Though little change for renewables has been signalled, including the 2GW-a-year wind expansion programme, the tight victory will increase pressure from industry and environmental groups to boost investment returns and speed up clean energy installation.

In the second most closely-disputed election since Brazil's return to democracy in 1989, Rousseff obtained 51.64% of valid votes against 48.36% given to pro-market Aécio Neves of the right-of-centre Brazilian Social Democracy Party (PSDB).

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