In this work, the concept of a single marketplace for flexibility is introduced. Based on the requirements for TSO-DSO interaction, the concept of a single marketplace for flexibility has been assessed. This assessment does not provide a comparison with other ways to ensure a coordinated use of flexibility, but it shows the strengths and weaknesses of a single marketplace for flexibility.

The single marketplace is a lean and transparent concept to deal with the procurement of flexibility, which could theoretically lead to an economical optimum for the entire system, while respecting technical boundary conditions. On the other hand, the marketplace will not function properly without sufficient flexibility offers, there is no practical experience with this concept and the ICT requirements for its implementation are challenging.