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Empirical researchers indicate that the contribution of infrastructure to economic development is significant, especially in the area of long-run economic growth. Taking in consideration the importance of infrastructure to economic strength, infrastructure related topics have become topics of interest for both academicians and policy makers. Nevertheless, documented research on infrastructure development in West Africa - Guinea is rare. This paper explores the current infrastructure development in West Africa - Guinea. The data of the related infrastructure construction was investigated and collected in the statistic department of the republic of Guinea. The Cobb-Douglas production function is used to test the theoretical framework proposed. The findings show that infrastructure has a positive spillover externality to economic long-run growth and more specifically, the electricity consumption has a significant impact on economic grow in the Republic of Guinea. The author suggests that the Republic of Guinea has to invest wisely in infrastructure.