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The rapid growth of the wind industry in Brazil presents new opportunities and challenges for its electricity industry. As new capacity becomes available, more transmission infrastructure is required for security of supply. The Brazilian electricity system has experienced congestion in the northeast region, affecting the coordinated expansion of transmission and new wind power capacity. This paper uses a simulation model for better assessing long-term policy synchrony of the wind industry. The simulation shows that the resulting prices are competitive in the middle to long terms. • Wind power farms have been affected by insufficient grid availability. • This paper proposes a model to assess the expansion of transmission in Brazil. • The paper undertakes the supply chain view. • Lack of coordination along the supply chain is problematic. • A synchronised policy has a positive effect on expansion. [ABSTRACT FROM AUTHOR]