Badger cleaned up

A veteran coal-powered US ferry has gone greener with new combustion controls.

The 4,200-gt Badger (built 1953) will set sail again on Lake Michigan on 16 May and should burn less fuel and produce less ash.

The upgrade has been carried out at a cost of more than $1m, Ludington Daily News reports.

Operator Lake Michigan Carferry has been under pressure to cut waste from the ship.

The Environmental Protection Agency requires it to reduce discharges this season and end them before the 2015 season begins.

The owner estimates the work will knock 10% to 15% from its ash output.

The new digital system changes the mix of air to reflect newer thinking on how coal burns best.

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