Why not sell coal instead?

Maybe my understanding is lacking somewhat but if selling electricity isn't making much for AGL might as well sell the coal they own from Loy Yang directly to the global markets instead. Seeing the mine has an annual coal output of 28Million tonnes (as estimated by the vic gov) and the current going price is about $418.75 USD/tonne you figure..

Maybe brown coal is worth alot less and it's not worth their time?

Estimated output:
https://www.mineland.vic.gov.au/mine/loy-yang/#:~:text=Located%20to%20the%20south%20of,of%20approximately%2028%20million%20tonnes.

Current price:
https://tradingeconomics.com/commodity/coal

Surely AGL management has thought of this already? Or maybe not?