This reference describes the methods used to forecast loads on public utility systems, featuring modern documentation and forecasting techniques for lead times of up to approximately 24 hours. Methods include automatic adaptive, univariate, and multivariate. The volume is divided into three parts: an introduction to the general economic and operational decision-making contexts and methods of short-term forecasting; six contributed insights into a wide range of model developments in load forecasting; and further insights into adjacent fields, including essays on the econometric perspective to load forecasting and the very short-term implications of state-estimation for data validation.