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Some people think that hydroelectric and solar power should be used to supply all of the electricity for US Which following would a flaw in this plan?

A flaw in the plan to use only hydroelectric and solar power to supply all of the electricity for the US is that these sources are intermittent. This means that they are not always available when needed, such as during periods of drought or at night. As a result, a reliable backup source of power would be needed in order to ensure a consistent supply of electricity.