According to the Montana Fishing Film Festival, this movie was made by Travis Bradford. Entitled "The Montana Warmwater Project", it looks like one we can't wait to see (although 2016 dates for the Festival don't seem readily available).
I've only seen the Northern Lights in Montana ONCE in all the time I've lived here. Stefan Tarzan (we're not quite sure who he is!) captured a STUNNING time lapse in Livingston, Montana this past year.