It would defeat the purpose, which is to provide a place where residents can bathe in sunlight (see cable car mention, where residents can/could take trips to the hilltop for some spot sunbathing) during winter months.

The point is not to light up the village (electricity can do that[0]), it's to provide a sunbeam when the sun does not reach high enough above surrounding hills and mountains to directly light up the valley bottom in winter (actually from september to march).

[0] with ~98% of Norway's electricity being hydro, and norway being a net exporter of electricity, feeding electrical appliances is not a huge issue