A strong (but largely invisible) nexus has always existed in the West between the water and energy sectors, as water is a major input in most forms of energy development, and large quantities of energy are required for water management and use—especially for pumping, treating, and heating water. These connections are becoming more salient given concerns of climate change mitigation and adaptation, the reform of energy systems, and the projected growth in water and energy demands. Our work in this area is focusing more attention on this nexus in the hopes of promoting more integration between water and energy planning, and to highlight the potential for cross-sector benefits of demand management. (See: Kenney, Douglas S. and Robert Wilkinson. 2011. The Water-Energy Nexus in the Western United States. Edward Elgar Publishing.)