一个月电费150万元的企业,投资300万元进行节电改造,假如节电效果达到20%,每月节约电费30万元,10个月可收回投资成本。之后,每月的30万元则为企业净收入,收益期达15-20年。节电企业通常会跟企业用户算这样一笔账。高额的回报对企业具有相当的吸引,加之当前全民节约的大环境,似乎不能不投资。然而,企业不禁要问,谁来保证“节电效果达到20%”? One month electricity 1500000 yuan of enterprises, invest 3000000 yuan for energy-saving transformation, if the energy-saving effect of 20%, 300000 yuan per month to save electricity, 10 months to recover the investment cost. After that, the monthly 300,000 yuan is the net income of the company, with a yield of 15-20 years. Power-saving enterprises are usually calculated with business users such an account. High returns on the enterprise has considerable appeal, combined with the current environment for universal saving, it seems unable to not invest. However, companies can not help but ask, who will guarantee that “saving 20%”?