the only sure way i know to save money on electricity, without wind mills or solar panels all over your house/property, is to steal it with a "jumper" inside your meter box... you get charged by how much electricity goes through your meter... once its through your meter your charged for it... IF this plug and save thing does as like a "collector" of electricity from spikes, as was said, unless you have a shit load of electrical spikes in your area, then it really wont help... but i only pay 4 cents KwHr so it doesnt matter to me.. my bill is less than the $150 model typically anyways so its not for me.. maybe someone out there.. but not me...
going back to this jumper thing... have you heard of them or know what they are?? a little lesson if you dont... i learned of them from a good friend of mine, damn near a brother, who is an electrician.. he shows me this small metal thing that was prolly 1/2 inch wide, 1/8 inch thick, and each end of it was bent upwards... it goes in your meter.. one spot hits connects before the electricity passes the actual part that reads the electricity and the other part connects right after wards.. this creates a path for electricity to "jump" around the part that reads the actual usage... actual 50% of your electricity will jump around it... so your meter is only readin half of what its actually using... pretty cool right?? only a couple problems with them... first problem is they are hard to find.. its not something i would try to put together in the garage, so you basically have to find one black market style.. i would check EBAY or google... im sure you can find one that way... second part is you have to break into your meter box to install it... where im live we still have meter readers because the town is small enough they can pay someone to do it... id imagine in a bigger city or in the country these would be ideal... the meters in those kinda places get read by a computer not a person... reason i say this is because if the meter reader or elec company sees a broken "tab" on the meter, opens it up and sees a jumper, well my friend your fucked... not much else to say there... your stealing power for one, then they'll want to know why, which can lead to a much larger problem... anyways... if you do use one of these, and i do know a few growers with a 50 miles radius of me that do with great results, make sure you are safe to use it... make sure your electric company has no reason to go check your meter or your property... but as i said its a sure way to save at least 50% on electricity... they last forever... are removable if you find out your meter is gonna get looked at (youll have to figure out what your excuse is for the seal being broke on your box"... and are pretty cheap...