A power generator according to the present invention includes a fuel cell system (101), a combustion system (102), and a controller (103). The fuel cell system (101) includes: a fuel cell (11); a reformer (10) configured to generate a fuel through a reforming reaction between a first raw material containing a hydrocarbon and a second raw material which is water or an oxidant; a first raw material supply device (12); a second raw material supply device (13); and an oxidant supply device (14). The combustion system (102) includes: a first combustor (21); a third raw material supply device (22); a first air supply device (23); and a frame rod (24). The controller (103) controls the first raw material supply device (12) and the second raw material supply device (13) based on an amount of the first raw material supplied to the first combustor (21) and an ionizing current value, such that an amount of the first raw material supplied to the reformer (10) and an amount of the second raw material supplied to the reformer (10) are in a predetermined ratio.
