TECHNOLOGY FOCUS - INSTRUMENTATION AND TESTING - Preferred Method: The flue gas moisture condensing arrangement comprises a direct contact heat exchanger or an indirect heat exchanger. The heat transfer agent comprises air, where the supply arrangement includes at least one motor-driven fan which causes a stream of air to effect cooling of liquid coolant flowing through the dump cooler from the condensing heat exchanger. In the method, air flow rate produced by the motor-driven fan is controlled to regulate the quantity of condensate produced by the condensing heat exchanger. The rotational speed of the fan is controlled to vary the air flow rate produced thus to regulate the quantity of condensate produced by the condensing heat exchanger. The heat transfer agent comprises an aqueous liquid, where the supply arrangement includes at least one agent pump which causes the aqueous liquid to flow through the dump cooler thus to effect cooling of liquid coolant flowing through the dump cooler from the moisture condensing arrangement. The aqueous liquid flow rate produced by the agent pump is controlled: to regulate the quantity of condensate produced by the moisture condensing arrangement; and by adjusting at least one of the pumping rate or a throttling valve associated with the flow, thus to regulate the quantity of condensate produced by the moisture condensing arrangement. The liquid coolant flow rate produced by the coolant pump is controlled by adjusting the pumping rate or a throttling valve associated with the flow, thus to regulate the quantity of condensate produced by the moisture condensing arrangement. The flue gas is passed through a condensing economizer separate from the boiler and installed in a flue gas path from the boiler to a stack, and the moisture condensing arrangement forms a part of the condensing economizer. The condensing economizer has three stages controlled so that in the first stage the flue gas is cooled to or below the acid dew point for the flue gas, in the second stage the moisture condensing arrangement further cools the flue gas to produce condensate, and in the third stage the flue gas is demisted and reheated for discharge through the stack. The heat extracted in the first stage is used to: provide thermal energy to ancillaries associated with the plant, thus reducing the demand by those ancillaries for steam originating from the boiler; and to re-heat the flue gas before discharge through the stack. The condensate from the moisture condensing arrangement is collected in a tank, where the level of condensate in the tank or outflow from the tank is monitored, and the monitored level or outflow rate is used to control operation of the dump condenser system. The heat from the moisture condensing arrangement is used to preheat combustion air for the boiler. The condensate from the moisture condensing arrangement and condensed steam from equipment powered by steam produced by the boiler are combined at least to contribute to the water demand of the plant. The steam produced by the boiler is used to drive a condensing steam turbine and an air-cooled vacuum condenser recovers the water of spent steam from the turbine, where the condensate from the moisture condensing arrangement and water from the vacuum condenser are combined and together substantially meet the total water demand of the plant including the boiler make-up water and the water demand of other services associated with the plant. EXAMPLE - No suitable example given.