LA Times: A smooth road curves toward the hulking ethanol mill that One Earth Energy will open in June. But the path to profitability might be rocky, as the fledgling company could face much larger rivals that have snapped up bankrupt mills at steep discounts. Valero Energy Corp., the country’s largest oil refiner, broke into the farm-grown business last month, buying seven ethanol mills and a development site from bankrupt VeraSun Energy Corp. at a 70% markdown. Other mills could soon …