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Danbury firm exploring new bio-residual oil to lower energy costs, environmental...

Preferred Utilities Manufacturing Corp. is testing bio-residual oil (BRO) -- produced from vegetable grease and animal fat -- by using it to power its entire 50,000-square-foot plant this winter.

Danbury’s Preferred Utilities Manufacturing sees bright future in liquid wood fuel

The alternative fuel is 81 percent more carbon-efficient than natural gas, and 88 percent more carbon-efficient than petroleum.