The Upper Lillooet Hydroelectric Facility (HEF) is a run-of-river power generation facility located on crown land approximately 40 km north of Pemberton, British Columbia, in the Sea-to-Sky district.

Owned and operated by Innergex, it has a gross installed capacity of 81. 4 MW and has been in commercial operation since March 2017, selling power to BC Hydro.

The facility is one of two hydroelectric projects comprising the Upper Lillooet River Hydro Project, the other being the nearby Boulder Creek facility (25. 3 MW), for a combined capacity of 106. 7 MW.

A key engineering feature is a tunnel approximately 2,500 m long and 6 m wide by 5. 5 m high, excavated along the Upper Lillooet River Valley.

Construction took place in a mountainous, volcanically active region with strict environmental protocols in place to protect sensitive wildlife, including seasonal work-hour restrictions and shutdown periods tied to snow depth thresholds.