The first generator has generated 1.1 billion kWh since it was officially commissioned four months ago.
With six turbine groups and a combined capacity of 2,400 MW, Son La is the biggest hydroelectric power project in Vietnam and Southeast Asia with a total investment capital of some VND42 trillion, (US$2.1 billion).
The plant is expected to supply the economy with 10.2 billion kWh of power a year once it swings into full operation in 2012.