Smart grid systems have gained a great popularity in these days all over the world. Although the technical infrastructure is an important issue, the economic benefits of the system should also be considered. Therefore, this study is focused on the evaluation of cost-benefit analysis of smart grid systems. As a case study, wind turbines are examined in the study constructed in Turkey. The general approaches to cost-benefit analysis are to calculate and compare the benefits and the costs for wind turbines. For this purpose, comparison of different wind turbine models are examined in terms of the cost of produced power at first. Then, efficient operating life of turbines and annual average operating capacity factors are considered. Finally some outcomes are given about cost benefit analysis of future wind turbines in the smart grid systems.