HARTFORD, Conn. (AP) — Pipeline bottlenecks that drove up natural gas home heating prices in New England last winter could cause trouble when the weather again turns cold, but oil prices that once climbed to record territory continue to fall.

That unusual sequence of events — higher prices for natural gas prices, which is promoted for its cost advantage relative to oil that’s falling in price — was detailed by the U.S. Department of Energy’s recent annual outlook. The wild card is the weather and how cold this winter will be.