Abstract: In this work, we have optimized the power dispatch for the extra electronic vehicle loading and the carbon emission by using a commercial PLEXOS software. We have investigated the effects of the EV load on the SEM (Single Electricity Market) with the four different scenarios including peak, off-peak, stochastic, and EPRI, respectively. It was confirmed the EV charging at the peak time presented the highest increasing in the system marginal price, generation costs and total CO2 emissions. The off-peak charging is more beneficial than other charging modes that would contribute 1.54% renewable energy penetration and supply to the 20% emissions reduction target.