Based on what I could find, this appears to be owned and operated by Fortis BC, not BC Hydro. Fortis BC lists a Duck lake substation 

Unless new evidence is provided that indicates otherwise, this can likely be resolved as a FortisBC substation.

For reference, see FortisBC’s transmission system map:
https://www.cdn.fortisbc.com/libraries/docs/default-source/about-us-documents/rfeoi-electric-transmission-system-map.pdf?sfvrsn=d3e9a6af_1