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Energy efficiency investments occur in virtually every sector of the economy. When combined, their total number is substantial — estimates range from about $60 to $115 billion a year in the United States. In this post, we look at some recent estimates of energy efficiency spending, updating and expanding information we compiled earlier this year so that we may better understand the magnitude of these investments and where they occur. These findings provide a foundation for two subsequent posts we will publish in the next month on “Who invests in energy efficiency and why?” and “How can we increase energy efficiency investments?”