Thermal energy storage system coupled with steam cracking system

A steam cracking method for converting a hydrocarbon feedstock into cracked gas, including:

• preheating, by a convection section, a hydrocarbon feedstock and/or dilution steam and to mix the hydrocarbon feedstock with the dilution steam to provide a preheated mixture;
• heating a radiant section configured to convert the preheated mixture into a cracked gas at a high temperature;
• quenching the cracked gas in a cooling section that includes at least one quench exchanger;
• generating thermal energy using electricity generated by an energy source in a thermal energy storage (TES) system;
• providing the thermal energy to generate a heated fluid having a temperature in a target range;
• and
• using a fluid movement system to direct the heated fluid to one or both of the convection section and the radiant section.