I found the following useful looking data at this website
http://www.worldcoal.org/pages/content/index.a sp?PageID=190
I copied the source reference in case anyone else wanted a look.
A 600 MWe coal-fired power station operating at 38% efficiency and 75% overall availability will consume approximately:
- Bituminous coal (CV 6000 kcal/kg NAR*): 1.5 Mt/annum
- Brown coal (CV 2250 kcal/kg NAR*): 4.0 Mt/annum
So using bituminous coal (which is very nearly all carbon, not impure), a 600MW PS uses 2.0Million tonnes if it worked flat out all year, or 228 tonnes per hour. This is equivalent to 0.38kg of Carbon per kWh.
The bit I can't do is the addition bit for the molecular weight of CO2 versus pure carbon - A level Chemistry is too rusty!
I think the multiplier is 3.7, so 1.40 kg of CO2 per kWh.
Any other offers?