As climate change worsens, it will increasingly impact the water-energy nexus (water power for electricity, water to cool fossil energy generation, energy for irrigation...). This One Earth Research Article uses climate analog cities, i.e. cities that are currently experiencing the climatic conditions expected in the future for a given city, to explore how future water/energy demands might change. The results are relevant for planning climate adaption (SDG 13) for more sustainable cities (SDG 11).