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Energy efficiency is using less energy to provide the same level of energy service. Efficient energy use is achieved primarily by means of a more efficient technology or processes rather than by changes in individual behavior. The state of California began implementing energy-efficiency measures in the mid-1970s, including building code and appliance standards with strict efficiency requirements, with the enactment of Title 24, Part 6, of the California Code of Regulations (The Energy Efficiency Standards for Residential and Nonresidential Buildings).
The focus of this tool is energy efficiency as influenced by government and utility programs that encourage and enforce energy practices by commercial and residential uses.