A fuel cell power plant comprising: a stack of vertically disposed fuel cells, each fuel cell including a membrane electrode assembly with an electrolyte having cathode and anode catalysts disposed on opposite sides thereof, each membrane electrode assembly being separated from a membrane electrode assembly adjacent thereto in said stack by a hybrid separator plate; each of said hybrid separator plates comprising a solid fuel flow field plate having horizontal fuel reactant gas flow channels extending inwardly from a first surface thereof, and a porous and hydrophilic oxidant flow field plate having vertical oxidant flow channels extending inwardly from a first surface thereof, a second surface of said oxidant flow field plate, opposite to said first surface thereof, bonded to a second surface of said fuel flow field plate which is opposite to said first surface thereof, to form said integral, hybrid separator plate, there being horizontal water passageways adjacent to said second surfaces of said plates (105, 115), wherein said water passageways are disposed over limited upper portions of said fuel flow field plates which are adjacent to portions of said membrane electrode assemblies that do not have catalysts, which portions are therefore inactive, wherein said water passageways extend inwardly from an upper end of said second surface of said fuel flow field plate, and wherein said fuel reactant gas flow channels extend only from a portion of said first surface of said fuel flow field plate which is opposite to a related portion of said second surface of said fuel flow field plate having no water passageways. a stack of vertically disposed fuel cells, each fuel cell including a membrane electrode assembly with an electrolyte having cathode and anode catalysts disposed on opposite sides thereof, each membrane electrode assembly being separated from a membrane electrode assembly adjacent thereto in said stack by a hybrid separator plate; each of said hybrid separator plates comprising a solid fuel flow field plate having horizontal fuel reactant gas flow channels extending inwardly from a first surface thereof, and a porous and hydrophilic oxidant flow field plate having vertical oxidant flow channels extending inwardly from a first surface thereof, a second surface of said oxidant flow field plate, opposite to said first surface thereof, bonded to a second surface of said fuel flow field plate which is opposite to said first surface thereof, to form said integral, hybrid separator plate, there being horizontal water passageways adjacent to said second surfaces of said plates (105, 115), wherein said water passageways are disposed over limited upper portions of said fuel flow field plates which are adjacent to portions of said membrane electrode assemblies that do not have catalysts, which portions are therefore inactive, wherein said water passageways extend inwardly from an upper end of said second surface of said fuel flow field plate, and wherein said fuel reactant gas flow channels extend only from a portion of said first surface of said fuel flow field plate which is opposite to a related portion of said second surface of said fuel flow field plate having no water passageways.