satellite if continuous output of the rectenna is required and the long distance to the consumer. The latter two problems are eliminated if energy storage on the ground is employed. Probably the most practical storage method would be to use the electrolysis of water to produce hydrogen for shipment to consumer centres. The hydrogen could then be reconverted to electricity via fuel cells or used directly as a non-polluting fuel, even in motor vehicles [1], Shipment would probably be comparable to the current and already extensive shipment of liquified natural gas. Alternatively, energy transmission systems such as superconduction transmission lines could also be explored. Certain high-latitude cities may already be suitable for direct connection to the rectenna. We believe the practical advantages of the PSPS make it worthy of further study. REFERENCES [1] Winsche, W.E., Hoffman, K.C. & Salzano, F.J. (1973) Hydrogen, its future role in the nation's energy economy, Science, 180, p. 1325.
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