Energy is arguably the main pillar of our civilization and urban lifestyle. It fuels progress, well being and growth. Since our societies have become aware about the massive scale of negative impacts resulting from our fossil fuel-based energy consumption, shifting to renewable and new sources became imperative to protect life on Earth. Examining power generation and consumption in light of the FWE nexus shows the urgent need for an integrated approach. Assessments of land use, energy and water are often carried out in isolation by disconnected institutions. An institution focusing on water resources, for example, is likely to consider food and energy systems as end users. Similarly, agricultural assessments might see energy and water as resources, and the energy sector is likely to treat biomass (waste) and water (rivers) as inputs. Thus, promoting renewable energy (allocated or not in urban areas) through the current sector-driven approach, disregarding indirect transboundary impacts on land and water resources and GHG emissions, could counteract the so-desired sustainable development of cities and the fight against climate change.