In efforts to mitigate climate change, energy systems are undergoing a profound transition towards low-carbon systems. This transition does not only involve changes in energy technologies but importantly it is shaped and incentivized by changes in the rules and regulations that govern energy markets. It is a normative transition, focused at achieving secure, affordable, and sustainable energy provision. In a multidisciplinary approach, this paper proposes a framework that highlights the role of normative principles - i.e. values - in socio-technical systems. Building on the Institutional Analysis and Development (IAD) framework, the analysis explicates how values relate to institutional change in the case of the energy transition.