A 19th century mill building in Pittsfield, N.H., is being converted to help produce a 21st century fuel.

American Energy Independence Co. is turning the former Suncook tannery into its headquarters and a site for converting restaurant waste vegetable oil into fuel.

Chief Executive Tony Giunta says AMENICO collects used vegetable oil from more than 150 restaurants, filters it and blends it to create a new fuel. He says the plant will be in business by Dec. 1.

The company also will sell products including vegetable oil multi-fuel boilers.

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