http://www3.gov.ab.ca/hre/whs/public...f/OID_2004.pdf
I don't know if that'll help. The stats for "utilities" don't look all that dangerous.
There are a lot of resources on the internet to learn about occupational health issues, even Alberta specific things. Poke around a bit and you might find some #s or information. I'm sure you can even phone the government or a union about this stuff.