You can’t completely remove your demand for electricity but you can buy it from renewable sources.
Most major electricity vendors in Australia can supply you with Green Power. Green Power comes from renewable sources and is part of a government accreditation program.
Green Power is purchased via an additional charge on a per kWh basis for electricity used.
To switch to Green Power simply call your electricity provider.
Greenpeace recently published The Green Electricity Guide which helps you identify electricity providers which are more actively embracing renewable energy sources over fossil fuels.