The 2-degrees target of the Paris Agreement and Sustainable Development Goal 7 on energy are intrinsically intertwined and highlight the urgency of an effective and integrated approach on climate change and energy. However, there are over a hundred international and transnational institutions with different characteristics and priorities that aim to address climate and energy-related targets. While prior research has contributed useful insights into the complexity of climate and energy governance, respectively, an integrated and coherent analysis of the climate-energy nexus is lacking. This chapter therefore maps, visualizes, and analyzes this nexus, i.e. institutions that seek to govern climate change and energy simultaneously. In addition, the chapter zooms in on three specific subsets of institutions: renewable energy, fossil fuel subsidy reform, and carbon pricing. The mapping and analysis are based on a new dataset and provide first insights into the gaps, overlaps, and varying degrees of complexity of the climate-energy nexus and across its subfields. Moreover, the chapter serves as the empirical basis for further analyses of coherence, management, legitimacy, and effectiveness, and as the first step in creating a knowledge base to guide actors who seek to navigate the institutionally complex landscape of the climate-energy nexus.