This contribution deals with an idea of smart grids, a physical realization of a DC smart grid laboratory model (E.E.N.) and a strategy of its control. An author’s idea is to utilize a maximum of renewable energy which is available in an every moment. It would be a logical and the most economical principle, but it is in a contradiction with physical principles of electrical energy, with requirements coming from consumers and with possibilities of an electrical distribution system and information and control systems. A saving electrical energy is a difficult problem. In the contribution authors specify most of existing possibilities of the electrical energy saving. In a chapter DC laboratory smart grid authors describe and design a physical realization of the DC smart grid with saving into different technologies. And one of these ways is hydrogen.