X. ENERGY STORAGE TECHNOLOGY Energy storage has been receiving increasing attention in recent years because of the prospect it offers for substantial cost savings and for significant conservation of critical energy resources. Furthermore, the emergence of new concepts promises to broaden its applicability and increase its usefulness over the current state-of-the-art. Energy storage is pertinent to a survey of satellite power systems for basically two reasons. First, the constant energy supplied by the satellite must be distributed to a varying load. To satisfy peak loads this implies either that some energy must be wasted or stored and storage would seem to be, on the surface at least, preferable. The second reason that storage is pertinent to satellite power systems is that the application of advanced energy storage concepts to terrestrial power systems may so improve their competitiveness as to render satellite power uneconomic. This brief survey answers neither of these questions. It does provide some background and related information. Documents reviewed in preparation of this section are fully cited in Section K of the list of references. The survey is presented in the context of ERDA's energy storage research and development program as reported in Reference KI and updated by Reference K2. Pertinent information from EPRI (Electric Power Research Institute) and JPL is also included. There are generally seven methods of energy storage. These are: • Batteries • Hydrogen • Flywheels • Conpressed Air • Pumped Hydro • Magnetic Energy • Thermal Storage Exhibits 60 through 63 summarize some of the more pertinent characteristics and parameters of the six non-thermal storage methods. Exhibit 64 summarizes thermal storage using various storage media. These exhibits
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