The station would have had an efficiency of 46 % equates to a reduction in carbon dioxide ( CO ) of 23 % per unit of electricity generated .
46 % in comparison to conventional subcritical coal - fired power stations .
The station would have had an efficiency of 46 % , which in comparison to conventional subcritical coal - fired power stations , equates to a reduction in carbon dioxide ( CO ) of 23 % per unit of electricity generated .