But Occidental's letter notes a concern that it could be "presumed to share the positions" on global warming and regulations to limit air pollution from the nation's fleet of power plants held by organizations of which the company is a member, such as the Chamber of Commerce and the American Petroleum Institute, the largest trade association for the oil and gas industry.

"We do not support all of the positions taken by organizations to which we belong," Occidental's associate general counsel, Linda Peterson, wrote.

Occidental's departure from ALEC comes after several large tech companies left the organization earlier this month. Google, Yahoo, and Yelp publicly announced they have already or are currently divorcing themselves from the coalition. Facebook also stated it was "not likely" to renew its membership with the organization in 2015.