After more than a decade of making cars and SUVs and, more recently, solar panels Tesla Inc. wants to electrify a new type of vehicle: big trucks.The company unveiled its new electric semitractor-trailer Thursday night near its design...

Electric trucks are having a moment in the spotlight, but they won't replace diesel-powered trucks in big numbers until they overcome costs and other limitations.Tesla Inc. plans to unveil a semitractor-trailer this week, its first foray into trucking afte