The Nordic Climate Cluster (NOCC) was an innovation network composed of large Norwegian and Swedish companies from different industries with common interests in climate-friendly eco-innovations. The network was initiated in 2008, but was disbanded just two years later. This study treats the NOCC as a special case (an eco-innovation network) and examines factors that influenced its failure. The study shows that the network failed for a variety of reasons, including a lack of stability, a lack of social capital and inadequate market demands for eco-innovations. The study concludes with implications for policy-makers who are keen to promote eco-innovation via networking.