There would be no limits on how many times or where you could teleport. The items you hold while teleporting would be teleported too.

Sure, if you choose to change the parameters from what OP said, it might change the outcome.

In addition to what the other commenter said: from the description of OP, the teleportation is basically “magic”, ergo free potential energy (by moving objects from one place to another).

Create a large magnet in a generator that’s very tall, free transport the magnet up to the top, let it fall slowly creating electricity. It’s basically how hydro works: the sun “transports” water, in the form of clouds, to a higher point, gravity pulls it down, we use that to make energy.

Teleportation solves the world energy crisis, invisibility does not.