Techno-economic comparison of diabatic CAES with artificial air reservoir and battery energy storage systems

In the present paper, D-CAES storage systems are compared with Sodium-Sulfur (Na-S) and Lithium-ion (Li-ion) based ones on the basis of the Levelized Cost of Storage (LCOS). Utility-scale systems characterized by a rated power in the range of 5-20 MW and storage capacity of tens/hundreds megawatt-hours have been addressed. Analyses have been carried out by varying key parameters such as the installed power, the charge/discharge time periods, the price of electricity and the fuel cost. Results show that the adoption of D-CAES systems can lead to a better economic performance in respect to BES technologies. Na-S battery based systems show a better economic performance in comparison with Li-ion based ones. It has been noticed how D-CAES economic performance improves by increasing the size of the system both in terms of installed power and storage capacity. D-CAES solutions can achieve a LCOS lower than that shown by Na-S batteries, provided that the size of the system and the price of electricity are large enough. (c) 2022 The Author(s). Published by Elsevier Ltd. This is an open access article under theCCBYlicense (http://creativecommons.org/licenses/by/4.0/). Peer-reviewunder responsibility of the scientific committee of the 8th International Conference on Energy and Environment Research, ICEER, 2021.