Energy Efficiency and Your Home

Ghost Loads

Some of the most common phantom (ghost) load offenders in the typical household.

Also known as "phantom loads", ghost loads are the sneaky devices that constantly consume small amounts of electricity 24 hours a day—even when they're not actually doing anything useful. While each device by itself may not consume much electricity, the combination of all of them within your household may easily consume the equivalent of two or three 60-Watt incandescent light bulbs left on all day and all night. Over the course of a single year this adds up to over 1 Megawatt-hour—in other words, enough electricity to power an entire energy-efficient house for 2 to 3 months!

What are these mysterious ghost loads? The most common examples are the "power brick" adapters, or power supplies, that charge or operate cell phones, laptop computers, cordless drills, answering machines, radios, inkjet printers, and many other household devices. They're actually small transformers, turning AC electricity from the wall outlet into DC electricity for use by the device. While any one of these devices may only consume a small amount of power (e.g., 3-20 watts), a dozen or so of them, running simultaneously and continuously, consume a significant amount of electricity. What's worse is that even when you're not charging your cell phone or the battery for your cordless drill, that AC adapter may continue to consume power just because it's plugged into the wall. Other well-disguised ghost loads are those devices which have the "instant on" feature, such as most modern television sets, VCRs, DVD players, many radios and even many computers. While all of these devices are supposedly turned off, they are actually consuming anywhere from 3 to 20 watts continuously—just to stay ready for you to use them.

The solution to reducing ghost loads - plugs TVs, AC power adapters, etc into a power strip that you can easily turn off when you're not using the device.

How can you decrease the consumption of energy by these parasitic loads? One of the simplest solutions is to simply plug these devices into a power strip which has an off/on switch. When you are done using the devices and shut them off normally, then just hit the off switch on the power strip. Many people make it part of their nightly routine to shut off these power strips just before they go to bed. For AC power adapters that you use at night, like for charging a cell phone, put those on a separate power strip that you turn off during the day when you take your phone with you. Simple solutions like these could reduce your ghost electric loads by as much as 80%. In real-dollars terms, this means saving upwards of $120 per year in electricity costs, depending on your local electric utility rates and how dedicated you are to reducing your ghost loads.

A Special Note for People Who are Planning to Live Off-grid

If you're planning to use an off-grid solar, wind or hydro and plan to have a 12 or 24 volt battery bank, you will often be able to find devices and appliances that work directly with these DC voltages. The benefit to using the devices is that they will not need an AC power adapter which needlessly consumes electricity whether or not the device in use. After all, what an AC adapter plug does is convert normal AC household electricity to DC type of electricity to power the device, and it rarely does that conversion efficiently.