Natural-gas prices rocketed more than 10% to a four-year high Wednesday on concerns that sustained frigid weather would lead to robust demand for the heating fuel well into February. Natural gas for February delivery jumped 52.4 cents to $5.557 a million British thermal units on the New York Mercantile Exchange, the highest closing price since Jan. 25, 2010. Futures posted their largest one-day percentage gain since June 14, 2012. The February contract expired at settlement. The more actively traded March contract rose 52.4 cents, or almost 11%, to $5.465/mmBtu. Prices have soared 31% this month as forecasts continue to call for colder-than-average weather, maintaining demand for indoor heating sources. About half of U.S. households use natural gas as their primary heating fuel, according to the U.S. Energy Information Administration. The February contract surged late in the session Wednesday. The buyers […]