Voloshkina, O.S., Zhukova, O.H., Tkachenko, T.M. and Sviatohorov, I.O. 2023. Renewable energy sources for backup energy supply of small wastewater plants and individual households. Environmental safety and natural resources. 45, 1 (Mar. 2023), 5–16. DOI:https://doi.org/10.32347/2411-4049.2023.1.5-16.