Liddell Coal Power Station is located at Lake Liddell near Muswellbrook, in the Hunter Valley, New South Wales, Australia. It is coal powered, with four 500 MW GEC (UK) steam driven turbo alternators for a combined capacity of 2,000 MW.

The first generator was completed in 1971, two more in 1972, and the fourth in 1973. At the time of its completion, Liddell was the most powerful generating station in Australia.

Originally fitted with the then-standard electrostatic precipitators for dust collection, the more efficient Fabric Filters (as used at Eraring, Munmorah units 3 and 4, Bayswater and Mount Piper) were retrofitted in the early 1990s, reducing emissions to a barely visible level.

Much of the coal is supplied by overland conveyors from mines it shares with the nearby Bayswater Power Station.

Liddell Coal Power Station was the first major power station in NSW to be built inland, using fresh water for cooling instead of the more abundant salt water used in coastal power stations. To accommodate this, Lake Liddell was expanded to provide more water.

In addition to the coal power station, Liddell Coal Power Station runs two 25 MW oil-fired gas turbines and a 0.85 MW mini-hydroelectric generator. It is also "licensed to co-fire plant biomass and coal to produce electricity", which essentially means it can use sawdust and wood shavings from the nearby timber industry as a portion of its fuel, replacing up to 5% of its coal requirements. In practice, however, biomass accounts for only about 0.5% of Liddell's output.

A project is underway at Liddell to replace some of the station's boiler feed-water by hot water from a solar thermal array. As of March 2007, the project was at a second-stage prototype but had not been connected to the power station.

Carbon Monitoring for Action estimates this power station emits 14.70 million tonnes of greenhouse gases each year as a result of burning coal. The Australian Government has announced the introduction of a Carbon Pollution Reduction Scheme commencing in 2010 to help combat climate change. It is expected to impact on emissions from power stations. The National Pollutant Inventory provides details of other pollutant emissions, but, as at 23 November 2008, not CO₂.