After an unparalleled fall, natural gas prices could double by next year, as a growing number of idle rigs create a supply crunch.

Natural gas prices have tumbled by about 30% this year, as a steep drop in industrial consumption has undermined demand. However, many of the traders and hedge funds that placed speculative bets on the price decline are beginning to reverse course and bet on a price spike, as dwindling production is starting to outpace slumping demand.

Traders trimmed their net short positions on gas by 11% to 114,064 in the week ended March 10, the smallest since last July, Bloomberg News reported. Also, natural gas futures for delivery in January 2010 are trading at a 49% premium to the April contract, which means speculators are anticipating a price surge.

In its short-term energy outlook - released on March 10 - the Energy Information Administration said