Considerable progress has been made with electrical heating in recent years. The higher cost of electrical energy as compared with the cost of solid or liquid fuels is compensated by the advantages of cleanliness, convenience and efficiency.The authors advocate the more extended use of electrical heating by adopting thermal storage, thus enabling energy to be used during off-peak hours. They contend that such a system is economical to operate, and they show that, for large buildings, electrical heating can compete with systems employing other forms of fuel.