".Natural gas liquids (NGLs) from the U.S. shale boom such as ethane, an alternative to naphtha refined from crude, could feed as much as a third of demand growth in 2017, BP's Richard de Caux told the Platts Refining Summit in Brussels..."

As I said in a response to another post, the market for Natural Gas and it's constituents have not been fully realized. The future is wide open and does not depend entirely upon the conversion of power plants from coal to Natural Gas.

http://www.reuters.com/article/us-oil-demand-refineries-idUSKCN1201EY