The Carbon Dioxide Equivalent Intensity Index (CDEII) is calculated under a formal framework contained within the National Electricity Rules and replaces the informal Greenhouse Intensity Index published by AEMO’s predecessor NEMMCO.
The CDEII calculation combines sent out metering data with publicly-available generator emission and efficiency data to provide a National Electricity Market (NEM)-wide CDEII which is calculated on a daily basis and published weekly to the AEMO website in accordance with the timing of the issue of preliminary statements.
From 1 June 2014, the emission data used in calculating the CDEII changed from estimated to actual emission data via the National Greenhouse and Energy Reporting (NGER) scheme. An impact assessment performed for 2012/13 financial year indicates that this new data source would have resulted in the CDEII result being on average 2.5% higher than the published CDEII. The change to data source should be taken into consideration when analysing the change to CDEII over time. Further detail on this change can be found below under CDEII input data change – June 2014.
CDEII Information update – November 2014
The CDEII information update provides guidance on the structure and application of the CDEII from June 2014.
CDEII Index Results
Index Results - Current Year
The Summary Results File below, for the current year, contains the daily summarised regional and NEM-wide CDEII results. Emission factors used in calculating the CDEII from June 2014 are based on NGER data.
Index Results - Historical
The Summary Results Files below contain the daily summarised regional and NEM-wide CDEII results. Emission factors used in calculating the CDEII to May 2014 are based on estimated data. Emission factors used in calculating CDEII from June 2014 are based on NGER data.
Available Generators File
List of all available generating units for electricity production in the current CDEII reporting week.
AEMO CDEII Procedure
The AEMO CDEII Procedure document describes the methodology used to calculate the CDEII.
CDEII Input Data Change - June 2014
AEMO has produced an impact assessment using a new source of emission data and proposed next steps to integrate this source into planning activities and calculation of the CDEII.
For further information please contact AEMO's Information & Support Hub.