st natural gas pipeline boom in nearly 20 years is unfolding in the US South as companies build systems to feed massive export terminals rising along the Gulf of Mexico. As many as 12 projects to install new pipelines or expand existing ones are on pace to be completed next year in Texas, Louisiana and Oklahoma, increasing the region’s capacity to ship gas by 13%, according to data compiled by Bloomberg from US Energy Information Administration estimates. It will mark the biggest one-year expansion for Gu ...