Renewable energy and its application for electric energy production. Physics of superconductors (theoretical and practical aspect), production of low temperature, properties and production of superconducting components applied in practice in power engineering. Theory of direct energy conversion, types of direct energy converters applied in practice and the calculation of their electrical parameters. Principles, practical solutions and application of energy storing. Design and operation of the electrical systems of renewable energy, their connection into the power system. Economical aspects.