WEM Dispatch v2 APIs Overview

The introduction of the “dispatchIntervalScope” query parameter provides users with the ability to view original market schedules as produced by WEMDE in real time (if applicable) by supplying a value of “Original”. If an interval was subject to the Affected Dispatch Interval process, or had replacement data, a value of “Latest” will return the most recent market schedule for each interval in the dispatch horizon (including the primary). The “status” object will give an indication of the reason for replacement data, if applicable, with values of “AffectedDispatchInterval”, “DispatchEngineFailedToRun” or “MarketAnalystOveride”, otherwise it will be set to “Normal”.

AEMO intend to retire/deprecate the v1 functionality for Dispatch Case and Dispatch Solution APIs around June 2025.

The data provided via the APIs aligns with the publication obligations prescribed in Section 7.13: Settlement and Monitoring Data of the WEM Rules.

2. Data availability 

In the WEM, AEMO manages the dispatch process of Registered Facilities for energy and Essential System Services as described in clause 7.2.1 of the WEM Rules. AEMO produces Scenarios and Market Schedules which enable Market Participants to respond to Dispatch Instructions, make Facility commitment decisions and reconcile market outcomes.

Three Market Schedules exist:

1. Dispatch

2. Pre-Dispatch

3. Week-Ahead

Each Market Schedule has a unique horizon, set of Scenarios and interval granularity. The table and diagram below outline this information.

3. Alternative data sources

AEMO publishes downloadable data sets on the Market Data website. These data sets are publicly available and do not require user authentication.

4. Prerequisites for API access

Before using the WEM Dispatch v1 APIs, you need the following:

• An enabled user account (created by your Market Participant Administrator) attached to a Registered Market Participant (see WEMS MPI User Management User Guide).

• A DigiCert Certificate created and installed for the user account.

For more information, see The Reformer: Accessing our test environments. 

5. API details

Authentication method

The WEM Dispatch APIs use the DigiCert TLS certificate authentication method.  

Base URLs

The base URLs used for the WEM Dispatch v2 APIs are included below: