Thermal energy storage system coupled with steam cracking system

A steam cracking system for converting a hydrocarbon feedstock into cracked gas, comprising:

• a convection section configured to preheat a hydrocarbon feedstock and dilution steam and to mix the preheated hydrocarbon feedstock with the dilution steam to provide a preheated mixture;
• a radiant section configured to convert the preheated mixture into a cracked gas at high temperature;
• a cooling section including at least one quench exchanger configured to quench the cracked gas;
• a thermal energy storage (TES) system configured to store thermal energy derived from electricity generated by an energy source and converting the electricity into heat for storage in a thermal energy storage medium and providing the stored heat to heat a fluid to a temperature in a target range;
• and
• a fluid movement system configured to direct the heated fluid into the steam cracking system at a high temperature as either a sole heat source or a supplementary heat source in combination with a primary heat source.