Ames-based Renewable Energy Group Inc. plans to buy nearly all of the assets of Imperium Renewables Inc. The purchase will include a 100 million-gallon nameplate capacity biomass-based diesel refinery and deepwater port terminal at the Port of Grays Harbor, Wash. REG will pay Imperium $15 million in cash and issue 1.5 million shares of REG common stock in exchange for substantially all of Imperium’s assets. In addition, REG will pay either $1.75 million in cash or 175,000 shares of REG common stock at closing as elected by REG. Imperium will retain its net working capital value of approximately $25 million. REG will also assume $5.2 million of Imperium debt. Read more