Determination of the Best Modes of the Electric Power System Containing Thermal and Hydro Power Plants Using the Method of Stepped OptimizationAleksandr M. Kler, Pavel V. Zharkov, Nikolai O. Epishkin, Elena L. Stepanova and Dmitriy N. KaramovE3S Web Conf., 470 (2023) 01007DOI: https://doi.org/10.1051/e3sconf/202347001007