Do we have unlimited electricity

Answer 1

Practically speaking, yes, within certain limits. As long as we have sun, wind, waves or atoms we can split, we can produce electricity. However, the question is practicality and whether we'd want to. Solar collectors and wind turbines can kill birds in some instances.

Another complication would be if the world lost its manufacturing base. So while sun is abundant, if you cannot create solar cells, then there is no way to use the sun that way.

Answer 2

it can run out if it comes from a temporary source (i.e. a battery). but otherwise it can be renewed using a generator.