- #36

#### anorlunda

Staff Emeritus

- 11,211

- 8,635

No I can't find a good reference, so you may be right it could be a guess or a legend. Let's try to estimate it ourselves for the year 2001.Is there some solid, certified published reference for this?

- 15 w per wall wart x 24 hours
- standby power 30 w per TV or stereo for 24 hours
- Let's say 5 wall warts plus 3 TV/stereo per household.
- 24*(5*15+3*30) about 4 kWh/day.
- Say 100M households, but only 75M affluent enough for so many devices.
- 75M * 4 kWh/day = 300M kWh/day, 300M*365 = 109 billion kWh/year.
- Reliable source https://www.eia.gov/totalenergy/data/monthly/pdf/sec7_2.pdf Shows total generation in 2001 at about 3500 billion kWh/year.
- 109/3500 = 3%

So my estimate is only half of the 6% number. But it is in the same order of magnitude, and for a back-of-the-envelope guess, not bad.

[I used the strange units "billion kWh/year" to make it easy to compare with my source.]

Now, think of 2021. My wife and I have 5 digital devices @0.1 watts, + (1 TV + 2 laptop) @2 watts. That is 6.5 watts wasted on standby power compared to 165 watts in 2001. The difference is major.