This report is based on the main result of articles and papers written during the EUDP founded project: Demand as Frequency-controlled Reserve (DFR or DFCR). The project was started in April 2008, and was ended by December 2012. During the project period, many exciting challenges have been met with great enthusiasm from all DFR project members who have shown a memorable dedication to their work. Active control of electricity demand is a key technology when creating a more dynamic, wind power friendly energy system. In this demonstration project, we have developed and tested devices, which use electric loads to provide frequency controlled primary reserves. The devices collected data from domestic households and industrial loads covering i.e. circulation pumps, electrical domestic heating, bottle coolers, a wastewater treatment plant etc., that have been analysed and used for the papers and articles included in this report.