A young cleaning lady is called on to protect a whole city. How? Why? She's seemingly just a normal person and yet she's suddenly given the responsibility of saving everyone. You need to give us more information than this <-- this is based on your first version.
As dpg said, just saying "with powers" is too general. How do her powers relate to the jinn? Why is she the only one who can stop them? why a cleaning lady?? Give her a characteristic too, she's our protagonist, sell her story to us!
I don't think we need to know that they are called jinn (djinn). I don't think it's relevant to the story.
The inciting incident is surely when the jinn first arrive at the city not when the new power source is used. Why can't they just flip the power source back? It seems there is a very easy solution...
The jinn take over humans and give them supernatural powers. Why? They are attracted to the energy source, not humans. What's their motivation for possessing people? Without understanding what they want and/or need, how is anybody going to be able to defeat them.
All these elements need to be connected together. It's too random at the moment. Tie it all up.