Gas flaring near Highway 85 southwest of Williston. Analysts estimate that almost 30 percent of the gas being produced in the state is burned off. Jeff Brady/NPR hide caption

itoggle caption Jeff Brady/NPR

A drilling site rises from the middle of farmland near Fairfield, N.D. Many farmers and ranchers are profiting from the state's oil boom, but others complain that drillers are interfering with their business. Jeff Brady/NPR hide caption

itoggle caption Jeff Brady/NPR

Propane cylinders sit on the grounds of Blue Rhino, a propane gas company, in Tavares, Fla. In the Midwest, farmers needed more propane for crops that came in later than normal. Gerardo Mora/Getty Images hide caption

itoggle caption Gerardo Mora/Getty Images

The Deepwater Horizon oil rig burns in the Gulf of Mexico in April 2010. Gerald Herbert/AP hide caption

itoggle caption Gerald Herbert/AP

The building at 120 East 81st Street is among those converting from an oil- to natural-gas-burning furnace. Jeff Brady/NPR hide caption

itoggle caption Jeff Brady/NPR

Lela Petersen, owner of the Anything And Everything store in Flagler, Colo., expects the cost of health insurance for her and her husband to drop by my more than half next year. Jeff Brady hide caption

itoggle caption Jeff Brady

Apologetic signs posted at a gas station that ran out of gas on Nov. 1, 2012, in the Queens borough of New York. Jason DeCrow/AP hide caption

itoggle caption Jason DeCrow/AP

The Deepwater Horizon oil rig is seen burning in the Gulf of Mexico in April 2010. A second phase of the BP trial, which started this week, looks at just how much oil spilled into the Gulf. Gerald Herbert/AP hide caption

itoggle caption Gerald Herbert/AP