TC Energy Corp. is planning to restart one leg of the shuttered Keystone oil pipeline beginning Saturday, following a 14,000-barrel crude spill, according to people familiar with the matter.The company, which declared force majeure on shipments Thursday, expects to restart flows Dec. 10 on the segment of the line extending to Patoka, Ill., said the people, who asked not to be identified discussing confidential matters. The leg of the pipeline that extends to the Cushing, Okla., storage hub is expected to restart Dec. 20, they said.