Energy network companies play a vital role in energy transitions. The transformational ability of these companies influences the process of energy transitions and the effectiveness of policies in this domain. This study shows the need for managers of network companies as well as scholars and policy makers operating in the midst of energy transitions to acknowledge the importance and value of boundary spanners in improving the transformation ability of these companies to play their role in facilitating energy transitions. Evidence comes from an in-depth analysis of an energy network company in the Netherlands. Our findings show that the transformation ability of energy network companies depends on various instances of boundary spanning as these organizations address differing or conflicting intra- and inter-organizational institutional logics when contributing to an energy transition. In the context of energy transitions, inter-organizational boundary spanning generally demands more resources and attention than the spanning of intra-organizational boundaries. Additionally, intra-organizational boundaries affect inter-organizational relationships, particularly in the policy arena. Our findings indicate that to carry out the type of institutional change that an energy transition requires, more attention and resources should be dedicated to intra-organizational boundary spanning, even as the need to connect external stakeholders increases.