Valencia is Green Capital in 2024, a title which recognises the longstanding pioneer in sustainability. The city council does aim for a transformation that meets environmental criteria as much as social ones. Its outstanding support to energy communities and the special focus on the weakest residents, suffering from energy poverty, ill-health or other social disadvantageous, make Valencia a "fair transition" living lab. The experiences gathered in the city, both in winter and in summer, are shared with other local authorities within the Sun4 All Community of Practice.