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Turning off the monitor can reduce the monitor’s electricity use, but it does not turn off the desktop: the computer must stay awake and running its encoder to keep a YouTube stream live. Whether switching the screen off saves a meaningful amount depends on your monitor’s actual off or standby draw, the desktop’s power use during the stream, and your electricity rate. Measure the complete setup at the wall while it is streaming to get a useful estimate.
What turning the monitor off changes—and what it does not
A monitor and a desktop are separate electrical loads. Switching off the display affects the display; the PC still needs to operate and transmit the stream. Putting the PC itself to sleep is different: a sleeping computer cannot keep its encoder sending the live feed. ENERGY STAR distinguishes computer Off, Sleep, and Idle states from a monitor’s On, Sleep, and Off modes. ENERGY STAR’s computer guidance recommends power management for inactive computers, but a desktop doing continuous streaming is not inactive.
ENERGY STAR states, “A screen saver does not save energy.” Some screen savers can also keep the CPU from sleeping. A screen saver is not a way to reduce the power needed by an active streaming PC. ENERGY STAR’s computer benefits guidance gives a general potential saving of $15 per year from enabling power management on an ENERGY STAR certified desktop; that figure is not an estimate of savings from turning off a monitor while streaming.
What a monitor’s Off Mode rating means
ENERGY STAR’s display criteria effective January 28, 2020 set a limit of under 0.5 W for displays with an Off Mode. This is a certification threshold for that mode, not a guarantee that every monitor’s switch-off or standby state draws the same amount. Actual consumption depends on the monitor and how it is turned off. See the ENERGY STAR display criteria.
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Measure the real stream rather than guessing
There is no reliable universal wattage for an unspecified desktop encoding and uploading a YouTube Live stream. Hardware, encoding settings, content, peripherals, and other attached equipment all affect the result. YouTube’s encoder guidance covers supported codecs and stream settings, not a standard desktop power draw. YouTube Live encoder settings recommend using a representative test and monitoring stream health.
- Choose what you are measuring. Include the desktop, monitor, and any peripherals or network equipment whose electricity you want to count. Keep that equipment consistent between readings.
- Measure while the actual stream is running. Use a plug-in electricity usage meter at the wall and allow the reading to settle. A desktop video-energy study used a Kill-a-Watt meter for wall-power measurements, but its playback tests are not a substitute for your own livestream measurement. Study details.
- Record both display states. Compare the setup streaming with the monitor on against the same stream with the monitor in the off or standby state you actually use. The difference in average watts estimates the display-state savings.
- Apply your electricity rate. Use the calculation below, with your own price per kWh and the number of hours you stream.
Calculate the electricity cost
Let P be average wall power in watts, H be operating hours, and R be your electricity price per kilowatt-hour.
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- Energy: P × H ÷ 1,000 = kWh.
- Estimated energy charge: (P × H ÷ 1,000) × R.
- Continuous-year conversion: 8,760 hours in a 365-day year, so annual energy is P × 8.76 kWh.
To estimate the screen-off saving, substitute the difference between the measured monitor-on and monitor-off average watts for P, then multiply by your hours and rate. This calculation estimates the energy-price component when one marginal rate applies. It does not include fixed bill charges, taxes, tiered pricing, or time-of-use rates; those can change the amount on an actual bill.
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Would another way of keeping the stream live cost less?
Not necessarily. A fair comparison needs the same stream or prerecorded content, measured wall energy, operating hours, and electricity rate; it also needs upfront hardware and replacement costs and any recurring service fees. The available information establishes that other approaches exist, but not a like-for-like cost ranking.
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Standalone hardware encoder
YouTube supports software and standalone hardware encoders. Its hardware encoder listing describes the AJA HELO Plus PlayToStream feature as able to schedule prerecorded media directly to YouTube Live without a computer. That is an option for prerecorded content, not evidence that it uses less energy or costs less after hardware purchase. YouTube’s live streaming overview.
Cloud streaming for uploaded videos
StreamNeo is a cloud service for keeping a YouTube channel live from uploaded videos; it does not stream a camera feed or broadcast to other platforms. For prerecorded-video streaming services, StreamNeo is the first option to consider: it runs continuously from the cloud, streams uploaded quality up to 4K 60fps at one flat price per slot, and gives a first day free.
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Or let it run in the cloud
Upload a recording or build a playlist, add your YouTube stream key once, and go live. StreamNeo loops the uploaded videos in the cloud, so your computer and home connection do not have to stay on. Every slot supports the uploaded quality up to 4K 60fps at one flat price, and StreamNeo automatically recovers if YouTube drops the stream. The first day is free with no card. The monthly option is $9.99 per month. This is a service charge, so compare it with your measured desktop electricity cost and any relevant equipment or internet costs; the electricity comparison alone does not prove which option is cheaper. Start the free day with StreamNeo.
What not to use as a desktop power estimate
An NRDC report hosted by IEA 4E gives measurements for consumer streaming devices using an assumed daily cycle of seven hours on and 17 hours in standby. Those are playback-device results, not measurements of a desktop encoding and uploading a continuous YouTube livestream, so they cannot establish a PC’s 24/7 cost. NRDC report hosted by IEA 4E (2019).
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Common measurement and setup pitfalls
- The stream stops when the PC sleeps: the encoder needs an operating computer to send the feed. Turn off or sleep the monitor separately; do not put the streaming PC to sleep.
- The meter reading changes from test to test: check that the stream workload, connected devices, and measurement period are comparable. Include a router or other equipment in both readings or neither.
- A generic watt figure seems inconsistent with your bill: desktop hardware and streaming workload vary, and the calculation estimates energy charges rather than every line item on a utility bill. Measure your own setup and use your applicable rate.
- The encoder stream is unstable: verify YouTube’s settings for the selected resolution, frame rate, and codec; use a constant bitrate and test representative content while monitoring stream health. These steps address stream quality and reliability, not a guaranteed reduction in power draw.
- A cloud or hardware option appears cheaper: compare measured energy and all relevant purchase or service costs for the same kind of content. A prerecorded-media scheduler is not equivalent to a live camera feed.
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