Alliant Energy is shutting down one of its largest coal-fired generators as part of its plan to cut carbon dioxide emissions by 80 percent by the year 2050. The facility in Sheboygan was taken offline last week. Alliant expects to have its 700-million dollar combined-cycle plant operating near Beloit by 2020. The company says its West Riverside Energy Center will burn natural gas to turn turbines, using the heat to create steam which will power a huge generator. There will also be an adjoining 10-million dollar solar farm at the location.