How much cost per energy unit does gasification of coal add versus just burning the coal?

Question

What percent greater is the cost of energy from gasified coal versus coal just burnt in a furnace?

Answer 1

This paper estimates that coal electricity costs 3.7cents/kWh, and IGCC costs 4.2cents/kWh.

"The Economics of Generation Technologies: Present and Future"
by Yorgos Papatheodorou, Ph.D., as presented at PowerGen International
in Las Vegas, Nevada December 10, 2003