The Net Present Economic analysis from an investment with cash flow analysis describes the cash flow return o
investment during the utilization of wind turbine. All calculations are based on various assumptions in the future
such as production annual energy of wind turbine, price energy, and recent inaccurate bank rate level. Therefore
economic analysis follows the sensitivity analysis which considers the risk and opportunity in investment. The NPV
is the sum of all discounted cash flows associated with the project. The general equation is written as [3, 4]: