Why doesn't Australia use Solar Power only for electricity Since most of Australia is a hot sunny desert?

All you need for a solar power plant to generate electricity is a lot of mirrors
(mirrors that a central computer rotates throughout the day to reflect the sunlight from the best angle to heat the water tank) to reflect the sunlight onto a huge water tank to heat the water that turns the generator.
Update: all you need for solar electricity is about 100 mirrors Maximum
How expensive can it be
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