Californians are expecting skyrocketing natural gas bills this month, but this can’t all be blamed on the weather, according to industry insiders. Southern California Gas Company (SoCalGas), which serves about 5.9 million households and businesses, warned customers to expect “shockingly high” January bills that could be 128 percent higher compared to December. Those who typically paid around $65 a month last winter are likely to pay about $160 this year, SoCalGas said in a statement Dec. 29. Those with bills around $130 a month could see charges jump to $315. Last December, wholesale natural gas prices already cost five times...