A peripheral device can be powered off when not in use by redirecting accesses to the peripheral device's configuration space from the peripheral device to a memory located separate from the peripheral device. A method for redirecting accesses includes copying the current contents of the configuration space to the memory. Accesses to the configuration space are redirected to the memory, whereby the memory services the accesses to the configuration space. After the redirection is enabled, the peripheral device can be powered off. When the peripheral device needs to be used again, it is powered on and the contents of the memory are copied to the configuration space. The configuration space can then resume servicing configuration space accesses.