This document discusses using an "urban tissue" approach to visualize and analyze the energy demand and supply potential of urban areas. It presents the concept of exergy, or the quality of energy, and how unused energy sources within urban systems can be tapped. The research approach involves modeling the energy flows into, out of, and through a standard hectare of urban land to estimate demand and map potential supply sources like roads, waste, biomass, and heat exchange. A case study of Urban Parkstad in the Netherlands finds its energy supply potential from these sources can fulfill parts of the area's total demand. The urban tissue approach provides a quick way to scan urban functions, energy sinks, and sources.