Yes it does, but far, far less. My previous recollection of more than 60% less is accurate.
Quote:Gas vs Coal
The CO2 emissions from Natural Gas Combined Cycle (NGCC) plants are reduced relative to those produced by burning coal given the same power output because of the higher heat content of natural gas, the lower carbon intensity of gas relative to coal, and the higher overall efficiency of the NGCC plant relative to a coal-fired plant (1).
“The average emissions rates in the United States from natural gas-fired generation are: 1135 lbs/MWh (Mega Watt hours) of carbon dioxide, 0.1 lbs/MWh of sulfur dioxide, and 1.7 lbs/MWh of nitrogen oxides. Compared to the average air emissions from coal-fired generation, natural gas produces half as much carbon dioxide, less than a third as much nitrogen oxides, and one percent as much sulphur oxides at the power plant.”(
http://www.global-greenhouse-warming.com/gas-vs-coal.htmlYou can see the basics at that site.
I think we should have transitioned to Natural Gas years ago, and I know they are building plants down near Warrnambool,(one at Orford, across the road from my friend's house, and one near Mortlake) as there are massive amounts of gas there.