An electric generator , comprising, a rotor arranged along a centerline of the generator ; a core arranged coaxially and surrounding the rotor ; a plurality of stator windings arranged within the core ; a stator frame arranged to fixedly support the core and rotationally support the rotor ; a gas cooling system configured to circulate a cooling gas within the generator ; a liquid cooling system configured to circulate a cooling liquid to cool the stator windings wherein the cooling ability of the liquid cooling system is a function of a required generator parameter; a pressure boundary member that surrounds a portion of the rotor and an entirety of the core and stator windings , the pressure boundary member configured to operatively contain an internal pressure of two bar relative to atmospheric pressure; a pressurizing system configured to operatively pressurize the cooling gas to a maximum pressure of two bar relative to atmospheric pressure, wherein the pressurizing system is configured to continuously determine the cooling gas pressure based upon a required generator parameter; and a control system configured to control the cooling ability of the liquid cooling system in conjunction with the cooling gas pressure as a function of the required generator parameter; wherein the control system is configured to sense an output power of the electric generator , and to compare the sensed output power to an operational load demand of the electric generator , and to determine an optimum operating pressure of the cooling gas based on a predetermined control scheme, wherein the operational load demand is a required power output demand from the grid and associated operating conditions, wherein the pressurizing system is configured to adjust an operating pressure of the cooling gas in accordance with the determined optimum operating pressure. a rotor arranged along a centerline of the generator ; a core arranged coaxially and surrounding the rotor ; a plurality of stator windings arranged within the core ; a stator frame arranged to fixedly support the core and rotationally support the rotor ; a gas cooling system configured to circulate a cooling gas within the generator ; a liquid cooling system configured to circulate a cooling liquid to cool the stator windings wherein the cooling ability of the liquid cooling system is a function of a required generator parameter; a pressure boundary member that surrounds a portion of the rotor and an entirety of the core and stator windings , the pressure boundary member configured to operatively contain an internal pressure of two bar relative to atmospheric pressure; a pressurizing system configured to operatively pressurize the cooling gas to a maximum pressure of two bar relative to atmospheric pressure, wherein the pressurizing system is configured to continuously determine the cooling gas pressure based upon a required generator parameter; and a control system configured to control the cooling ability of the liquid cooling system in conjunction with the cooling gas pressure as a function of the required generator parameter; wherein the control system is configured to sense an output power of the electric generator , and to compare the sensed output power to an operational load demand of the electric generator , and to determine an optimum operating pressure of the cooling gas based on a predetermined control scheme, wherein the operational load demand is a required power output demand from the grid and associated operating conditions, wherein the pressurizing system is configured to adjust an operating pressure of the cooling gas in accordance with the determined optimum operating pressure. <EOS>