The deal aligns with the energy company’s aim to grow its U.S. fuels and convenience retail business. HOUSTON—BP is taking full ownership of its Thorntons joint venture to increase its presence in the U.S. fuels and convenience retail industry, acquiring the majority share it does not already own in the Louisville, K.Y.-based convenience retailer from ArcLight Capital Partners LLC. BP said it plans to retain and build on the Thorntons brand. When the deal is complete, BP will expand its Midwest and Southern footprint with 208 owned and operated locations across six states, including Kentucky, Illinois, Indiana, Ohio, Tennessee and Florida.