Americans use a lot of energy in homes, in businesses, and in industry, and to travel and transport goods. There are four end-use sectors that purchase or produce energy for their own consumption and not for resale:
These end-use sectors consume primary energy and also purchase and use most of the electricity (a secondary energy source) the electric power sector produces and sells. The electric power sector consumes primary energy to generate electricity for sale to the other four sectors and for export to Canada and Mexico. The end-use sectors also produce some electricity for their own use, which in the industrial and commercial sectors is called direct use.
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原文:https://www.cnblogs.com/dulun/p/14780663.html