Mr. Garrett Blaney:

A major jump in cost is associated with going from AC technology to DC technology. I am not sure there is that much of a differential between going underground and overground when DC technology is used. The main issue is going from AC to DC. Two very large converter stations are needed to convert a line from AC to DC. There are very few manufacturers in the world of the special cables that have to be used. The line then has to be reconverted back into AC. There are losses associated with that.