Tesla Semi truck unveil set for September.

The busiest man in tech already faces looming deadlines for getting a battery factory up to speed, the Model 3 out the door, and a secret payload (probably a spy satellite) into orbit.

Turns out he’s got a team working on a battery-powered truck he will reveal in September, as part of his master plan to shift the world to sustainable energy.

Plans for such a truck, if they truly exist, almost certainly call for batteries alone, because Musk disdains hybrids and range-extended electrics like the Chevrolet Volt.

The frame of a semi is essentially a pair of long steel rails, which could easily support a battery pack (which also could go behind the cab).

Ditching the internal combustion engine saves more space, and lets you use smaller motors on each axle or even each wheel.

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