A retailer can sign multiple contracts with participation in demand response program (DRP). The energy
sources considered for retailers include pool market and forward contracts. In this paper, several new
DRP schemes are proposed for a retailer which is containing pool-order DR, forward DR and rewardbase DR. proposed model is an agreement that retailer will participate it, if is useful. Pool market price
uncertainty modeling is one of the main challenges in power system modeling which information gap decision theory (IGDT) is proposed for this uncertainty. In IGDT approach, the robustness and opportunity
functions are used to study of different strategies in the presence of pool market price uncertainty. Robustness function is used in the risk-averse strategy while opportunity function is used in the risk-taker
strategy. The proposed IGDT risk-constraint strategies of electricity retailer in presence of pool-order DR,
forward DR and reward-base DR are modeled via mixed-integer non-linear programming which is solved
using SBB solver under GAMS optimization software. To validate the proposed model, two cases are studied and positive effects of proposed DR scheme on the risk-averse, risk-neutral, risk-taker strategies are
investigated, and the results are compared with each other.