The presentation was made at IEEE PES 2011 General Meeting Super Sessions in July, 2011. Key questions for power companies and others were raised and answered in the presentation as follows: 1) How much to keep existing coal units running? 2) What should be the Replacement? Detroit Edison (DTE) has already made tremendous progress in reducing emissions and its carbon dioxide emissions are roughly at 1990 levels. DTE’s GHG intensity has been steadily decreasing. It uses selective catalytic reduction (SCR) to reduce NOx emissions by 90 percent, installs in flue gas stream between economizer and air preheater, uses ammonia to convert NOx to nitrogen and water. Also, Flue Gas Desulfurization (FGD) – scrubber is also used as well to reduce SO2 emissions by up to 97 percent and install in flue gas stream immediately before new stack.