Rule Change RC_2013_15

Key Change

Before 1 February, the WEM Rules required that…

After 1 February, the WEM Rules require that…

As a Participant, I need to be aware that…

1. Opportunistic Maintenance requests

Participants can request Day Ahead Opportunistic Maintenance (DAOM) & On the Day Opportunistic Maintenance (ODOM)

DAOM no longer exists

Opportunistic Maintenance request timeframe:

• maximum of 24 hours and, if more than one outage, each outage must be separated by a period of 24 hours

• from 10:00 AM on the day prior to the Scheduling Day

• by 30 minutes before Balancing Gate Closure

• AEMO will reject all requests for DAOM

• AEMO will reject outage requests for ODOM outside new timeframes

• AEMO will remove DAOM in MPI

• AEMO will update MPI to reflect new timeframes

2. Latest time to request a proposed Planned Outage

Participants must notify AEMO of a proposed Planned Outage or Opportunistic Maintenance not less than 2 Business Days prior to their commencement

Participants must notify AEMO of a Planned Outage:

• for an outage exceeding 24 hours in duration, by 10:00 AM on the day prior to the Scheduling Day; or

• for an outage of up to 24 hours in duration, by 30 minutes before Balancing Gate Closure

• AEMO will reject all requests outside new timeframes

• Participants must submit Opportunistic Maintenance requests in MPI

• New timing restrictions reflected in MPI

• No system changes required

3. Latest time to approve a proposed Planned Outage or Opportunistic Maintenance request

No final deadline defined

Scheduled Outages and Opportunistic Maintenance deemed to be rejected if not approved by 2:00 PM on the day prior to the Scheduling Day or 30 minutes before Balancing Gate Closure for the Trading Interval, respectively

• AEMO will reject all remaining outage requests by the final time, as appropriate

• Participants must submit Opportunistic Maintenance requests in MPI

• After SMST, MPI will be updated to incorporate new timeframes

4. Facilities on the Equipment List

Participants with Facilities less than 10 MW have requests for Outages automatically approved

All Facilities with Capacity Credits must be included on the Equipment List

• AEMO will update the Equipment List

• Before SMST, Facilities smaller than 10 MW that have been assigned Capacity Credits will continue to be automatically approved by AEMO

• After SMST, some Facilities smaller than 10 MW that have been assigned Capacity Credits may be manually assessed by AEMO prior to approval/rejection

5. Definition of an outage, and sequential outages

• If not available from start of approved Planned Outage, then Forced Outage

• Synchronisation time not included in request

• Requirement for new outages extending Planned Outages unclear

• If not available for the entire duration of the approved Planned Outage, then Forced Outage

• Synchronisation time included in request

• Requirement for new outages extending Planned Outages clearer

• New assumptions in outage assessment

• AEMO will remove synchronisation time in PASA methodology

• AEMO will revise internal process for assessment of outages

• After SMST, AEMO will implement change in MPI so that the system will require that Participants review and accept the “availability declaration”

6. New category of Planned Outage

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Mandatory Routine Maintenance is Outage Facility Maintenance that is routine and must be undertaken:

• by a specific point in time; or

• by the time that a specific measure of usage is reached, as required by applicable legislation or in accordance with the relevant Facility’s asset management plan

• Participants will be required to notify AEMO of this type of outage

• No system changes required