Big businesses cashing in on Australia's charge towards a solar future are cementing renewables as mainstream, experts say.

Supermarket giant Aldi is the latest to join the rush, flagging plans to sell solar panels and battery packages on the heels of Bunnings and IKEA developing installation arms.

Despite more than 4.2 million Australians having already put solar on the roof and 300,000 new installations being added annually, renewables uptake in the commercial and industrial sectors has been comparatively slow, Green Energy Council's Con Hristodoulidis says.

But that is changing.

Mr Hristodoulidis says the solar industry has become "the clothesline that we have in our backyard".

"When big chain supermarkets and hardware stores like Bunnings and IKEA get into it, it shows you that so

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