Kinder Morgan's bid for El Paso Corp. shows that the U.S pipeline system and exploration-and-production companies are undergoing fundamental change, writes Liam Denning. "The opening of vast new unconventional resources in areas like the Marcellus formation in the northeastern U.S. demands reconfiguring an old pipeline system geared largely to shipping fuel from the Gulf coast and Canada to U.S. cities," he writes.

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