This chapter considers the capital energy requirements of buildings. It provides an outline for the various applications of Energy Analysis available to building designers. The integrating of capital energy cost analysis into current design practices and procedures is also discussed. The chapter outlines the methods and conventions for calculating embodied energy. The embodied energy of a product is the sum total of all the energy incorporated or invested, throughout the various stages of manufacture, from raw material to finished product. Energy Analysis is a "formalized" method for calculating the overall amount of energy required to produce goods and services. In energy analysis it is often only possible to calculate the process energy requirement of a product. In such cases it is necessary to draw a boundary between energy supply and demand. The chapter ends with a brief outline of possible design applications and opportunities for the use of energy analysis.