Consider the source. The ADN is a San Francisco based paper that doesn't have the first clue about Alaska.
First, Usibelli coal mine is not located in Sutton, but rather 115 miles south of Fairbanks, right next door to Denali National Park, and has been in operation since 1943 supplying six coal power plants in Alaska, plus shipping coal to South Korea, China, Chile, and other Pacific Rim nations.
Second, the coal mine located in Sutton, Alaska, is called the Eska coal mine and has been in operation since 1968.
The only problem either of those coal companies had with permitting was under the anti-American communist Obama who wanted to illegally abolish all coal everywhere.
There use to be as many as 17 coal mines in the Matanuska-Susitna Valley. Alaska will continue to use coal power plants and furnish households with coal for heating because it is a cheap and abundant resource, and in some cases for a given area the only resource.
If your only choice was to use coal to stay warm through an Alaskan Winter no doubt you would choose to freeze to death.
States do not have the right, or the authority, to regulate commerce between States. Only Congress has that authority.
Apparently in WY's case they do have a customer in NY that wants their coal, and NY is trying to tell WY that they cannot sell their product in their State, and they cannot do that constitutionally. Not without approval from Congress.