Brazilian company Casa dos Ventos is to supply electricity from its 504MW Rio do Vento wind farm to mining giant Anglo American.
The deal covers an average of 95MW of electricity from the project, Casa dos Ventos said.
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Anglo American said the long-term contract will mean that from 2022 it will be able to power its Brazilian operations with 96% renewable energy.
Earlier this month, Vestas agreed a deal with Casa dos Ventos to supply 106 V150-4.2MW turbines for the wind farm.
Rio do Vento, which is located in the Rio Grande do Norte state, is expected to start generating electricity in the second half of next year.