A Canadian company that turns leftover wood from forestry operations into heating fuel has begun supplying Bates College in Lewiston and is seeking enough customers to build a production facility in Maine. Ensyn Corp. is ramping up production of a proprietary biofuel it has made for more than 25 years at a small facility in Renfrew, Ontario. Now the company, along with private partners and the governments of Canada and Quebec, is building a $78 million plant at Port-Cartier, Quebec.