How does institutional complexity affect effectiveness? This chapter addresses this question for the three policy fields studied in this book: renewable energy, fossil fuel subsidy reform, and carbon markets. The chapter takes a comprehensive perspective across the three case studies by examining three dimensions of effectiveness: output (generating regulations and intrastructure), outcome (changing behaviour), and impact (solving the problem). The study relies on a two-track approach, integrating assessments by researchers and interviews with key stakeholders. The results show how the considerable institutional complexity in the climate-energy nexus has consequences for effectiveness. Notwithstanding the methodical challenges for evaluating effectiveness under conditions of institutional complexity, these insights demonstrate that such an assessment is of high importance and should be continued for other contexts of global governance. In particular, the findings of this chapter help to identify suitable management options – i.e. options for formally regulating the linkage between institutions – for the climate-energy nexus. With these suggestions and its conceptual and empirical novelty, the chapter contributes to a variety of literatures – on climate and energy governance, on institutional complexity, and on effectiveness – while being of interest to different stakeholders operating in the climate-energy nexus.

The concluding chapter first summarizes some of the volume’s main results along the four evaluative themes. In terms of coherence and management, the three policy fields under scrutiny – renewable energy, fossil fuel subsidy reform, and carbon pricing – are roughly marked by coordination, rather than competition or outright harmony. Regarding legitimacy, the specializations and work backgrounds of stakeholders lead to considerable variations in their perceptions of institutions. For effectiveness, institutional complexity plays both a supportive and a hindering role across all three cases. Following the summary, a series of policy recommendations is developed, including: improving awareness of each other’s activities to avoid duplication of efforts and conflicting messages; aligning interpretations of central concepts, i.e. what constitutes renewable sources of energy, fossil fuel subsidies and carbon pricing; building stronger connections to counterparts in other areas of the climate-energy nexus and beyond; and entrusting one institution with an orchestrator role. Finally, the chapter suggests a future research agenda on the governance of the climate-energy nexus, e.g. to learn more about the causes of institutional complexity, to identify conditions for successful management efforts, and to examine further subfields and even other domains outside the climate-energy nexus.

This chapter establishes four evaluative themes that will be employed across this volume to analyze the institutional complexity of policy fields in the climate-energy nexus: coherence, management, legitimacy, and effectiveness. Coherence among institutions is conceptualized along four dimensions: convergence on an overarching core norm for the policy field, balanced coverage and distribution of memberships (private, public, hybrid), balanced coverage and distribution of governance functions (standards and commitments, operational activities, information and networking, financing), and mechanisms underlying cross-institutional relations (cognitive, normative, behavioural). Management will be examined according to types of managing agents, political levels (from domestic to global), and the consequences of management efforts in enhancing coherence. Legitimacy will be assessed along nine dimensions, among them expertise, transparency, accountability, or procedural and distributive fairness. Effectiveness, finally, will be examined in terms of normative and legal output produced by the institutions, their behaviour-changing outcome, and their ultimate problem-solving impact. Altogether, the four themes and their dimensions make up a novel framework for an in-depth analysis of a governance nexus. They help us examine a variety of important questions in a comparative research design, combining a high level of ambition with feasibility and novelty.

In recent years there has been a proliferation of international institutions that address climate change and energy governance, not least in the field of renewable energy. Given scarce resources, policy-makers need to prioritize which institutions to engage with. Central to this choice are considerations of the institutions’ legitimacy. The aim of this chapter is to understand how the legitimacy of international institutions is perceived under conditions of institutional complexity – i.e. in a context, where multiple actors work on the same issue area without overarching coordination. A questionnaire-based study examines common understandings of what makes an institution legitimate and how these understandings diverge amongst policy-makers and key stakeholder groups from different countries. Theoretically, the chapter unpacks the meaning of legitimacy under institutional complexity. Empirically, based on mixed methods, the chapter offers an assessment of legitimacy of a set of climate and energy governance institutions with different but overlapping mandates (the Clean Energy Ministerial, International Energy Agency, International Renewable Energy Agency, Renewable Energy Policy Network for the 21st Century, and United Nations Framework Convention on Climate Change). This chapter thus provides societally-relevant insights to the literature on legitimacy, with implications for how to strengthen climate and energy governance.

The introduction first explains the rationale and theoretical and empirical contributions of the edited volume. The book seeks to address a considerable gap in knowledge of the nature of the relationship between institutions governing the climate-energy nexus in a multilevel context. In particular, there is scant research on consequences on the legitimacy and effectiveness of governance arrangements and the climate-energy nexus as a whole. For an in-depth analysis of institutional complexity in the nexus, we selected three policy fields as case studies: renewable energy, fossil fuel subsidy reform, and carbon pricing. We made this choice since the three cases represent urgent and major components of the climate-energy nexus, since they vary considerably in the number and mix of institutions that govern them at the international level, and since they differ in their positioning within the climate-energy nexus – with carbon pricing primarily a climate change issue, renewable energy lying at the core of energy governance, and fossil fuel subsidy reform falling in between. The chapter concludes with an outline of the ccontributions to the book, structured along the volume’s three parts on mapping (I) coherence and management (II), and legitimacy and effectiveness (III).