The United States economy is slowly growing, as evidenced by the seasonally adjusted GDP of 3.2% this past quarter. Another metric showing more economic activity is the 1.4% growth in electricity demand in 2013. Coal powered electricity grew last year, producing 39% of all electricity generated, again displaying the long-term viability of coal. Make no mistake, coal use has peaked in the United States, and while plenty of coal miners offer tremendous values in today's market, natural gas momentum is increasing. 

In the following video, two outstanding natural gas pipeline companies are detailed. Both are positioned nicely to supply the eastern United States with natural gas for years to come. 

This segment is from Thursday's edition of "Digging for Value," in which sector analysts Joel South and Taylor Muckerman discuss energy and materials news with host Alison Southwick. The twice-weekly show can be viewed on Tuesdays and Thursdays. It can also be found on Twitter, along with our extended coverage of the energy and materials sectors @TMFEnergy.

Joel South has no position in any stocks mentioned. Taylor Muckerman has no position in any stocks mentioned. The Motley Fool recommends Spectra Energy. Try any of our Foolish newsletter services free for 30 days. We Fools may not all hold the same opinions, but we all believe that considering a diverse range of insights makes us better investors. The Motley Fool has a disclosure policy.