A common repowering option is converting a fossil-fired steam unit to a gas-fired combined-cycle plant by addition of a combustion turbine and a Heat Recovery Steam Generator. In this approach the existing steam turbine and related auxiliaries are typically retained and some plant modification is applied. This paper intends to study this option for two old power plants. In this study the HRSGs are modeled, designed and their costs are estimated. Total generating cost for both plants are calculated in order to show whether or not the final cost is competitive with the cost of a new combined cycle unit.

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