Air emissions - lead (Pb)
AGL Loy Yang emissions of lead increased by 11%. Air point source lead emissions are calculated using 3-year rolling stack test data, and total operating hours of each generator unit. In line with the increase in electricity produced at the facility (up 18%), lead point source emissions increased 18%. Fugitive emissions of lead have increased 8% compared to FY20.
Bayswater Power Station emissions of lead increased by 13%. Emissions of lead were calculated using data from stack testing across the reporting period, and total gas flow allocated to each unit. The increased lead emissions can be attributed to minor variances in the stack testing data.
Liddell Power Station emissions of lead increased 3% compared to FY20. This is in contrast to the decrease in electricity produced at the facility (down 31%). The increase is mainly due to fugitive sources, which increased 63% compared to FY20, mainly due to an increase in wind-blown dust from open areas, and dust produced from vehicle movement about site.
Torrens Island Power Station emissions of lead decreased by 32%. Emissions are mainly produced by the B1-B4 turbines, each of which saw a reduction in total pipeline natural gas throughput, with the exception of Unit B3. In addition, the removal of heavy fuel oil from Torrens Island Power Station contributed to the reduction in lead emissions observed 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.
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 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.