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This paper presents a technology roadmap developed for energy efficiency at Bonneville Power Administration (BPA). The paper presents 8 technology roadmaps for energy efficiency: heat pump water heaters, heat pumps w/o resistance, evaporative cooling, LED lighting, industrial process improvement, integrated building design (passive strategies), smart appliances, demand response. The paper also describes how the technologies and roadmaps were put together
Hoffman et al. (Sat,) studied this question.