Harvest Alaska Harvest Alaska completed its acquisition of BP Pipeline's midstream ownership, following approval by the Regulatory Commission of Alaska. Harvest immediately acquires BP's approximately 49 percent interest in the Trans-Alaska Pipeline System and 49 percent of Alyeska Service's and other Alaska midstream interests. Alyeska will continue to operate the pipeline as it has for decades. The 800-mile-pipeline system, one of the largest pipelines in the world, transports oil from the North Slope of Alaska to the northern most ice-free port in Valdez. Harvest Alaska, a subsidiary of Harvest Midstream, is a privately held midstream services provider based in Anchorage.