Per https://www.secondwavemedia.com/lakeshore/features/Bidding-farewell-to-iconic-JHCampbell-power-plant.aspx : “…About $1 billion has been invested in air quality control systems at the J.H. Campbell Generating Complex, according to Consumers Energy…” Per https://www.wzzm13.com/article/news/local/lakeshore/what-will-happen-to-the-jh-campbell-plant/69-522203712 entitled “what will happen to the JH Campbell plant” : “Morgenstern says Consumers has already invested $1 billion to reduce emissions out of their stacks. ‘We’re removing mercury, we’re removing nitrogen oxide, sulfur dioxide, […]