The high energy consumption in the building sector, that is primarily fossil-fuel based, and the limited availability of the national electric grid in some remote or rural areas of the Mediterranean region call for new solutions that ensure stability and power quality of energy provision and higher penetration of renewable energy sources. In this context, BERLIN aims to implement cross-border pilot measures to support innovative and cost-effective energy rehabilitations in public buildings based on the nano-grid concept, the building block for smart micro-grids. The project will focus on increasing grid penetration, combined with energy storage and demand-side management, along with enhancement of energy efficiency in buildings. The goal is to reach high levels of self-resilience in public buildings and to make them greener, smarter, more innovative and sustainable. The project will implement 8 energy rehabilitation pilot actions which bring effectively together photovoltaic, energy storage, smart grid elements, home automation, etc. to achieve a self-sufficient nano-grid.