Renewable Energy Group Inc. announced this week that it is has sold one billion gallons of advanced biofuels in its 17-year history. The Ames-based company, which became publicly traded in January 2012, has grown from producing 30,000 gallons in its first year to more than 258 million gallons sold last year through a nationwide distribution and logistics system. We have endeavored to provide customers with a reliable and durable product that helps diversify the energy complex and increases energy security, improves our environment, and supports agriculture," CEO Daniel Oh said.