The Energy Supply Footprint shows the greenhouse gas emissions associated with the consumption of electricity and gas by our customers.

The Energy Supply Footprint covers greenhouse gas emissions resulting from the production, transportation, distribution and consumption of electricity and gas throughout the energy supply chain.

Electricity

Carbon dioxide is produced during the generation of electricity from the combustion of fossil fuels such as coal and natural gas.  The emissions associated with losses from the transmission and distribution systems occur at power stations, where additional electricity is generated to cover these losses.  There are no direct greenhouse gas emissions at the consumer end of the supply chain.

The Energy Supply Footprint emissions associated with the provision of electricity have increased with a larger volume of total electricity sales over the period compared with 2006/07.  However, the estimated greenhouse intensity of electricity sold was lower than 2006/07, due lower published emission factors and an increase in gas-fired generation such as TIPS, Oakey and Yabulu Power Stations as part of AGL’s electricity mix.

Generation	Transmission and Distribution	Consumption
36.2 MtCO2e	2.4 MtCO2e	0

 

Gas

In the case of gas supply, greenhouse gas emissions arise from the removal and venting of carbon dioxide at the gas fields, some losses of methane and emissions from the combustion of natural gas as an energy source to produce the gas.  During transmission and distribution there are some fugitive emissions and additional natural gas is used in compressors along the pipelines, generating combustion emissions.  At the consumer end of the supply chain the combustion of natural gas results in the production of greenhouse gas emissions.

The Energy Supply Footprint emissions associated with the provision of gas have increased due to a higher volume of total gas sales from 2006/07.  The estimated greenhouse intensity of gas sold decreased from 2006/07 due to a greater proportion of our gas being sourced from the Surat and Otway Basins which have lower emissions per unit of production at the well head.

Production	Transmission and Distribution	Consumption
2.1 MtCO2e	1 MtCO2e	11.6 MtCO2e