They come on top of already significant increases last July.
The Federal Government’s ETS, twice rejected by the Senate, is behind a big chunk of the latest increases, IPART said.
Rising network costs have also contributed.
IPART confirmed Energy Australia bills will rise 60 per cent, adding $754 to a typical household customer’s bill by 2013.
Integral Energy and Country Energy bills will rise 46 per cent and 64 per cent respectively in the same period, adding $577 and $918 to typical customers’ bills.
But all the increases will be lower if the ETS is scrapped, IPART said.
Over the three years to June 2013, if the ETS is not introduced, average prices will increase by a cumulative total of 20 per cent for Integral Energy, 36 per cent for EnergyAustralia, and 42 per cent for Country Energy, IPART said.
But whatever happens, average prices will increase by seven per cent from July this year for Integral Energy customers, 10 per cent for EnergyAustralia customers and 13 per cent for Country Energy customers.
The increases will apply to everyone on standard tariffs – said to be about 67 per cent of NSW household customers