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1. A combined cycle power plant (CCPP) comprising: a gas turbine having a compressor section, a combustion section, and a turbine section; a heat recovery steam generator (HRSG) having a high pressure economizer, comprising a forward high pressure economizer and an aft high pressure economizer in series, and a low pressure economizer, the HRSG receiving a flow of exhaust gas from the turbine section; a fuel heating system comprising a fuel supply line and a high temperature heat exchanger disposed in thermal communication on the fuel supply line, the fuel supply line fluidly coupled to the combustion section, the high temperature heat exchanger fluidly coupled to the forward high pressure economizer such that the high temperature heat exchanger receives water from the forward high pressure economizer; and a feedwater pump fluidly coupled to the high temperature heat exchanger, wherein a first pump supply line extends from the low pressure economizer to a first inlet of the feedwater pump, and wherein the high temperature heat exchanger is fluidly coupled to a second inlet of the feedwater pump via a second pump supply line.
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