transition from the Swagger Application Programming Interfaces (API) Gateway to the Azure
    Gateway is complete. As of March 31, public reports accessed through API must align with the
    updated Azure APIM API Gateway infrastructure, as the old Swagger API Gateway is no longer
    accessible. This change was implemented as part of a technology modernization initiative."
- title: Notification of API Changes
  url: https://www.aeso.ca/market/market-updates/2025/notification-of-api-changes/
  year: '2025'
  breaking: true
  additions:
  - Advance notice of the twelve public report APIs migrating to the Azure APIM Gateway (Interchange
    Outage Report, Interchange Capability Report, Pool Price Report, System Marginal Price Report,
    Pool Participant API, Operating Reserve Offer Control Report, Metered Volume Report, Energy Merit
    Order Report, Actual Forecast Report, Current Supply Demand, Asset List API, Unit Commitment Data
    API).
  highlights: >-
    The pre-announcement of the gateway migration completed on 2025-03-31, listing every API moving
    to Azure APIM and pointing at https://developer-apim.aeso.ca/ plus the APIM API Gateway
    Instructions PDF.
- title: Energy Trading System (ETS) - Unit Commitment Directives Report Update
  url: https://www.aeso.ca/market/market-updates/2025/energy-trading-system-ets-unit-commitment-directives-report-update/
  year: '2025'
  effective: '2025-04-16'
  breaking: true
  additions:
  - Current Unit Commitment Directive report added alongside the historical report.
  - Report and API columns are Asset ID, Issued Time, Begin Time, Operation Start Time, Operation End
    Time.
  removals:
  - Columns "Unit Commitment Start Time" and "Unit Commitment End Time" replaced by "Operation Start
    Time" and "Operation End Time".
  highlights: >-
    Implemented in accordance with the Alberta Utilities Commission's final approval of Section 206.2
    of the ISO rules. "APIs associated with the reports will be updated to reflect" the new columns.
- title: Energy Trading System (ETS) - Reports and APIs Updated to Remove Coal and Dual Fuel
  url: https://www.aeso.ca/market/market-updates/2024/energy-trading-system-ets-reports-and-apis-updated-to-remove-coal-and-dual-fuel/
  year: '2024'
  effective: '2024-11-18'
  breaking: true
  removals:
  - CSD Summary API (current endpoint) no longer returns Dual Fuel or Coal.
  - AIES Gen Capacity API no longer returns Dual Fuel or Coal fuel types.
  additions:
  - CSD Summary API Gas summary split out into its fuel subtypes.
  highlights: >-
    "Effective Nov. 18, the AESO has removed the now-unused Coal and Dual Fuel categories from the
    Current Supply and Demand (CSD), Monthly Outage, Daily Outage, and 7 Days Hourly Available
    Capability public reports... Concurrent to the ETS report changes, the supporting APIs have
    changed."
- title: Energy Trading System (ETS) - New Unit Commitment Directives Report
  url: https://www.aeso.ca/market/market-updates/2024/energy-trading-system-ets-new-unit-commitment-directives-report/
  year: '2024'
  effective: '2024-11-18'
  breaking: false
  additions:
  - New public Unit Commitment Directives report in ETS (no digital certificate required).
  - New Unit Commitment Directives API, deployed a few hours after the ETS report release.
  highlights: >-
    "Will also be accessible through a new Unit Commitment Directives API." Directives are published
    60 days after the Unit Commitment End Time.
gaps:
- No API-only changelog feed, RSS or release-notes page; API changes must be found inside the general
  Market Updates stream.
- Market Update posts do not carry a machine-readable published date in the page body; dates below
  are the effective/cutover dates stated in the text and the year path segment of the URL.