Liddell power station: Closure to significantly add to household power bills News by John Rolfe Premium Content Subscriber only The closure of NSW's Liddell coal-fired power station will add nearly $100 a year to average household electricity bills from 2022, new modelling by the Australian Energy Market Commission reveals. The eight per cent increase comes from a rise in wholesale costs caused by tightening in supply once AGL follows through on its plan - announced in 2015 - to shut the facility near Muswellbrook in the Upper Hunter at the end of its technical 50-year life. The AEMC's new report estimates that after the closure the peak wholesale price in NSW will be nearly $150 per megawatt hour compared to less than $110/Mwh in 2021.