Industry Benchmark Emission Index (IBEI)

At the request of a number of participants, an Industry Benchmark Emission Index (IBEI) has been defined, which reflects the NEM intensity index adjusted for energy at the regional reference nodes.

The methodology for calculating this is provided below. The IBEI will be calculated on a daily basis and published weekly to the AEMO website in accordance with the timing of the issue of preliminary statements.

Note that the IBEI is not currently included as a supplementary indicator in the CDEII procedure. Consequently any users of the IBEI need to be aware of the important Information and Disclaimer below. In the interim, AEMO intends to provide this data via the AEMO web site only. 


The IBEI is a NEM-wide emission index adjusted for marginal loss factors.
The IBEI is calculated according to the following formula:



IBEI = Industry Benchmark Emission Index for the NEM (t CO2-e/MWh) adjusted for marginal losses.

CDEi = Carbon Dioxide Equivalent emission from a generating unit (t CO2-e) as measured at the connection point for the generator.

Ei = Sent Out Energy (MWh) generated from a generating unit, as measured at the connection point.

MLFi = Marginal Loss Factor applicable for a generating unit for the relevant day.

IBEI files

Files contain daily summarised regional and NEM wide IBEI results.

Important Information and Disclaimer

This Industry Benchmark Emission Index (IBEI) has been published by the Australian Energy Market Operator Limited (AEMO) solely to provide information requested by participants in the national electricity market.

The IBEI is not a part of, and is not a substitute for, the Carbon Dioxide Equivalent Intensity Index published under clause 3.13.14 of the National Electricity Rules. AEMO does not use the IBEI for any purpose under the Rules.

While AEMO has taken care to ensure that the information in the IBEI is as accurate as possible as at the date it was produced, neither AEMO, nor any of its employees, agents and consultants make any representation or warranty as to the accuracy, reliability, completeness or suitability for particular purposes of the information in the IBEI. You should exercise your own care and skill and obtain appropriate professional advice in evaluating the use of that information for any purpose in your particular circumstances.

To the extent permitted by law, AEMO and its advisers, consultants and other contributors to the IBEI (or their respective associated companies, businesses, partners, directors, officers or employees) are not liable for any errors, omissions, defects or misrepresentations in the information contained in the IBEI, or for any loss or damage suffered by persons who use or rely on that information (including by reason of negligence, negligent misstatement or otherwise).

© 2012 – Australian Energy Market Operator. Material in the IBEI may be used in accordance with AEMO’s copyright permissions published on its website.

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