Natural gas pipelines, especially in the East Coast, continue to expand. There are 15 proposed pipelines in the works, and as aging coal plants continue to go offline, natural gas will be in even greater demand.

In this "Digging for Value" video, Fool energy and materials analysts Joel South and Taylor Muckerman discuss the future of North American pipelines, including those from the high-producing Marcellus shale and from companies such as Spectra Energy (NYSE:SE) and Kinder Morgan (NYSE:KMI).