从我国面临科学发展和转变经济发展方式迫切需求出发，分析节能降耗的总体经济效益，以探讨实施积极的节能降耗目标的经济合理性。笔者对“十一五”期间节能降耗工作的总体经济效益进行了评估，用数据和事实肯定了“十一五”节能降耗的巨大经济效益；并分析了提高能效对我国“十二五”转变经济发展方式，支持长期可持续经济发展的宏观经济效果及其必要性和合理性。

The paper explored the urgent needs of scientific development practice and economic development pattern transform. The integrated economic effectiveness of energy conservation and intensity decrease were analyzed,and the economic rationality of energy conservation priority strategy was identified. The paper assessed the integrated economic benefit of energy conservation effort during the "11th Five-Year Plan"  period. With data and facts, it was approved that the energy conservation efforts achieved great economic benefit. The paper analyzed the macro-economic effectiveness contributed by efforts of energy conservation in the "12th Five-Year Plan"  period to support the transform of economic development pattern, and to achieve long term sustainability of economic growth.