A thermal power plant for recovering water from exhaust gas (13) comprising: a gas turbine (1); a heat recovery steam generator (26) for generating steam by supplying exhaust combustion gas exhausted from the gas turbine (1) as heat source; a water recovery system (17) installed on the downstream side of the heat recovery steam generator (26) for condensing and recovering water in the exhaust combustion gas through direct gas/liquid contact between the exhaust combustion gas coming down from the heat recovery steam generator (26) and water; a recovered water system for supplying a part of the water recovered by the water recovery system (17), thereby allowing the water to be circulating as circulating water; a feed water system for supplying the heat recovery steam generator (26) with other part of the water recovered by the water recovery system (17) as feed water; a first pH adjusting system installed in the recovered water system to adjust the circulating water flowing through the recovered water system to
