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.

Developed countries face problems with an aging infrastructure. Across this landscape of change, it is crucial for policy-makers to understand the synergies between grids and information and communication technologies. Only smart and strong grids will connect people with reliable clean energy.

The case book Spotlight on Smart and Strong Power T&D Infrastructure highlights experiences of countries in different parts of the world, as they performed transmission and distribution projects on their electrical systems. The projects illustrate a wide range of applications, solutions, and technologies that were used to meet the challenges that various countries were facing. Many of the projects focused on the need to manage the integration of large amounts of renewable and often intermittent energy sources.

Additional projects will be added progressively in future editions of the case book.

The first edition of the case book was published in 2015. It includes eight cases, based on information collected during 2014 and 2015.

The second edition was published in 2016 and contains an aditional five cases. Case book summaries in Spanish and English are provided for the second edition .