Following a report by the Health Rivers Commission, in 1998 the Minister for Urban Affairs and Planning, Craig Knowles, announced that a small hydro-electric power station would be installed in the Chichester Dam to generate electricity, reduce greenhouse emissions and allow surplus power to be sold back to the State grid.

[7] On 28 February 2011, at the direction of the New South Wales Government,[8] the newly constituted Board of Delta entered into contracts with energy retailer, TRUenergy, for the supply of electricity under Generation Trading Agreements from the Wallerawang and Mount Piper Power Stations.

In July 2013, EnergyAustralia acquired from Delta Electricity Wallerawang and Mount Piper Power Stations, near Lithgow, New South Wales, for A$160 million.

[10] In November 2014, EnergyAustralia announced that it would permanently close Wallerawang due to ongoing reduced energy demand, lack of access to competitively priced coal and the power station's high operating costs.

The NSW Government retained ownership of the decommissioned Munmorah Power Station (Generation Property Management) which is being demolished.