TY CONF TI COMPARISON OF THE EFFICIENCY OF MAIN NON-TRADITIONAL AND RENEWABLE ENERGY SOURCES KW renewable energy sources KW solar energy KW wind energy KW hydropower KW geothermal energy KW bioenergy KW efficiency coefficient KW environmental safety JO INDUSTRIAL THERMAL POWER ENGINEERING AU Storodubtseva, T.N. AU Muzhdaba, Z.M. AU Chernikov, E.A. PY 2026 PB FSBE Institution of Higher Education Voronezh State University of Forestry and Technologies named after G.F. Morozov