In order to gain more insight from the results, energy saving obtained by employing the GA can be analyzed annually. Considering that in studied warehouse, order arrival rates (order amount per hour) are in low, medium or high levels, annual energy saving can be calculated by multiplying energy saving value per an order with total annual order. It is assumed that daily working hour is eight. Annual energy saving value for different order rates is presented in Table 2. The table also shows approximately percentage energy saving value. It is clear that annual energy saving value increases with high order rates. Given results also show that applying the GA in warehouses would provide significant energy savings if considered globally.