Bloomberg via Getty Images Malcolm Turnbull is not a fan of South Australia's energy plan.

Prime Minister Malcolm Turnbull has lashed out at South Australia's bold energy plan, labelling it an experiment that illustrates "ideology and idiocy".

Speaking on Saturday, Turnbull told the annual meeting of the SA Liberal Party the state Labor plan was based on dogma and poorly considered.

"Idiocy is just as important as ideology," Turnbull told party faithful in Adelaide.

"What we are doing is not buying a battery at huge expense that would be helpful if you are 100 megawatts short for an hour, but not very helpful if you are, say 150 megawatt short for one hour, or two hours.