The only electric Semis in production are prototypes. Coca-Cola bought the first one and it cost over 1 million dollars. They are far too heavy to haul a full tractor trailer load, which can weigh as much as 48,000LBS. Add that to the fact that there are currently no semi charging stations available. Of course it can accelerate faster, with an empty trailer, or no trailer at all. All of those companies "claiming" to have ordered them, are the same companies that lost millions on the CNG semis. Only to later convert them back to diesel or scrap them altogether. Ask Knight about CNG. They were on the verge of bankruptcy over CNG until they were bought out by Swift.
Electric Semis sounds good to the "Greenies", but in reality, it's a gimmick. The cost of the electric semi alone makes it unprofitable. And they have yet to get an electric semi that can travel 500 miles, which is an easy day for me. Add in load weight, mountainous terrain, traffic, etc. and your range just dramatically decreased. Then what, stuck on the side of the interstate without a charging station in site?