Turkey's energy watchdog gave 10 energy companies administrative fines totaling 3.5 million Turkish liras ($1.20 million), according to a statement in the official gazette on Saturday.
The Turkish Energy Regulatory Market (EMRA) fined the energy company due to illegal acts of having a secret tank on the station's premises and keeping an illegal product to add into the fuel and tamper with the quality of the fuel oil.
Additionally,10 companies were asked to write a defense statement for late fee payments and unlicensed acts.
The firms have 60 days to appeal against the fines.
EMRA's core responsibility is to regulate energy, oil, natural gas, electricity, petroleum and LPG markets in the country.