Natural gas prices are volatile at this point. Seems they have increased in recent months: http://www.smartplanet.com/blog/bulletin/coals-us-comeback/20453?tag

Natural gas prices are volatile at this point. Seems they have increased in recent months: http://www.smartplanet.com/blog/bulletin/coals-us-comeback/20453?tag=search-river http://www.smartplanet.com/blog/bulletin/coals-us-comeback/2...