All of the Power Save or PowerSave devices that claim to reduce your electricity bill, actually do not save you money. All of these "Power Saving" devices do the same thing, which is to add capacitance to the AC power line. This improves the Power Factor (PF) for an inductance device, like a fan, electric motor, old fluorescent light ballast, and voltage transformers. By adding capacitance to the circuit, you increase the Power Factor closer to 1 (one), which means you’re decreasing the Volt-Amps value closer to the real-power used value as measured in Watts which is what the electric power company charges you for.