ISO 17742:2015为国家、地区和城市的地理实体提供了基于指标和基于测量的方法的能效和节能计算通用方法。 ISO 17742:2015考虑了所有最终用途部门，如家庭、工业、第三产业（服务业等）、农业和交通。它不包括发电厂、炼油厂和煤矿等能源供应部门的能效和节能计算。

ISO 17742:2015 provides a general approach for energy efficiency and energy savings calculations with indicator-based and measure-based methods for the geographical entities countries, regions, and cities. ISO 17742:2015 considers all end-use sectors, such as households, industry, tertiary (services, etc.), agriculture, and transport. It does not incorporate calculation of energy efficiency and energy savings in energy supply sectors, such as power plants, refineries, and coal mines.