United Airlines today further strengthened its emerging reputation as the world’s most environmentally-conscious airline by renewing its contract with Boston-based World Energy, agreeing to purchase up to 10 million gallons of cost-competitive, commercial-scale, sustainable aviation biofuel over the next two years. The biofuel, which United currently uses to help sustainably power every flight departing its Los Angeles hub, achieves a greater than 60% reduction in greenhouse gas emissions on a lifecycle basis.

United’s contract renewal follows the airline’s original purchase agreement in 2013. United is currently the only U.S. airline to use biofuel in its regular operations. World Energy’s biofuel is made from agricultural waste and has received sustainability certification from the Roundtable on Sustainable Biomaterials.

World Energy recently announced that it will invest US$350 million to fully convert its Paramount, California, facility to renewable diesel and sustainable aviation jet fuel, bringing its total capacity to more than 300 million gallons of production annually at that location, one of the company’s six low-carbon fuel manufacturing plants.

“Investing in sustainable aviation biofuel is one of the most effective measures a commercial airline can take to reduce its impact on the environment,” said Scott Kirby, United’s president. “As leaders in this space, United and World Energy are setting an example for the industry on how innovators can work together to bring our customers, colleagues and communities toward a more sustainable future.”

“Great companies lead,” said Gene Gebolys, World Energy’s chief executive officer. “We are honored to renew our commitment to United to advance their efforts to drive change to a lower carbon future.”

United’s contract renewal with World Energy will further assist the airline in achieving its recently announced commitment to reduce its greenhouse gas emissions by 50% by 2050. United’s pledge to reduce emissions by 50% relative to 2005 represents the equivalent of removing 4.5 million vehicles from the road, or the total number of cars in New York City and Los Angeles combined. United’s biofuel supply agreements represent more than 50% of the commercial aviation industry’s total agreements for sustainable aviation biofuel.