South Australia's Liberal Opposition has promised to scrap the state's target to source half its energy from renewable sources.

Leader Steven Marshall joined Liberals in Victoria and Queensland with a pledge to replace local targets with one set by the Federal Government.

Mr Marshall said South Australia's 50 per cent renewable goal had not improved electricity security or kept power bills in check.

"We want to restore affordable, reliable power to our state and we want to do it as soon as possible," he said.

The Liberals would consider more coal or gas generation if it would prevent further blackouts.

"We're not removing any options because of obsessive ideologies, that hasn't worked for us. Labor has put South Australia in a perilous situation," Mr Marshall said.

South Australia's renewable energy target began in 2009 with a goal of 33 per cent by 2020, however that was upgraded to 50 per cent by 2025 when the target was achieved early, in 2014.

Port Augusta's Northern coal-fired power station has since closed, while Victoria's Hazelwood coal-fired station is due to shut in March.

The Australian Energy Market Operator (AEMO) is forecasting a shortfall in power supply in both South Australia and Victoria in early 2018.

"We're very concerned about AEMO's latest report, which shows more blackouts are on their way to South Australia," Mr Marshall said.

"There is a massive shortfall because Labor has done everything it can to drive out affordable, baseload power from South Australia."

Plan would stop investment in SA: Koutsantonis

Energy Minister Tom Koutsantonis said abolishing the target would not help South Australians.

"All it would do is help the coal cartel, and it kills solar thermal in Port Augusta or any part of this state, forever," Mr Koutsantonis said.

"The dream of renewable energy that is dispatchable, that has storage and can be baseload, has just been pierced through the heart by Mr Marshall."

"Do we really want to put this future in the hands of people like [Prime Minister Malcolm] Turnbull and [Energy Minister Josh] Frydenberg, people who carry lumps of coal around in the Federal Parliament?"

Mr Koutsantonis acknowledged that the state's renewable target had no mechanism, but led to projects that were funded through federal subsidies.

"[This plan] stops people from investing in South Australia," he said.

The Government also said there would be enough power in the state in early 2018, through increased use of the Pelican Point power station and its own measures still to be announced.