Technical and economic feasibility of heating feed water of a co-generation power plant through integrate parabolic trough solar collectors has been provided in this work. The extracted steam from steam turbine to the highest-pressure feed water heater is saved by assistance of solar energy, thus decreasing fuel consumption in steam boiler. The study is based on a 62 MW Heavy fuel oil fired power plant for Shoaiba weather conditions. A numerical simulation model was created by TRNSYS simulation software to find the annual performance of the power plant integrated with solar system. The results are validated with the measured data of the conventional power plant. The annual performance of the system is estimated as the average solar power generation and solar fraction in FWH. It was found that Optimum at which the system the maximum LCS was obtained and equal 41.5 $M at 150,000 m2. It can achieve an annual solar fraction of about 28% which 1.72E+11 kJ. Economic feasibility analysis is considered in this work to estimate the life cycle savings (LCS), levelized cost of energy (LCOE) and amount of fuel saved. Based on the economic study, the payback lifetime is about 14.6 years. An economic advantages of reducing the fuel consumption and reducing the CO2 emissions are the main benefits of this study. This study summarized that total of 4,619 tons fuel can be saved and 777.34 tons CO2 can be avoided. It can be concluded that, the integration of higher-pressure feed water heater with solar energy is found feasible in terms of LCS. Same methodology can be applied on other plants around