THE revised $40million Wainisavulevu Weir Raising Project will enable the FEA to optimise water usage and help it meet the 138MW demand for electricity on Viti Levu.
The project which commenced construction in late 2011 will result in the height of the Wainisavulevu Weir extended by a height of eight metres allowing it to store more water.
Initially estimated to cost $27.8million, the project — a partnership between FEA and Chinese company Sinohydro — had its cost revised to $40million following further surveys at the site.
Project team member Jone Feresi said the weir would be able to store more water than it could currently when the project was completed.
"The current capacity of the Wainisavulevu weir is about 0.5million cubic metres and upon completion of this project, the weir should be able to store 10 times that amount," Mr Feresi said.
He said a big part of the project was the construction of a soil core dam at the same extended height of the weir to help in the storage of the water.
Mr Feresi explained the Wainisavulevu weir was one tributary that supplied the Wainikasou power station and also the Monasavu dam.
"The water from Wainisavulevu flows to the Wainikasou power station where it powers two turbines capable of producing a maximum of over 6MW of power.
"The water then flows on to the Monasavu dam where it can be transported to power the turbines at the Wailoa power station."
The project is expected to provide the Viti Levu grid with an average additional energy yield of 10GWh per annum with a maximum of 21 GWh per annum.
Mr Feresi made these explanations while hosting journalists to a tour of the weir and other parts of the Monasavu catchment area yesterday.
The media tour was part of the FEA's buildup to the 30th anniversary of official operation at the Monasavu Hydroelectric Scheme.