According to the theory of energy producing organelles, chloroplasts

>>8668911
your question is too vague to have a meaningful answer.
with enough "modifications" -- of course
but at what point is your "modified mitochondrion" simply something else, with some similarities to a mitochondrion. Obviously at some point they lived outside cells, so with some level of modification they would be able to do so. Also obviously, their evolution has led in a direction where at present they would not be able to.

>>8668911
no im not going there and you know it.

>>8668911
Endosymbiotic theory is not a fact, it's just the most accepted theory, there are several arguments againts it. That being said, there are single celled microorganisms that can create PMF across their outer membrane (using bacteriorhodopsin for instance) which you could maybe say is like an independent mitochondrion.

The mitochondrial genome isn't complete anymore, it's missing some key components that have been moved to the nuclear genome

>>8669418
>there are several arguments againts it
No there aren't, unless by "argument" you mean something written by people at the discovery institute or something.

>>8668911
>that being said,
Do you say this often?

If the definition of Mitochondria includes a symbiotic relationship within a larger cell, then it's likely that one that does not need this symbiosis would have a "different" name.
Therefore--if so--the answer is no: mitochondria can never survive outside the cell.
Most questions can't be easily answered because they are senseless so they have no answer.

Rickettsia is basically the modified mitochondrion you're talking about.
https://en.wikipedia.org/wiki/Rickettsia_prowazekii

>>8669602
sit down brainlet

The mitochondrial genome contains a tiny fraction of the necessary genes for mitochondrial survival. Most proteins in a mitochondrion are coded for by genes in the nucleus. So to answer your question, no, unless you have a ridiculously generous definition of 'modified mitochondria.' A modified mitochondrion can survive outside a cell in the same sense that a modified human can play ping pong in outer space without a spacesuit.

>>8668911
>mitochondria
https://en.wikipedia.org/wiki/Rickettsiales
Pretty cool, no?