Wind power and combined heat and power (CHP) using biomass (for combustion, gasification or fermentation) are two of the most promising renewable technologies for generation of electricity. Denmark has a long and well-established tradition for these technologies that now account for approx. 25% of its annual electricity production. In this paper, we present and discuss the Danish experience as a case of promoting renewable energy technologies. The development path of the two technologies has been very different. Wind power is considered an outright success with fast deployment to decreasing costs and the Danish producers now dominating the global market in a fast expanding industry. Contrary to that the development and implementation of biomass CHP has encountered a number of difficulties. The different experience of the two technologies is discussed from the perspective of innovation theory. To this purpose we have developed an analytical scheme that fits very well the case of wind power, whereas the development of biomass appears to have followed a different path. Our analytical scheme can be utilized for policy recommendations. Even though support systems must be adapted to each technology and its particular context, it is possible to formulate some general principles that can help to create an effective and efficient policy for promoting new renewable energy technologies.