THE FEA will spend about $10million to replace four power transformers that have been in operation for the past three decades.
It is part of the Half-Life Refurbishment of the Monasavu Hydro Scheme, scheduled to start last night.
Authority CEO Hasmukh Patel said the Wailoa Power Station formed part of the scheme and the station had four 20MW turbines which produced bulk of the energy supplied in Viti Levu.
"Associated with these power turbines are four power transformers which have been in operation for some 30 years now," Mr Patel said in a statement, adding the transformers needs to be replaced.
He said the design, manufacture, supply, testing, shipping, installation and commissioning of the four new 25MVA, 11kV/140kV, 50Hz, generator transformers with off-load tap changer at Wailoa Power Station was awarded to Siemens New Zealand in 2012.
He said Siemens was selected out of the five potential bidders.
He added the installation of the new power transformers was expected to be completed by October 14.