CS Energy is wrapping up a $13.5 million major overhaul at its pumped storage hydroelectric Wivenhoe Power Station near Fernvale in south-east Queensland.
The Unit 1 overhaul has involved more than 90 contractors, used more than 100 tonnes of scaffolding, 50 tonnes of garnet for sandblasting and 2300 litres of paint.
Key works include the replacement of the draft tube bearing, internal pump painting, replacement of the guard gate rollers at Splityard Creek Dam and replacement of the generator transformer high voltage protection system.
More than 45,000 hours have been worked, with the focus now shifting to returning the unit to service in the next two weeks.
The major overhaul contractors were MHPS Plant Services, Crown Engineering, McElligotts Painting and Berg Engineering.
CS Energy chief executive officer Martin Moore said the overhaul would ensure the power station operated safely, reliably and efficiently into the future.
“Wivenhoe Power Station is a peaking power station that has provided quick start capacity to the national electricity grid since 1984,” Mr Moore said.
“The power station works like a giant rechargeable battery by cycling water between an upper and lower reservoir.
“Wivenhoe’s upper reservoir, Splityard Creek Dam, has a capacity of 23,300 megalitres, which is enough to run the power station for up to 10 hours at full load.”
Wivenhoe Power Station is the only pumped storage hydroelectric plant in Queensland and consists of two 250MW units that are the largest hydro machines in Australia, with each having almost 1,500 tonnes spinning when in operation.