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The viability depends on the buy-back rate the power company pays you for power fed back into the grid. Until last week, NSW was paying 60 cents per kilowatt hour, which made a household solar installation pay for itself in about three years, and in profit after that. The rate was changed (for new installations) last week to only 20 cents per kilowatt hour, which is less than the power company sells power for. So now in NSW, there is no point in going solar if you have access to grid power.
Cheers,
Jason.
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