On December 21, 2009, "[[Exxon Mobil]] finalized terms to buy [[XTO Energy]] for $31 billion, which included XTO’s rights to 47,000 acres of a lucrative section of the [[Marcellus shale]]. The buyout of [[XTO Energy]] by [[Exxon Mobil]] could be off if Congress makes hydraulic fracturing illegal, according to language in the contract. The contract stipulates that the $31 billion deal could be terminated if Congress finds the practice unlawful. Rep. [[Ed Markey]], D-Mass., chairman of the energy and environment subcommittee of the Energy and Commerce Committee, said that he plans hearings next year to examine industry practices, including "some of these unconventional extraction techniques." <ref>[http://www.oleantimesherald.com/articles/2009/12/22/news/doc4b30f3f586149216762283.txt] "Local economies look for boost from natural gas exploration in region’s Marcellus shale," Adam Voster, Ocean Times Herald, December 22, 2009 </ref>