The article analyzes whether and to what extent regional related and unrelated variety matter for the development of green technology, and whether their influence differs over the technology life cycle. Using patent and socioeconomic data on a thirty-year (1980–2009) panel of US states, we find that unrelated variety is a positive predictor of green innovative activities. When unpacked over the life cycle, unrelated variety is the main driver of green technology development in the early stages, while related variety becomes more prominent as the technology enters into maturity.

This paper argues that e-skills – capabilities associated with the use and development of digital technologies – enhance regions’ ability to draw on existing know-how and create new industrial paths. The empirical analysis focuses on the relationship between e-skills and technological diversification for a panel of European regions in the period 2000–12. It constructs novel indices of regional e-skill endowment distinguishing between basic users, professional users and expert developers of information and communication technologies. The econometric results show that e-skills foster technological diversification dynamics in European regions, and that this effect is particularly strong for less-developed regions, and for low levels of relatedness.