Renewable energy production in South Australia has hit the state's target almost eight years ahead of schedule.

The Government's target is for 50 per cent of the state's energy to be supplied from renewable sources by 2025, and in the past year it has been reported 53 per cent of its energy has come from sun and wind-based sources.

South Australian Energy Minister Tom Koutsantonis described the increase as a "good thing" while also attacking the Opposition, claiming they do not have an energy policy.

"I am very pleased with those results. I am pleased that South Australia is leading the nation," Mr Koutsantonis said.

"I am pleased that we're getting most of that renewable investment here in South Australia, it's doing great things.

"It means we are not only leading the nation but probably the world. Renewable energy is the future."

But State Opposition Leader Steven Marshall told ABC Radio Adelaide he was not impressed by the latest reports.

"We've asked the Energy Minister twice in the past two weeks, what was the level of renewable energy in the December quarter," he said.

"He failed to provide Parliament with that answer.

"We have this massive renewable energy in South Australia at the moment, which has delivered the highest prices and the least reliable power in the nation because we haven't managed the transition effectively to renewable energy."

New energy legislation to be debated

The State Government announced last month it would spend more than $500 million to build a new gas-fire power plant and Australia's largest battery to secure the state's energy supply.

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The plan came after the state experienced several blackout and load-shedding.

Mr Koutsantonis said the legislation, which would let the Government direct generators to turn on and give "powers of direction over the interconnector between South Australia and Victoria to maintain system security", would go before the Parliament this week.

"They [the Opposition] have been very silent about it. They have been very silent about whether we should have this power, whether they prefer to have a free market run these issues," Mr Koutsantonis said.

"We were faced with issues here in South Australia where a generator wasn't turned on, remained idle while South Australians went without power. Now that was completely unacceptable, we want to be able to intervene in the market and tell that generator to turn on."

Opposition 'sceptical' of energy bill

Mr Marshall said he was "sceptical" about giving the Energy Minister any "additional powers".

He said the partyroom had not yet decided on a position despite having the legislation for two weeks and would consider it before the debate resumed in State Parliament on Tuesday.

Asked if he supported the building of a gas-fired power plant if the Liberals won the state election in March, Mr Marshalls said he would have to see more details.

"The simple fact is there is already excessive generation capacity in South Australia," he said.

"We would need to be convinced you couldn't go out to the market to get the 250 megawatts of back-up gas generation in SA at a much lower cost than putting the capital place."

If the build was already underway, however, Mr Marshall said the Liberal Party would not "do anything to put taxpayers in a worse situation than they have been put in after 15 years of failed Labor administration".

He did not respond to a question by Mr Koutsantonis about whether or not the Liberals would sell the new power plant.

Mr Koutsantonis said he was confident the legislation would pass with crossbencher support.