英语翻译Regulatory flexibility by the U.S.Environmental Protecti

英语翻译
Regulatory flexibility by the U.S.Environmental Protection Agency (EPA) (Washington,D.C.) has lowered the cost of mercury control by the North American Power Industry by about $1 billion over the last 12 months,according to Brock Ramey,Industrial Info's North American Power Manager.
求英语方面专家给出一个准确的翻译,我能读懂大致的意思,但是还是不够肯定,这条信息对我很重要,
如果能提供一下导致事件发生的原因，