As part of the modernization of the MAST Upgrade thermonuclear facility, engineers have installed a major 12-ton component called a 'double beam box'. This equipment is designed to significantly increase the plasma heating power—a key parameter for conducting experiments in controlled thermonuclear fusion. Thanks to the new module, the power of the plasma heating system at the facility will double, opening up opportunities for scientists to investigate conditions approaching those required for the operation of future thermonuclear power plants. Thermonuclear fusion is considered a promising energy source capable of providing humanity with nearly inexhaustible and environmentally clean fuel, since it is based on a reaction analogous to processes occurring on the Sun. MAT Upgrade is an experimental facility using spherical tokamak technology, which is considered one of the promising paths toward creating compact and efficient thermonuclear reactors. The project is part of broad efforts by the scientific community to develop technologies that will eventually enable industrial energy production through thermonuclear fusion. The installation of the new heavy equipment is an important step in developing an experimental base that allows researchers to model and study plasma processes under conditions closely approximating the real parameters of future energy reactors. Results obtained from MAST Upgrade are expected to make a significant contribution to the development of the next generation of thermonuclear facilities, including projects of international scale.