generated: '2026-07-27'
method: searched
source: >-
  Revision History table of the Interface Specification for OASIS v3.04
  (https://www.caiso.com/documents/oasisapispecification.pdf) and the CAISO release
  planning page (https://www.caiso.com/systems-applications/release-planning)
description: >-
  CAISO keeps no developer-facing, dated API changelog. The only versioned change record
  published for the interface itself is the revision-history table inside the OASIS
  Interface Specification, whose most recent entry is version 3.04 dated 2010-12-14 — even
  though the live interface has moved on since (the context path is now /oasisapi and
  report `version` values as high as 12 appear in CAISO's own current FAQ examples). Actual
  change communication for market participants runs through the release planning process
  and market notices, which are dated but are release-level, not API-level. Both records
  are captured here.
scheme: document-revision (major.minor on the interface specification)
current_version: '3.04'
current_version_date: '2010-12-14'
stale: true
stale_note: >-
  The published specification has not been revised since 2010 while the live interface has
  changed; treat the FAQ (which CAISO does keep current) and the access-gated developer
  site as the authoritative description.
entries:
- version: '3.04'
  date: '2010-12-14'
  highlights:
  - Updated section 5 (Reports and XML Data Items) per the Convergence Bidding project.
- version: '3.03'
  date: '2010-11-18'
  breaking: true
  highlights:
  - Renamed report ENE_MKT_RPT to ENE_CB_MKT_SUM and updated its query string.
  - Updated query strings for ENE_CB_AWARDS, ENE_CB_CLR_AWARDS and PUB_CB_BID.
  - Updated group query strings for PUB_CB_DAM_GRP, CB_REF_PRC_GRP and CB_CLR_DAM_GRP.
- version: '3.02'
  date: '2010-06-14'
  highlights:
  - Updated the OasisMaster XML schema.
  - Updated data items for the Atlas APNode and PNode listing reports.
- version: '3.01'
  date: '2010-05-05'
  additions:
  - Net Cleared Convergence Bidding Awards (Energy)
  - Day Ahead Market Summary Report (Energy)
  highlights:
  - Updated the OasisReport XML schema for Convergence Bidding.
- version: '3.0'
  date: '2010-03-24'
  additions:
  - Reference Prices (Prices)
  - Convergence Bidding Awards (Energy)
  - CB Public Bids (Public Bids)
  highlights:
  - Added the CB PublicBids XML schema; updated OasisReport and OasisMaster.
  - Updated the PNode Listing and APNode Listing Atlas reports.
- version: '2.9'
  date: '2010-03-03'
  highlights:
  - AS Results report detail added for HASP posting, effective with AS Procurement in HASP and Scarcity Pricing.
- version: '2.8'
  date: '2009-11-12'
  additions:
  - PRC_CURR_HUB_LMP (current trading hub LMP, download only)
  highlights:
  - Current-price queries no longer require startdate/enddate — the query defaults to the current date.
  - Public Bid postings moved from T+180 to T+90.
- version: '2.7'
  date: '2009-09-28'
  highlights:
  - Section 5 detail added for the Public Bids report.
- version: '2.6'
  date: '2009-05-15'
  additions:
  - Interval Intertie Constraint Shadow Prices
  - Interval Nomogram/Branch Shadow Prices
  highlights:
  - Market Simulation environment URL changed to oasismktsim.caiso.com/mrtu-oasis.
- version: '2.5'
  date: '2009-02-27'
  highlights:
  - AS Clearing Prices and AS Results annotated to note CAISO does not procure AS in the HASP.
  - Tie Point Listing gained a TSIN Name field (OASISMaster.xsd updated).
release_planning:
  url: https://www.caiso.com/systems-applications/release-planning
  note: >-
    Dated, release-level change record for the wider CAISO systems estate — business
    requirements specifications, implementation milestones and market simulation
    structured scenarios. Recent published items observed on 2026-07-27 include the
    Day-Ahead Contingency Analysis as a Service charge draft technical document
    (2026-06-15), Missing Monitoring and Meter Data notice automation business
    requirements (2026-01-23), WEIM market simulation structured scenarios v1.4
    (2025-10-01) and FERC 881 Track 3 business requirements v1 (2025-06-23).