A solid polymer fuel cell power plant for unmanned vehicles includes a stack of solid polymer fuel cells, fuel supply and storage systems, thermal control, oxidizer supply, energy storage, and control systems. The power plant continuously generates electricity as hydrogen is supplied to the system, so the power plant is provided with an energy storage system (battery). Such an architecture of the power plant will allow energy recovery at times of low power consumption and its compensation, at the expense of batteries, at times of increased power consumption. These power plants combine thermal control and oxidant supply systems. Distinctive advantages: energy intensity does not depend on ambient temperature, low noise level, no self-discharge and "memory effect", environmental friendliness, high energy intensity and efficiency.