Many studies about offset printing plate surface energetics have dealt with determinations of the difference between image and non-image areas through contact angle measurements. On another hand, contact angle hysteresis studies have highlighted the influence of surface state and/or heterogeneity. The novel approach of Shanahan and Di Meglio expresses hysteresis as a function of surface defects parameters. In the case of offset printing plates we have considered screen dots as defects, and we have evaluated the corresponding hysteresis energy by the use of some liquids such as pure water, glycerol and a series of fountain solutions. The experimental results turned out to validate this approach and to show the way this energy is linked to the screen geometry and the relative dot area. In parallel with this new approach, we have also shown that the classical Cassie and Baxter model of averaging effects may be applied to liquids on screened areas.