Europe’s transition to a climate-neutral continent within 2050 will demand the commitment of all stakeholders, who are asked to pool their resources and expertise to take full advantage of the opportunities offered by low-carbon economy. In addition, over than climate change, transition can incite economic development and energy independence, critical to our security as we have clearly realized. Essential to this approach is turning all citizens from consumers to citizen producers and consumers (prosumers). At the same time it is necessary to shape properly a kind of business able to meet and face the challenge of renewable energy production, as well as energy efficiency. Energy Communities (ECs) are emerging as a favored model of cooperation among citizens, civil society, social entrepreneurs, public authorities and community organizations. Enabling them to access to clean energy, at the same time they create job’s placements, increasing skills, developing local economy, reducing energy poverty and strengthening community cohesion. “Energy collective” models will be a key tool in the fight against climate change and should be driven from the bottom up. However, national, regional, local authorities and private entities can support the birth of Energy Collective by providing the right framework. Communities can facilitate funding, expertise and advice, ensuring that regulatory issues can be easily understood and managed. GREEN faces the underlying issues related to models of energy collectives in the program area and provides good practices and guidance on the topic drawn from the capitalization of Project ADRIA_ALLIANCE (ITALME 397).