Buildings that produce their own energy and respond to our everyday needs; simple management tools that improve the comfort of our homes making them more economical and connecting them to the world; safer, smarter and more sustainable towns and cities that provide greater mobility, improve communication and make life easier for everyone. These are just a few examples of the energy transformation that is underway. The energy world has entered a new chapter in its history, a digital age that will impact our lives as much as the advent of electricity did at the end of the 19th century, bringing with it a groundbreaking wave of innovations that blur the lines between the energy and the digital space. Across the urban and built environment, new technologies are already advancing the convergence of different economic models with the energy system and infrastructure. This will fundamentally change the energy landscape and give each one of us access to tailor-made energy solutions adapted to our needs and means. This book Energy 3.0 discusses how these changes will continue to evolve and stimulate growth. It also investi- gates the new tools and services that will be made available to everyone and how the entire energy sector, as we know it, is going to reinvent itself, spurring job creation and the emergence of new energy professions.