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Environment

Air emissions - oxides of nitrogen (NOx)

Emissions from AGL Torrens (which includes the Barker Inlet Power Station) decreased 3% compared to FY19. The reduction is in part due to 15% lower total pipeline natural gas combusted at the facility. Emissions produced at the Barker Inlet Power Station contributed approximately 11% of the total emissions of AGL Torrens. Emissions from the Barker Inlet Power Station are mainly due to the combustion of pipeline natural gas.

Emissions from the Loy Yang A Power Station decreased 8% compared to FY19. Emissions of NOx are measured by Continuous Emissions Monitoring Systems (CEMS), and align with the reduction in coal combusted (down 9%), and electricity produced (down 9%).

Emissions from the Bayswater Power Station decreased 7% compared to FY19 as measured by lower CEMS figures for NOx, which aligns with the reduction in total fuel combusted at the facility, down approximately 7%. Emissions from the Liddell Power Station increased 19% compared to FY19, and can be attributed to increased fuel combustion and electricity production, as well as a slightly higher nitrogen content in the coal (1.26% measured in FY19 compared to 1.27% in FY20).

Newcastle Gas Storage Facility NOx emissions decreased due to a 98.5% decrease in gas flaring compared to FY19.

Notes

  • FY20 data was updated in December 2020. A subset of data (comprising emissions associated with the combustion of black coal at Bayswater and Liddell power stations, black and brown coal as well as natural gas at AGL Loy Yang Power Station, and gas and fuel oil at AGL Torrens) was reported with the initial release of the FY20 Annual Report on 13 August 2020.

  • For the purposes of this data set, AGL Torrens comprises the Torrens Island Power Station and the Barker Inlet Power Station which commenced operation in December 2019.

  • All figures have been restated to the nearest kilogram.

  • Continuous Emission Monitoring System (CEMS) was introduced to Units 2, 3 and 4 at Bayswater Power Station in November 2017.

  • Air emissions data for AGL sites is publicly reported NPI data. See www.npi.gov.au

  • The emission factors used in AGL's NPI reports are sourced from relevant industry emission estimation technique manuals available on the NPI website.

  • Wallumbilla LPG Plant became operational in 2016 hence NPI reporting commenced for this site in FY17.

  • Kwinana Swift Power Station was purchased by AGL in FY20.

  • The National Assets were sold in FY19.

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