Embodiments of the present invention relate to a solution for supplying power to a processor. In some embodiments, there is provided a method for supplying power to a processor. The method comprises, in response to determining that an output voltage of a main power supply supplying power to a processor is lower than a predefined threshold, enabling an additional power supply to supply power to the processor. The method further comprises determining output power of the additional power supply. In addition, the method further comprises, in response to determining that the output power of the additional power supply exceeds peak power limit of the additional power supply, sending, by the additional power supply, a signal to the processor to lower a clock frequency of the processor.