The energy sector is in transition. Firstly, the liberalisation process forces companies to restructure their value chain in order to increase their market efficiency. Secondly, in order to reduce carbon emissions, the use of renewable energy sources is enforced by national and international regulations. Thirdly, smart metering is being widely adopted and with it consumers will be involved actively. The main goal of the project is to develop an ICT system that fits the future liberalised energy sector and enables the integration of a higher rate of distributed and renewable energy sources into the electricity grid. We will explore an approach for demand (and supply) side management in which electricity consumers and producers issue flex-offers indicating flexibilities in time and amount of the electricity. These flex-offers will be processed by our system in order to balance electricity supply and demand in near real-time and thus allow to use not-schedulable renewable energy sources much better.