Study of change in 300 MW power unit efficiency operation under reduced loads Aleksey Malykov, Aleksey Babushkin, Kirill Naginaev, Ludmila Kinash and Artem Kalashnikov MATEC Web Conf., 329 (2020) 03080 Published online: 26 November 2020 DOI: 10.1051/matecconf/202032903080