A splitter draws minimal power on its own, but the amount depends on what type of splitter you own
An electrical splitter — also called a power strip or outlet expander — does draw a small amount of power even when nothing is plugged into it. This is called standby power or phantom load. The splitter itself contains internal circuitry and, in many cases, indicator lights and surge protection components that require electricity to function. However, the amount is usually so small that it will not noticeably increase your electric bill.
The actual power draw varies based on the splitter's design. A basic passive splitter with no surge protection and no lights draws almost nothing — typically less than 0.1 watts. A splitter with surge protection, indicator lights, or an on/off switch draws more, usually between 0.5 and 2 watts when idle. To put this in perspective, leaving a splitter plugged in and empty for a full year costs roughly $1 to $3 in electricity, depending on your local rates.
If you want to eliminate even this small draw, you can unplug the splitter when you are not using any of its outlets, or use a splitter with an on/off switch and turn it off when idle.
Key Takeaways
- A basic splitter with no features draws less than 0.1 watts when empty; a splitter with surge protection or lights draws 0.5 to 2 watts.
- The annual cost of leaving an idle splitter plugged in is typically $1 to $3, depending on your electricity rate.
- Splitters with on/off switches let you cut power draw to zero when you are not using the outlets.
- Unplugging the splitter entirely is the only way to eliminate standby power completely.
Why splitters draw power at all
A splitter is not just a passive piece of plastic with holes. Most splitters contain internal components that need electricity to work. Surge protection circuits — the feature that protects your devices from voltage spikes — require power to monitor the incoming current and respond to surges. Indicator lights that show whether the splitter is powered also consume electricity, even if the light is dim.
Some splitters have additional features like USB charging ports, which have their own internal power conversion circuits. These draw more power than a basic splitter, even when no devices are charging. A splitter with a built-in timer or smart features that let you turn outlets on and off remotely will draw even more.
How much power different types of splitters use
| Splitter Type | Standby Power Draw | Annual Cost (at $0.12/kWh) |
|---|---|---|
| Basic splitter, no surge protection | Less than 0.1 watts | Less than $0.10 |
| Splitter with surge protection | 0.5 to 1 watt | $0.44 to $0.88 |
| Splitter with lights and surge protection | 1 to 2 watts | $0.88 to $1.75 |
| Splitter with USB ports | 2 to 4 watts | $1.75 to $3.50 |
| Smart splitter with remote control | 3 to 5 watts | $2.63 to $4.38 |
These figures assume the splitter is plugged in 24 hours a day, 365 days a year with nothing connected. Your actual cost will be lower if you unplug the splitter when you are not using it or if your local electricity rate differs from the $0.12 per kilowatt-hour used in this example.
When standby power actually matters
For most households, the power draw from one idle splitter is negligible. However, if you have multiple splitters throughout your home — in a bedroom, kitchen, home office, and living room — the combined standby load can add up. A house with five splitters drawing 1 watt each uses about 44 kilowatt-hours per year just from idle splitters, which costs roughly $5 at average U.S. rates.
Standby power becomes more noticeable if you are trying to reduce your overall electricity consumption or if you live somewhere with very high electricity rates. In that case, using splitters with on/off switches or unplugging them when not in use makes a measurable difference.
How to reduce or eliminate splitter power draw
The simplest way to cut power draw to zero is to unplug the splitter when you are not actively using any of its outlets. This works well for splitters in guest rooms, seasonal spaces, or areas where you only plug things in occasionally.
If you use a splitter regularly but want to reduce standby power, buy one with an on/off switch. When you turn the switch off, the splitter stops drawing power almost entirely. This is more convenient than unplugging and replugging the splitter multiple times a day.
You can also choose a basic splitter without surge protection or indicator lights if you do not need those features. A plain splitter with no extra components draws almost no power when idle. However, you lose the protection that surge protection provides, so this trade-off only makes sense if your devices are not sensitive to voltage spikes.
Frequently Asked Questions
Will leaving a splitter plugged in increase my electric bill noticeably?
No. A single idle splitter costs less than $3 per year to leave plugged in. You would need many splitters or other devices drawing standby power to see a meaningful increase in your bill. If you have concerns about overall electricity use, focus on larger energy consumers like heating, cooling, and water heating first.
Does a splitter use more power when devices are plugged in but turned off?
The splitter itself does not use more power. However, the devices plugged into it may draw standby power of their own — phone chargers, computer monitors, and appliances in standby mode all consume electricity. The splitter is just the conduit; the devices are responsible for their own power draw.
Is it bad to leave a splitter plugged in all the time?
No, it is safe to leave a splitter plugged in continuously. The small amount of power it draws will not damage the splitter or pose a fire risk. The only downside is the minimal cost of the electricity it uses. Unplug it if you want to save money, but there is no safety reason to do so.
Do power strips with USB ports use more power than regular splitters?
Yes. USB ports contain power conversion circuits that draw 2 to 4 watts even when nothing is charging. If you do not regularly use the USB ports, a basic splitter without them will cost less to operate over time.