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National Greenhouse Accounts (NGA) Factors

Department of Climate Change, 2008

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Introduction

The National Greenhouse Accounts (NGA) Factors has been prepared by the Department of Climate Change and replaces the AGO Factors & Methods Workbook. The NGA Factors is designed for use by companies and individuals to estimate greenhouse gas emissions for reporting under various government programs and for their own purposes. Unless otherwise stated, the methods for calculating emissions listed in this document are "Method 1" from the National Greenhouse and Energy Reporting (Measurement) Determination 2008 and the National Greenhouse and Energy Reporting (Measurement) Technical Guidelines 2008 v1.1. The Technical Guidelines are available on the Department of Climate Change website and have been designed to support reporting under the National Greenhouse and Energy Reporting Act 2007.

While drawing on the National Greenhouse and Energy Reporting (Measurement) Determination 2008, the methods described here in the NGA Factors have a general application to a broader range of greenhouse emissions inventories.

The default emission factors listed in these Guidelines have been estimated by the Department of Climate Change using the Australian Greenhouse Emissions Information System (AGEIS) and are determined simultaneously with the production of Australia's National Greenhouse Accounts. This ensures that consistency is maintained between inventories at company or facility level and the emission estimates presented in the National Greenhouse Accounts. The emission factors are referred to in this document as National Greenhouse Accounts (NGA) default emission factors.

More information on the estimation methods employed in the National Greenhouse Accounts is available in the Australian Methodology for the Estimation of Greenhouse Gas Emissions and Sinks series. The methods used at the national level, and reflected in the factors reported here, are consistent with international guidelines and are subject to international expert review each year.

Reporters under the National Greenhouse and Energy Reporting System may utilise NGA default emission factors listed in the Technical Guidelines in the preparation of emission inventories or they may choose to utilise information on emission factors available at facility level, under certain conditions. Guidance is provided to assist Reporters that choose to use their own information on emission factors. See the Technical Guidelines for more details. The emission factors reported in this publication replace those listed in the NGA Factors, released in January 2008. Updated factors and methods in this document correspond to those detailed in the National Greenhouse and Energy Reporting (Measurement) Determination 2008.

Past published emission factors reflected the best information available at the time of their release and may remain valid for particular programmes. Updates to emission factors for past years presented in this document do not necessarily imply any need to revise estimates of emissions for previous years - approaches to updating past emission estimates will depend on the particular details of individual greenhouse reporting programs.

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