Measuring and Comparing Energy Flexibilities.

Flexibility in energy supply and demand becomes more and more important with increasing Renewable Energy Sources (RES) production and the emergence of the Smart Grid. Socalled prosumers, i.e., entities that produce and/or consume energy, can oer their inherent exibilities through so-called demand response and thus help stabilize the energy markets. Thus, prosumer exibility becomes valuable and the ongoing Danish project TotalFlex [1] explores the use of prosumer exibility in the energy market using the concept of a ex-oer [2], which captures energy exibilities in time and/or amount explicitly. However, in order to manage and price the exibilities of ex-oers eectively, we must rst be able to measure these exibilities and compare them to each other. In this paper, we propose a number of possible exibility denitions for ex-oers. We consider exibility