The Canadian energy giant TransCanada said Thursday it’s prepared to move ahead with the long-awaited Keystone XL oil pipeline and plans to start construction next year, laying to rest rumors that it would abandon the project in the wake of regulatory setbacks in Nebraska. In a statement, the company said it’s beginning to work with Nebraska landowners to secure necessary easements to allow the pipeline to go forward. “Over the past 12 months, the Keystone XL project has achieved several milestones that move us significantly closer to constructing this critical energy infrastructure for North America,” said Russ Girling, TransCanada’s president...