Well don't all laugh at once. I had a power pole replaced back in November 2008. Things were not right and it was affecting audio and especially upsetting the UPS systems.
The reason was this.
As you can see the power I was receiving was distorted and clipped. The THD was well outside the limits allowed by law.
So I had a new power pole installed. Did wonders for the system! There were no problems after that the wave form was perfect. But because of having to cut down trees on our drive way I paid for the line to be buried and that required a new transformer yet again. But I never had a problem again with a distorted AC wave from the power company.
I made sure they used a big enough transformer though.