Dominic and Cymene take a trip down MTV memory lane to the romantic 1990s on this week's podcast. Then (16:00) we welcome the brilliant Christine Folch from Duke U to the pod to talk about her brand new book, Hydropolitics: The Itaipú Dam, Sovereignty, and the Engineering of Modern South America (Princeton U Press, 2019 - https://press.princeton.edu/titles/30066.html). We start with the dam itself; Itaipú is both the largest dam in the world and the world's largest power plant. Christine explains how it came to be that South America is the lone continent where renewable energy is the dominant source of electricity and what the political consequences of hydropower have been. We talk through how different energy materialities influence politics and economies, the differences between modes of sovereignty defined by land, water and electricity, and frequency patriotism. We turn from there to the politics of debt and hydrodollars, the necessity of studying up, and what fieldwork among technocrats and engineers is like. We close on what the world might learn from the Brazil-Paraguay partnership in renewable energy generation as it contemplates even larger scale coordinations of decarbonized energy.