Has been and is being done across Europe - and quickly. UK has closed the last of its coal-fired power stations. It uses a mix of nuclear, renewables couple with water storage dams/hydro generation, and gas-fired turbines to meet peak demands.
Only compelling need for coal remains steel production, for which there really is no alternative for the Bessemer process. The rest is economic, not a technical challenge.
Australia could make the switch in under 10 years and possibly 5 if the will was there from the government - but it seems the federal government has turned its back on this subject. AEMO doesn’t want the change either.
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