The article presents the concept of an array of modular vertically oriented turbines that are installed under the water surface to harvest energy from water flows. Such modular technical decisions may be of more interest and total economic efficiency in some specific conditions rather than giant wind turbines with hundred-meter blades. Particularly module structure is more appropriate under war threats, natural catastrophic events caused by a climate changes, relocation of production due to economic and political reasons, etc. The geometric parameters of one device are justified, and, on their basis, an estimated calculation of the possible generated power is made. There are pointed out the paths for the development of the technology for production of the proposed modules, in particular, with using modern integrated printing systems (industrial 3D printers), instead of environmentally unfavorable composites (which are used to make turbine blades of modern wind energy stations). The issues of ensuring the static stability of one module, as well as the features of the electrical part of the entire system, are also considered.