The 4,200–gt coal-fired Badger (built 1953) has been cleared to remain operational in a deal with US environmental authorities.
Operator Lake Michigan Carferry had asked for a new permit after its previous licence expired at the end of 2012. Badger is the last coal-powered vessel on the Lakes.
It will have to install an ash-retention system by the beginning of its 2015 sailing season, however.
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