Method 1 underestimates methane pollution from Queensland open cut coal mines and should be phased out. Instead, all coal facilities should be required to report direct measurements from a multi-input model.
While Method 1 is an improvement upon the historical emissions factor for Queensland, it is still wholly inadequate for estimating the methane pollution from Queensland open cut coal mines because:
- State-based emissions factors do not account for the variability of methane pollution from a coal mine; and
- State-based emissions factors disguise major pollution events and methane super emitters, undermining the integrity of NGERS and risking Australia’s climate targets.
Method 1 therefore is likely to be an underestimate of the methane intensity of open cut coal mines across Queensland.