San Francisco — Tesla will unveil its electric Tesla Semi-truck on Thursday evening in southern California. It’s all part of CEO Elon Musk’s "master plan part deux" in which he vowed to expand the company’s line-up to "cover the major forms of terrestrial transport". Expect another late-night party stocked with friends and fans, potential Tesla Semi customers and state and local elected officials. Among the details that will help gauge the Semi’s viability will be total cost of ownership as measured by cost of energy per mile, range, level of autonomy and infrastructure needs. Will there be super-Superchargers? Where is Tesla planning to make this truck? Musk may have some answers. While electric passenger cars get all the buzz, the move to electrify big-rigs — as well as transit buses — has been moving swiftly under the radar, and Tesla is far from the only player. The urgency is particularly acute in California, where trucks are a big part of the state’s emissions profile and buse...

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