有功输出 meaning in English

active output
useful output

3 . when the generator provides reactive and voltage service in power system , the active output is affected and so the company ' s revenue will be influenced . the opportunity cost and capacity cost of reactive power of generator are analyzed , and a method considering the total cost of opportunity and capacity as pricing of reactive power is presented in this paper
根据发电机作为无功电源时对有功输出及收入的影响，详细地分析了发电机无功出力的机会成本和容量成本，提出了以无功的机会成本加容量成本作为发电机无功计价的方法。