EXHIBIT 60. NON-THERMAL STORAGE SURVEY • AT OR CLOSE TO OPERATIONAL STATUS COMMENT • PUMPED HYDRO SEVERE SITE LIMITATION BUT UNDERGROUND RESERVOIR ALLEVIATES SOMEWHAT • COMPRESSED AIR REQUIRES UNDERGROUND RESERVOIR AND IS ALSO SENSITIVE TO TERRA IN • LEAD ACID BATTERIES NEEDS DEVELOPMENT TO INCREASE LIFETIME TO APPROXIMATELY 20 YEARS • LONGER DEVELOPMENT CYCLE REQUIRED •HYDROGEN ELECTROLYZERS AND FUEL CELLS NEED IMPROVEMENTS IN EFFICIENCY AND COST. METAL HYDRIDE STORAGE IN DEVELOPMENT BUT UNDERGROUND STORAGE IS POSSIBLE •REDOX AND Na-S BATTERIES STILL IN LABORATORY STAGE •FLYWHEEL NEW HIGH-STRENGTH MATERIALS AND SOPHISTICATED LOW-FRICTION BEARINGS NEEDED • IN INITIAL DEVELOPMENT STAGE • SUPERCONDUCTING MAGNET PROTOTYPE BEFORE 1985
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