The invented stacked switched capacitor (SSC) energy buffer circuits include switches and a plurality of energy storage capacitors. The switches are disposed to selectively couple the capacitors to enable dynamic reconfiguration of both the interconnection among the capacitors and their connection to a buffer port. The switches are cooperatively operated as a switching network such that the voltage seen at the buffer port varies only over a small range as the capacitors charge and discharge over a wide range to buffer energy. The switching network need only operate at a relatively low switching frequency, and can take advantage of soft charging of the energy storage capacitors to reduce loss. Thus, efficiency of the SSC energy buffer circuit can be extremely high compared to the efficiency of other energy buffer circuits. Since circuits utilizing the SSC energy buffer do not need to utilize electrolytic capacitors, they overcome the associated limitations. Without electrolytic capacitors, a high effective energy density can be achieved with a relatively high efficiency across a desired operating range.