Illinois basin coal either costs less or has a higher heat content, so it’s the most popular under tougher EPA rules. Its share of U.S. production will climb
to 20 percent by 2040 from 13 percent currently. Illinois has the second-biggest reserves in the U.S., with 104 billion tons of coal, enough to power the country for 163 years at 2014 consumption levels. via Dirtiest
U.S. Coal Becoming Most Popular on EPA Rules – Bloomberg.