Fuel cell system

A fuel cell system comprising:

• a first fuel cell;
• a second fuel cell having a maximum power output that is greater than a maximum power output of the first fuel cell;
• and
• a power generation controller configured to control power generation from the first fuel cell and the second fuel cell in accordance with requested power,
• wherein,
• when the requested power is smaller than a first threshold, the power generation controller is configured to cause the first fuel cell to generate electric power greater than electric power generated by the second fuel cell so that the requested power is supplied,
• when the requested power is equal to or greater than a second threshold and smaller than a third threshold, the power generation controller is configured to cause the second fuel cell to generate electric power greater than electric power generated by the first fuel cell so that the requested power is supplied, the second threshold being equal to or greater than the first threshold, the third threshold being greater than the second threshold, and the third threshold also being equal to or greater than 70% of the maximum power output of the second fuel cell and equal to or smaller than 100% of the maximum power output of the second fuel cell, and
• when the requested power is equal to or greater than the third threshold, the power generation controller is configured to cause both the first fuel cell and the second fuel cell to generate electric power so that the requested power is supplied.