As part of the ERDA National Thermal Energy Storage Program Sandia Laboratories has planned and is implementing a Thermochemical Energy Storage and Transport Program. The main objective of this Program is to develop, verify, and demonstrate the technology necessary to store and transport energy by reversible chemical reactions. In general, the program emphasis is currently on such fundamental problems as chemical kinetics and heat transfer characterization. Many fundamental questions must be addressed before the potential of thermochemical techniques can be accurately assessed. The paper reviews the use of thermochemical reactions for energy storage and transport and discusses the general Program structure, content, and thrust.