Apparently. they're doing another season:
‘Top of the Lake’ Season 2 Confirmed With Elisabeth Moss, Gwendoline Christie
http://variety.com/2016/tv/news/top-...ie-1201735728/
Elisabeth Moss is returning for a second season of “Top of the Lake” for SundanceTV and BBC Two. The “Mad Men” alum will be joined in Season 2 by new cast member Gwendoline Christie of “Game of Thrones” and “Star War: The Force Awakens.”
Jane Campion will return to direct Season 2 of the crime mystery drama, joined by co-director Ariel Kleiman. Campion is co-writing the new season with Gerard Lee.
Season 2 will premiere first on BBC Two in the U.K. in 2017, then later in the year in the U.S. on SundanceTV. Episodes in the U.S. will be featured on Hulu the day after they premiere on SundanceTV.