Different from conventional generation, the renewable resource, such as wind or solar generation, is energy-limited and intermittent. It is challenging to identify the capacity credit of renewable generation. A new method has been proposed in this paper to determine the capacity credit for renewable resource in the framework of resource adequacy. An optimization model is developed first to calculate the minimum resource procurement based on the system LOLE (Loss of Load Expectation) criterion. Then renewable generation is added into the generation portfolio to identify the new resource procurement. The capacity credit of the renewable generation is the reduction in the procurement requirement for the conventional resource. The proposed model and method are demonstrated on the IEEE Reliability Test System (IEEE-RTS) system.