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Ammonia as an energy storage medium is a promising set of technologies for peak shaving due to its carbon-free nature and mature mass production and distribution technologies. In this paper, ammonia energy storage (AES) systems are reviewed and compared with several other energy storage techniques. It is shown that once optimized for commercial use, AES systems have the potential for cost-effectiveness and efficiency. Its independence of topographic or climatic resource availability makes it an ideal option for many locales that has no provisions for pumped-hydro storage or with too harsh a climate for electrochemical batteries to survive. The range of applications for AES systems covers common utility-scale storage and includes electric vehicles applications. In this review, the viability of ammonia as a hydrogen carrier is discussed in detail, especially as a thermochemical energy storage media, and as a …