The paper discusses the entry strategies adopted by research-based firms introducing advanced renewable energy technologies (RET) in the electricity production sector and their interactions with regime incumbents. Drawing on the sustainability transitions and the strategic management of technology literatures we build an analytical framework and apply it, in an exploratory way, to firms operating in two very diverse energy niches - wind and wave energy - using in depth-case studies. The results suggest that new entrants tend to depend on complementary assets possessed by incumbents, but have conditions to protect their technologies from expropriation; and that the technologies are relevant for (at least some) incumbents, which show interest on them, or are directly involved in their development/use. This is, in most cases, conducive to 'cooperation' strategies, which assume different forms according to the stage of development of the technology and its proximity to incumbents' competences and assets.

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Actor behaviour,Case studies,Commercialisation strategy,Complementary assets,Disruptive innovation,Entry strategies,Incumbents,New entrants,Niche regime interaction,Renewable energy technologies,Research-based firms,RET,Sustainability transitions

• Economia e Gestão - Ciências Sociais