HOUSTON (Reuters) - Exxon Mobil Corp XOM.N plans to invest billions of dollars in the United States due in part to recently approved corporate tax rate cuts, the company's chief executive said on Monday.

A logo of Exxon Mobil is displayed on a monitor above the floor of the New York Stock Exchange shortly after the opening bell in New York, U.S., December 5, 2017. REUTERS/Lucas Jackson - RC17B6EE3C30

Darren Woods, head of the world's largest publicly traded oil producer, said in a blog post on the company's website that Exxon expects to spend $50 billion in U.S. projects over the next five years. The company also is "actively evaluating" projects now in planning stages as a result of new tax and regulatory changes, he wrote. (exxonmobil.co/2DZKArF)

More than $35 billion of that amount is for projects not previously announced, according to company spokesman Scott Silvestri.

Exxon previously pledged tens of billions of dollars for U.S. refining, petrochemical and shale exploration efforts. Last spring, it laid out a $20 billion investment in its U.S. Gulf Coast chemical and oil refining operations through 2022.

The company also is increasing investment in its West Texas and New Mexico shale operations, and moving ahead on a $10 billion petrochemical complex with Saudi Basic Industries Corp in Texas.

U.S. President Donald Trump signed into law a tax reform package last month that cut top corporate income rates to 21 percent from 35 percent and allowed for immediate expensing for capital costs of projects.

“The recent changes to the U.S. corporate tax rate coupled with smarter regulation create an environment for future capital investments,” Woods said, adding Exxon is reviewing “the impact of the lower tax rate on the economics of several other projects currently in the planning stages.”

Woods took over the top job in January 2017 after former chief Rex Tillerson resigned to become U.S. secretary of state.

Exxon is slated to report its quarterly results on Friday.

Shares of Exxon fell 1 percent to close Monday at $88.09 as oil prices CLc1 also fell.