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The turbine is the 38th of 50 due to begin operating at the complex by 2015, according to federal gazette Diário Oficial da União.
Located in Rondônia state, Jirau is being built alongside the 3.15GW Santo Antônio plant on the Madeira river.
The federal government says the mega-complex is vital to helping Brazil meet future power demand, which is expected to grow by 7GW/y until 2020.
More information, in Portuguese, can be seen here.