Policy learning is together with technological, organisational and institutional learning an integrated part of the learning economy. It implies that policy-making itself is a process of learning and that this process more and more takes learning and competence building in many parts of the economy into account. The paper discusses opportunities and conditions for applying policy lessons learned from the Danish wind energy success case to other emerging renewable technology areas like solar cells. Although the empirical basis is the specific Danish context, lessons learned are relevant in a broader policy context as well.