what is the least capacity (mw) when the rank is less than 46 and the province is newfoundland and labrador?
CREATE TABLE "largest_generating_stations" (
  "rank" real,
  "name" text,
  "capacity_mw" real,
  "province" text,
  "type" text
);
SELECT MIN("capacity_mw") FROM "largest_generating_stations" WHERE "rank"<46 AND "province"='newfoundland and labrador';