hey johe,
not wanting to rain on your parade and all that but I think you are really going to struggle to do powerline with 400 hours, unless you are v.lucky.
I think you should be concentrating on VFR charter, or flight instruction (if you have an FI rating) to try to build your hours up a bit. I think even pipeline patrol would be hard to get.
the ops manual of the last onshore operator I worked for specified 1000 P1 desirable for all its commercial pilots, thats not to say you wont prove me wrong though.
good luck