Abstract: The increasing integration of renewable energy sources may lead to significant capacity deficiencies in power systems. Aggregated and coordinated generic energy storage resources is essential for addressing this issue via capacity markets. This paper discusses the credibility enhancement of capacity credit of generic energy storage. Firstly, a generic energy storage model is proposed to achieve the unified modeling of batteries, thermostatically controlled loads, and electric vehicles. Meanwhile, the decision-independent uncertainty modeling of operation status and baseline consumption, and the decision-dependent uncertainty modeling of available energy capacity are incorporated. Then, this paper presents a capacity credit evaluation method of generic energy storage under the decision-dependent uncertainty, where a sequential coordinated dispatch is raised to achieve the trade-off between the day-ahead self-energy management of generic energy storage and the real-time adjustment to system capacity deficiency. Additionally, the response unavailability assessment effectively enhances the credibility of evaluation. Finally, the effectiveness, superiority and credibility of the proposed method are verified in the case study, which provides an effective evaluation method for the future capacity market.