SAN DIEGO – Sempra Energy proposed Monday to more than double capacity at its liquefied natural gas terminal under construction in Mexico, strengthening its position in the race to build the first such plant on North America's Pacific coast. Sempra is building in Mexico at a time when rivals seeking permission in California are stumbling over opposition from environmental and NIMBY – “not in my back yard” – groups. The expansion plan is a response to “significant interest we have received from a number of potential natural gas producers and marketers,” said Darcel Hulse, president of Sempra's LNG unit. Sempra...