SYDNEY - [AAP] AGL Energy (ASX: AGL) has outlined a plan to replace generation from its ageing Liddell power station with a mix of renewables, battery storage, new gas-fired plants and an upgraded coal-fired plant.

AGL boss Andrew Vesey has told the company's annual general meeting in Melbourne the bulk of energy lost from the forecast closure of Liddell in NSW in 2022 can come from wind and solar.

An upgrade of Liddell's neighbouring Bayswater plant, new gas-fired power plants and battery storage will make up the balance of capacity in a plan Mr Vesey said will be presented to the federal government in December.

The Turnbull government has pressured AGL to keep Liddell open beyond its scheduled 2022 shutdown or sell it to a new operator in order to shore up electricity supply.

AGL chairman Jerry Maycock told the AGM that while it may be "technically possible" to extend the life of the 45-year-old plant the costs "are certain to be substantial" and selling it would be "challenging".

Mr Maycock said the NSW government had intended to close Liddell in 2022 before AGL bought the power station from it in 2014.

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