TY - SER AU - Hassenmuller, Harald TI - Power in numbers KW - POWER GRIDS KW - VIRTUAL POWER PLANTS N1 - Smal, distributed power plants, fluctuating energy sources such as wind and sunlight, and the deregulation of electric power markets have one thing in common. They increase the need for reliable and economical operation of electric power grids. The virtual power plant is an intelligent solution from Siemens. It networks multiple small power stations to form a large, smart power grid ER -