Mazut Not Viable for Power Plants 

The use of mazut as feedstock in thermal power plants damages the facility and doubles the cost of maintenance and repairs, the deputy head of Hamedan's Shahid Mofateh Thermal Power Plant said.
“As long as the plant is supplied with adequate natural gas as feedstock, burning liquefied fuel is not a viable alternative as its drawbacks outweigh the benefits,” Pejman Akhtari was also quoted as saying by Barq News website.
Using eco-unfriendly mazut has never been and will never be an option for the power station as it incurs expenses. Nonetheless, insufficient gas delivery to the facility leaves it with no choice, but to burn polluting fuels, he added.