Dozens of companies from 10 countries are vying with Elon Musk's Tesla to install Australia's largest grid-scale battery to help keep the lights on in the country's most wind-dependent state.

The South Australian state government said on Monday it had received 90 expressions of interest to set up a battery by December with about 100 megawatts of capacity to store wind and solar power.

Energy Minister Tom Koutsantonis said evaluation of the proposals was already underway.

Shortlisted bidders would then be asked to participate in a request for proposal process, he said.