Tesla's Elon Musk may have garnered maximum publicity with his offer last week to solve South Australia's power crisis for free if he did not deliver with 100 days of signing a contract, but neither the Prime Minister nor South Australia's Premier are in a hurry to take him up on the offer.

Mr Turnbull and Mr Musk spoke for an hour early Sunday afternoon, with the Prime Minister yet to form a view on the merits of power storage systems in solving South Australia's power supply woes.

"They had an in-depth discussion on the value of storage and the future of the electricity system," a spokesman for the Prime Minister's Office said.

Their discussion was not political in tone, but rather a discussion between two people "picking each other's brains" over the options for energy storage in Australia, one source familiar with the discussion said. Mr Turnbull is yet to form a view on the merits of the approach.

Mr Turnbull, who has vowed to take an agnostic approach to energy policy, is understood to be bemused that more work hasn't been put into looking at energy storage solutions.

South Australia's Premier, Mr Weatherill, has also spoken with Tesla's Mr Musk and the pair are expected to speak again in the coming days. Separately, Mr Weatherill said that a number of local and offshore groups have come forward with proposals in recent weeks.

One is the privately owned Lyon Solar, for example, which is finalising plans for a 200-250 megawatt project across four sites in regional South Australia, with land and financing already in place for two of the sites, a spokesman for the company said.

"Just today major global battery suppliers have told me they could deliver a 100 megawatt (MW) on-grid battery in SA for less than the $330 million quoted by Mr Musk," John Grimes the head of the Energy Storage Council said.

"There are over 50 brands active in Australia who could individually or in consortiums, deliver 100MW or more in 100 days of signing a contract."

Lyon Solar is working with AES Storage, for example, to use its systems at the back end of a series of solar farms in South Australia with the potential to be up and running by year's end.

With Victoria's large Hazelwood power station scheduled to close at the end of the month, this could serve to exacerbate South Australia's problems since it may limit the amount of power the state can import during times of peak demand.

"South Australia is the global epicentre for the imminent take-off of large-scale battery-based energy storage, which can solve power challenges like SA's in months, not years," said Lyon Partner David Green.

"Multiple companies are sure to join the market, but Lyon is the only company close to being ready to build and be operational before next summer."

AES supplied large battery systems to California last year when gas supply constraints posed a threat to its electricity supplies, as did Tesla, for example.