<p>The objective of this paper is to enhance the performance of vertical-axis wind turbines using the blade design. The two-dimensional study of the straight and the twisted H-Darrieus-type blades is analysed using Reynolds Average Navier–Stokes equation with k epsilon turbulence model. This study analyzed the lift, drag coefficient, and optimum blade twisting angle to enhance blade performances. The result shows that the twisted blades enhance the lift coefficient by up to 7% and minimise the drag coefficient by 4% compared to the straight blade. Also, the maximum performances are achieved at the blade twisting angle of 16°. The novelty of the work is to analyse the optimum blade angle and compare the performance of the twisted and straight blades with different angles of attack. The application of the proposed blade can be used in any kind of wind turbine to enhance the coefficient of power at various angles.</p>