Tesla on Thursday announced that the electric vehicle maker was beginning deliveries of its Semi trucks to customers this week.Executives at Tesla's plant in Sparks, Nevada, made the announcement that the first customers will take delivery of the electric big rigs about nine years after CEO Elon Musk first announced the company's plans to develop the long-haul freight trucks.The Semi aims to open a new market for Tesla, which has long been known for its EV sedans and SUVs, by creating an electric option for commercial freight haulers.The announcement comes at a time when diesel prices have sur...