A power generation system, comprising: a first heating fluid circuit thermally coupled to a first plurality of heat sources (102a-102j) from a first plurality of sub-units of a petrochemical refining system, the first plurality of sub-units comprising a continuous catalytic reforming and aromatics refining system; a second heating fluid circuit thermally coupled to a second plurality of heat sources (103a-103c) of a second plurality of sub-units of the petrochemical refining system, the second plurality of sub-units comprising the continuous catalytic reforming and aromatics refining system; a third heating fluid circuit thermally coupled to a third plurality of heat sources (105a-105j) from a third plurality of sub-units of the petrochemical refining system, the third plurality of sub-units comprising a hydrocracking-diesel hydrotreating system; a first power generation system that comprises a first organic Rankine cycle, the first ORC comprising i) a first working fluid that is thermally coupled to the first and second heating fluid circuits to heat the first working fluid, and ii) a first expander configured to generate electrical power from the heated first working fluid; a second power generation system that comprises a second organic Rankine cycle, the second organic Rankine cycle comprising i) a second working fluid that is thermally coupled to the third heating fluid circuit to heat the second working fluid, and ii) a second expander configured to generate electrical power from the heated second working fluid; and a control system configured to actuate a first set of control valves to selectively thermally couple the first heating fluid circuit to at least a portion of the first plurality of heat sources, the control system also configured to actuate a second set of control valves to selectively thermally couple the second heating fluid circuit to at least a portion of the second plurality of heat sources, the control system also configured to actuate a third set of control valves to selectively thermally couple the third heating fluid circuit to at least a portion of the third plurality of heat sources. a first heating fluid circuit thermally coupled to a first plurality of heat sources (102a-102j) from a first plurality of sub-units of a petrochemical refining system, the first plurality of sub-units comprising a continuous catalytic reforming and aromatics refining system; a second heating fluid circuit thermally coupled to a second plurality of heat sources (103a-103c) of a second plurality of sub-units of the petrochemical refining system, the second plurality of sub-units comprising the continuous catalytic reforming and aromatics refining system; a third heating fluid circuit thermally coupled to a third plurality of heat sources (105a-105j) from a third plurality of sub-units of the petrochemical refining system, the third plurality of sub-units comprising a hydrocracking-diesel hydrotreating system; a first power generation system that comprises a first organic Rankine cycle, the first ORC comprising i) a first working fluid that is thermally coupled to the first and second heating fluid circuits to heat the first working fluid, and ii) a first expander configured to generate electrical power from the heated first working fluid; a second power generation system that comprises a second organic Rankine cycle, the second organic Rankine cycle comprising i) a second working fluid that is thermally coupled to the third heating fluid circuit to heat the second working fluid, and ii) a second expander configured to generate electrical power from the heated second working fluid; and a control system configured to actuate a first set of control valves to selectively thermally couple the first heating fluid circuit to at least a portion of the first plurality of heat sources, the control system also configured to actuate a second set of control valves to selectively thermally couple the second heating fluid circuit to at least a portion of the second plurality of heat sources, the control system also configured to actuate a third set of control valves to selectively thermally couple the third heating fluid circuit to at least a portion of the third plurality of heat sources.