It used to be shown on PBS in the 80's haven't seen it since !

I was about 1 or 2 years old when Powerhouse was aired. I actually have very vague memories of watching it with my older brother who was really into it. Here are some links you might like..

An Unofficial Page
http://pages.prodigy.net/mbgels/index.html

This is a link to the company who produced the show. Click on the "Productions" link and scroll down. You will find a little Powerhouse section where you can watch the opening. It also says something about information on obtaining the series.
http://www.efcvideo.com/Pages/Frameset.html