In the new era of smart grid in power system, demand side management (DSM) plays a vital role which helps the customers to make the right decision regarding their power consumption thus minimize the peak load demand and provide the best load profile. Due to DSM carbon emission level and financial cost has been deduced. This paper represents a strategy on load shifting technique for demand side management for commercial customers of future smart grids. A complete methodology for implementing a DSM program has also been outlined. Case study has been carried out taking Ahsanullah University of Science and Technology (AUST), Dhaka as a commercial customer. Results prove that implementation of proposed methodology would provide substantial economic benefit to customer and distributors.