About Us Crimson Renewable Energy is California’s largest producer of high-quality, ultra-low carbon biodiesel and a leading participant in the future of advanced biofuels and transportation fuels. We provide highly reliable delivery and superior customer service combined with flexible contract structures for duration and pricing. Crimson also provides the flexibility and financial dependability that is highly valued by its supply chain partners. What We Do Crimson Renewable Energy operates the largest biodiesel production facility in California and distributes biodiesel to the wholesale market in the Western United States. In California, we currently offer bulk biodiesel fuel statewide to the wholesale market We are continuously engaged in forming partnerships with fuel wholesalers, refiners, terminals and other participants in the value chain for biofuels.