In this paper, development of experimental setup to identify the wind velocity deficit due to wake effect of Vertical-Axis Wind Turbine (VAWT) on Horizontal-Axis Wind Turbine (HAWT) in Renewable Energy Research Laboratory Basaveshwar Engineering College, Bagalkote. Downstream turbines have reduced incident energy and momentum. A VAWT causes a wake behind it to extend linearly when a uniform wind strikes it. The free wind will experience a partial reduction in speed from Vup to Vdown. The wake effect in which the incoming wind with speed Vup hits the blades of turbines and creates a wake cone. Downstream wind turbines inside the wake cone experience the velocity deficit in wind speed and extracts lesser power. Energy wake losses typically 5–20%. Results show that 42–23% on HAWT at a various distance. Performance results available from experimental setup of proposed work investigate as distance increases, the velocity deficit decreases, indicating that the wake effect diminishes with distance. The similarity between theoretical and experimental values suggests that the theoretical model is accurate in predicting the wake effects on a Horizontal-Axis Wind Turbine (HAWT) positioned downstream. This aims to estimate the turbulence that leads to extensive power output variations. Evaluation of the energy efficiency and power smoothing of wind turbines.