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The variability of renewable energy generation and its mismatch with demand may lead to curtailment issues, which necessitates the deployment of energy storage on a significantly larger scale. A‐CAES is a promising technology for its green ability and technology maturity to serve as grid's load following. However, previous research mainly focuses on system analysis and core component optimal, and the performance of A‐CAES when constructing with renewable resources has not been fully addressed. In this paper, a comprehensive evaluation on A‐CAES is presented based on an annual photovoltaic (PV) output in western China. The A‐CAES is modeled from the systematic perspective and the PV output is classified into four types (sunny, mostly‐sunny, mostly‐cloudy, and cloudy). First, the performance with different weather and different rated power of A‐CAES is fully investigated. Then, performance availability with different rated power has been proposed—the optimal condition occurs with average 5.936 MWh/day capacity and 53.49% efficiency on 1800 kW rated power. The evaluation framework is suitable for evaluating the role of CAES with other sources and such result provides a reference for A‐CAES designing and further application. [ABSTRACT FROM AUTHOR]

Research on decommissioned batteries emphasizes the value of lost energy in batteries. This article analyzes the leftover battery capacity after its decommissioning from electric vehicles. This analysis includes the discreteness of the battery capacity, sorting based on a QC/T‐standard and alteration among the battery capacities. The potential of decommissioned batteries in other applications is presented, and a roadmap for the circular economy is suggested. Based on the data collected in China, significant faults occurring inside electric vehicles' battery packs are reviewed. An alternative inverter is tested to solve the significant challenges in using decommissioned batteries. Advancements are made toward a new intuitive cell balancing technique to utilize maximum capacity in each cell. [ABSTRACT FROM AUTHOR]