Individual Reserve Capacity requirement (IRCR) information

To fund capacity procured through the Reserve Capacity Mechanism, each Market Customer is assigned an Individual Reserve Capacity Requirement (IRCR) obligation based on their contributions to the system peak. The IRCR is calculated monthly, in accordance with Appendix 5 of the Market Rules. An overview of the IRCR is provided in the Reserve Capacity Mechanism section of this website.

Each month AEMO publishes information that can be used by Market Customers to reconcile their IRCR. This information can be found below.

12 Peak SWIS Trading Intervals

The 12 Peak SWIS Trading Intervals are used to determine a Market Customer’s IRCR in accordance with Appendix 5 of the Market Rules. The timestamp refers to the start of the interval (for example, Interval 15:00 is from 15:00 to 15:30).
Market Customers can determine the IRCR contribution of a meter that existed in the relevant Hot Season by:

  1. determining the meter’s median consumption (MWh) within the relevant 12 Peak SWIS Trading Intervals
  2. multiplying by 2, converting it into an average MW quantity
  3. multiplying by the relevant ratios as published monthly. 

Individual reserve capacity requirement ratios

When determining the IRCR for Trading Month n in accordance with Step 8 of Appendix 5 of the Market Rules, the sum of the Market Customers’ Non-Temperature Dependent Loads (NTDL) and Temperature Dependent Loads (TDL) are adjusted by the NTDL_Ratio and TDL_Ratio respectively. The adjusted values are then summed for each Market Customer and multiplied by the Total_Ratio, in accordance with Step 10 of Appendix 5 of the Market Rules. This ensures the sum of all Market Customer Individual Reserve Capacity Requirements equals the Reserve Capacity Requirement.

This information is published in accordance with Market Rule 10.5.1 (f) ix.

4 Peak SWIS Trading Intervals

The 4 Peak SWIS Trading Intervals are used to:

  • determine a Market Customer’s IRCR in accordance with Appendix 5 of the Market Rules; and
  • accept Non-Temperature Dependent Loads (NTDLs) in accordance with Appendix 5A of the Market Rules.

The timestamp refers to the start of the interval (for example, Interval 15:00 is from 15:00 to 15:30).
Market Customers can determine the IRCR contribution of a new meter by:

  1. determining the meter’s median consumption (MWh) within the relevant 4 Peak SWIS Trading Intervals
  2. multiplying by 2, converting it into an average MW quantity
  3. multiplying by either 1.1 for a NTDL or 1.3 for a TDL
  4. multiplying by the total ratios as published monthly

Provision of information for the purposes of IRCR

To help AEMO determine individual reserve capacity requirements in accordance with clause 4.28.7 and update individual reserve capacity requirements in accordance with clause 4.28.11, market customers must, by the date and time specified in clause 4.1.23 or no later than by 5.00 pm on the business day being twenty business days prior to the date and time specified in clause 4.1.28(b), provide to AEMO the information described in clause 4.28.8.

In accordance with the Market Procedure for: Individual Reserve Capacity Requirements, AEMO will provide details on the website as to the nature and format of the data that must be submitted.

Data requirements for IRCR

Market customers must provide the information to AEMO (clause 4.28.8 of the WEM Market Rules) in the following nature and format:

  • An email or letter from the market customer specifying the interval meters (10 digit NMI format) associated with that market customer that the market customer considers AEMO should treat as non-temperature dependent loads (clause 4.28.8(a)). Along with the list of specified interval meters, evidence of intervals operating below capacity due to maintenance or a Saturday, Sunday or a public holiday may also be provided. A sample template can be found here: NTDL-Maintenance Intervals Template.
  • Market customers with changes to the nominations of capacity requirements for intermittent loads should submit a WEMS facility standing data change request with the nominated maximum allowed level of intermittent load and maximum contractual maximum demand, and a letter or email from the market customer providing evidence to AEMO of this contractual maximum demand level.
  • Market customers with no changes to the nominations of capacity requirements for intermittent loads should submit an email or letter from the market customer stating the nominated maximum allowed level of intermittent load and maximum contractual maximum demand applicable for the relevant capacity year, or an email or letter from the market customer stating AEMO may use the values recorded in WEMS for each intermittent load for the relevant capacity year.

For each capacity year, a market customer may only provide AEMO with the information specified in this clause once with respect to each load.

Please address all email correspondence to Market Operations (WA).

Please address all letters to:

Martin Maticka, Group Manager - WA Markets

AEMO (WA)
PO Box 7096
Cloisters Square, Perth, WA 6850

Phone: (08) 9469 9800
Fax: (03) 9609 8080
Email: wa@aemo.com.au

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