If one of your street lights is not working, you can report it.
The Tedaş office will deal with any problems related to power outages, and routine street light repairs.
Here is a link showing their contact details: Tedaş/Electricity
You can phone them to report faulty street lights on 186, but please note they speak Turkish only.
KTLC: KY2 F14 (GRID REF: E5)