This concluding synthesis argues that practices of legitimation can empirically deconstruct any given energy transitions case to identify mechanisms that constrain or enable accountability to decarbonisation with social equity enhancement. The versatile analytical application of these practices can advance environmental governance research on steering energy transitions towards sustainability. This chapter explicates seven cross-cutting dimensions and indicates how practices of legitimation play out within them in five cases related to energy transitions, drawing on contextualised examples from two cases for each dimension. This illustrates how practices of legitimation (discursive, bureaucratic, technocratic and financial) can reframe wide-ranging cases from diverse perspectives, fields and disciplines. Applied researchers can choose customised dimensions and enlarge this indicative set to identify situated mechanisms that modulate accountable energy transitions.