<https://about.newenergyfinance.com/blog/tractebel-sees-brazil-power-rationing-in-2015-if-no-rain/#webpage>
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"The key variable will be rainfall from January to April, which typically accounts for about 60 percent of the water inflow in the country’s hydropower dams, said Manoel Zaroni, chief executive officer of Brazil’s biggest private energy generator Tractebel Energia SA."
<https://about.newenergyfinance.com/blog/tractebel-sees-brazil-power-rationing-in-2015-if-no-rain/>