Ningxia's wind power and PV power both developed rapidly these years. The grid annual time sequence production simulation model containing renewable energy is established, whose target is to maximize energy conservation and emissions reduction benefits, the model considers wind and PV output, load characteristic, unit peak load regulation characteristic and thermal electricity couple characteristic of different heating units. Based on the model, Ningxia power grid renewable energy accommodation capability in 2015 is simulated, and optimized proportion of wind power and PV power considering renewable energy curtailment ratio and energy conservation and emissions reduction benefits is gained. The results provide guidance to the construction of wind and PV power, power system dispatching and policy making.