NOVELTY - The electrical power generation system (100) has a first fuel cell (120) having a first responsiveness. A second fuel cell (130) has a second responsiveness different from the first responsiveness. A controller (150) is coupled to the first fuel cell and the second fuel cell, such that the controller is configured to engage the first fuel cell to satisfy a portion of a base load (142) and selectively engage the second fuel cell to satisfy a portion of a load increase. The first fuel cell is a different type of fuel cell than the second fuel cell.    USE - Electrical power generation system for used to power vehicles such as automobile, boat, train, or buildings such as residence, or hospital, for use in generating electrical power that includes providing first set of fuel cells including multiple fuel cell stacks and having first responsiveness.    ADVANTAGE - The electrical power generation system operates fuel cells that are relatively more efficient and less responsive to satisfy base loading and operates fuel cells that are relatively less efficient and more responsive to satisfy load fluctuations, thus improving efficiency without sacrificing the ability to satisfy changes in electrical load. The electrical power generation system operates first fuel cell to satisfy the entirety of electrical load that has reduced variability and operates second fuel cell to satisfy the entirety of electrical load that has increased variability. The elements and/or assemblies of the enclosure are constructed from any of a wide variety of materials that provide sufficient strength or durability, in any of a wide variety of colors, textures, and combinations.    DESCRIPTION OF DRAWING(S) - The drawing shows a schematic view of the electrical power generation system that includes a first fuel cell and a second fuel cell having separate fuel and oxidant supplies.    Electrical power generation system (100)    First fuel cell (120)    Second fuel cell (130)    Base load (142)    Controller (150)