Envia Energy broke ground Friday on a the first of a series of gas-to-liquids plants under development by an array of Houston-based companies, according to FuelFix. Envia is a joint venture between Houston-based Waste Management, NRG Energy and Ventech Engineers International in conjunction with Velocys, a U.K.-based company. According to FuelFix: The plant will be built next to Waste Management's East Oak landfill in Oklahoma City, marking the first step in a plan by the joi...