INCREDIBLE as it seems in the resource-rich U.S., this summer's discomfiting electric-power cutbacks are likely to be only a prelude to many more pervasive difficulties. Part of the industrial U.S. is running short of the main sources of energycoal, fuel oil and natural gas. Some forms of rationing have already been imposed, and more may be necessary if winter brings severe weather, strikes in crucial spots, pipeline breaks or new trouble in the Middle East. Though few, if any residential consumers may be asked to curtail their use of fuel or power, there...
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