green energy study for british columbia phase 2 mainland small hydro october 2002 prepared bc by sigma engineering ltd 1444 alberni street 4th floor vancouver canada v6g 2z4 tel 604 688 8271 fax 1286 i table of contents executive summary 1 site locations general intake water conduit powerhouse 3 tailrace substation and powerlines output 4 costs 6 associated issues challenges 8 environmental 9 permitting fish flow releases wildlife 10 vegetation dams noise construction 11 development challenge technology electricity markets 12 financing power contracts interconnection 13 social land use community values first nations operating regimes 14 ii 5 latest systems opportunities outlook 15 overview hydropower clusters 16 attachments figures tables appendix a criteria