With Halloween right around the corner, you’ll probably see tons of ghosts, goblins and ghouls roaming around your neighborhood. But the sneakiest, scariest phantom of all might be living right in your home—and feeding on your electricity.

You can’t see it, but phantom power is being drained from your outlets every day and running up your electric bill. Luckily the culprit is easily stopped.

Electronics and appliances, such as your TV, coffee maker and cellphone charger, draw power from your outlets—even if they’ve been switched off. This phantom power loss occurs because these devices actually switch to standby mode when they are off, but still plugged in. They use enough continuous power to start back up again in a moment’s notice. While this is a modern-day convenience, it’s also wasteful and costly.

While standby power uses significantly less electricity than when the device is turned on and in use, this 24-hour energy drain still adds up on your electric bill. There’s substantial savings to be had when you rid your home of this phantom waste by unplugging unused electronics.

Unplugging used devices could save the average American family about $100 per year, according to ENERGY STAR. And if every family in the U.S. unplugged these energy wasters, collectively we’d save $11 billion in energy waste.

Try one of these tips to rid your home of phantom power:

1. Unplug. When you’re done using appliances and electronics, simply unplug them. Once your cell phone is charged or your coffee is brewed, pull the plug on the appliance so there’s no chance of energy waste.

2. Use a power strip. Make unplugging even easier with a power strip. You can plug multiple devices in to one power strip, then simply switch the strip off to cut off phantom energy.

3. Shut your computer down. Instead of setting your desktop computer to sleep mode, make sure you shut it down completely when you’re done using it. The same can be said for a laptop—turning it off completely means you’ll charge the battery less frequently.

4. Measure energy waste. Many, but not all electronics waste energy. If you’d like to know exactly how much each device is wasting, you can find out by investing in a simple tool. You can pick up an electricity monitor, such as the Kill-A-Watt, for less than $20. Just plug your device into the monitor to see how much electricity it’s using.

5. Check the energy use before you buy. Most electronics come with energy consumption information. You’ll often see this in the form of a bright yellow EnergyGuide label when you’re shopping for an appliance or electronic device, such as a refrigerator, washing machine or TV. Although the amount shown on the tag is just an estimate, it should play an important role in your purchasing decision. Think of it like this: the purchase price of the appliance is the down payment. You’ll continue making payments in the form of energy use once it gets to your home. An appliance with a lower operating cost is going to use less energy and keep more money in your pocket over time.