A few months ago I purchased a Souwa Power Save - Electricity Savings Box. I was skeptical about it working, but a couple of acquaintances had told me about it. Since it cost less than $15.00 I decided to give it a try. I found one on Amazon (several brands available, but I elected to use the brand that had been recommended to me).
Today I started pulling together all of my tax related items and printed out my electric bills for 2018. Imagine my surprise when I compared last year's monthly bills to this year's bills. Although the first three months of use showed reductions I wasn't that impressed; but the last 7 months leveled out at a full 25% reduction in my monthly bills. Since my usage is pretty constant, with bills showing up within $10.00 of each each month before the Box, they are now within $3.00 of each other each month. And my use has not been reduced at all.
So, I recommend giving the box a try. Here is the info about the box listed on Amazon:
If you buy one please let me know how it works for you!