This editorial introduces the sixth volume of the International Journal of Sustainable Energy Planning and Management. Topics include methodology for assessing solar power and solar heat potentials using geographical information systems using Swiss cases, a similar analysis focusing on solar power in Kenya and the spatio-temporal distribution of the production, and the establishment of the correct economic framework conditions or incentives to promote changes towards renewable energy systems taking a Danish community as a case. Lastly, an article investigates the Chinese district heating sector with a view to identifying alternatives to the present coal-based heating infrastructure.