A billionaire investor who has spent more than $2 million fighting the Keystone XL pipeline is coming to Nebraska to meet with local opponents of the project.

Asset manager and philanthropist Tom Steyer will help dedicate a barn opponents are building in the project's expected path.

Opponents continue to urge President Barack Obama to deny a federal permit for the pipeline that would carry oil from the tar sands of Alberta, Canada, to the American Gulf Coast, saying the project doesn't serve U.S. energy interests and would contribute to global warming. Supporters say the pipeline is by far the safest way to transport the oil.

Steyer, a San Francisco-based donor to Obama and other Democrats, formed a super-political action committee, NextGen, to fight the pipeline. In June, he wrote an open letter to Obama warning he would be engaging the president's own supporters to lobby him on Keystone.

Steyer is to speak at the 3 p.m. Sept. 22 dedication of the solar- and wind-powered barn about 15 miles northwest of York.