In response to the first oil crisis in 1973, the first regional energy agencies were created to support regions and municipalities in managing their energy supply and demand. Since then, EU’s Regions, Islands and their local/regional Energy Agencies have become effective delivery agents of the energy transition in their territories. Facing the urgency of climate mitigation and energy security crisis, their solutions can fuel the necessary acceleration of Europe’s energy transformation. Below we showcase their ready-to-upscale and ready-to-replicate projects from across Europe.