This paper investigates the impact of demand response resources (DRRs) as the consequence of implementing demand response programs (DRPs) on power markets. Indeed, this paper incorporates comme rcial concept of DRPs with unit commitmen t (UC) to solve ‘‘unit and DR commitment’’ problem. This mixed problem will decrease the network operation cost by using of DRPs’ potential to mitigate some UC constraints and avoiding some highly priced generation of units. Here, employing the proposed DRPs model is considered as a new concept in electricity market. In this paper, a dynamic approach is proposed for participa ting DR service providers in power markets in order to maximize their profits. This paper also aims to concurrently consider the aforementioned comme rcial DRPs supply model with the generators supply curves in the unit commitment problem, which is solved to minimize operational costs considering multifarious constraints. Performance of the proposed approach is investigated through numerical studies using a standard IEEE 10-unit test system. The results show the efficiency and advantage of the proposed methodol ogy.