When the 20-inch gas pipeline next to Interstate 77 in West Virginia first ruptured on Tuesday, nobody at pipeline operator, Columbia Gas Transmission, knew it.
Now, the National Transportation Safety Board is trying to find out why. NTSB member Robert Sumwalt says no warning went off in the operating company's control center in nearby Charleston, so investigators are going there to interview staffers and review data.
PBS NewsHour continues their energy series with a visit to Colorado. Coal has been a traditional source of electrical energy in the state, but now a new energy source - natural gas - is making inroads.
A proposed study of people in northern Pennsylvania could help resolve a national debate about whether the natural gas boom is making people sick.
The study would look at detailed health histories on hundreds of thousands of people who live near the Marcellus Shale, a rock formation in which energy companies have already drilled about 5,000 natural gas wells.
If the study goes forward, it would be the first large-scale, scientifically rigorous assessment of the health effects of gas production.