Air emissions - oxides of nitrogen (NOx)

AGL Loy Yang oxides of nitrogen increased 20% compared to FY20. NOx emissions are measured through Continuous Emissions Monitoring Systems (CEMS). The increase in emissions is aligned with the increase in coal combusted (up 15%), and the total electricity production (up 18%) in the reporting period.

Bayswater Power Station oxides of nitrogen emissions increased 17% compared to FY20. Emissions are directly measured through Continuous Emissions Monitoring Systems (CEMS). Bayswater Power Station combustion sources varied compared to FY20: diesel combustion increased 15%, while coal combustion decreased 8%. The increase in diesel combustion is generally associated with start-up of units, resulting in an increase of emissions.

Liddell Power Station oxides of nitrogen emissions decreased 40% compared to FY20. This is in alignment with the change in activity during the reporting period, which was a general reduction in both coal combustion (down 28%) and electricity production (down 31%).

AGL Torrens oxides of nitrogen emissions decreased 12% due to a reduction in the combustion of light fuel oil and pipeline natural gas, and the fact that heavy fuel oil was not combusted on site during FY21.


  • FY21 data was updated in November 2021. A subset of the FY21 data (comprising emissions associated with the combustion of black coal and diesel at the Bayswater and Liddell power stations, black and brown coal as well as natural gas at AGL Loy Yang, and natural gas and fuel oil at AGL Torrens, and estimates of fugitive emissions at these sites) was reported with the initial release of the FY21 Annual Report and ESG Data Centre on 12 August 2021.

  • 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 rounded to the nearest kilogram.

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

  • The National Assets were sold in FY19.

  • Emissions from Kwinana Swift Power Station were included from FY20.

  • Air emissions data for AGL sites is publicly reported NPI data. See

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


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