... following forms of energy are distinguished: me-chanical energy (i.e. potential or kinetic energy) , thermal, electric and chemical energy, nuclear energy and solar energy. In practical energy ... perform work becomes visible by force, heat and light. The ability to perform work from chemical energy, as well as nuclear and solar energy is only given if these forms of energy are transformed ... 1.1 Energy system 1 1.2 Applications of renewable energies 7 1.3 Structure and procedure 9 1.4 Conventional energy provision systems 14 2 Basics of Renewable Energy Supply 23 2.1 Energy...