CREATE TABLE nuclear_power_plants (id TEXT, name TEXT, latitude TEXT, longitude TEXT, country TEXT, status TEXT, reactortype TEXT, reactormodel TEXT, constructionstartat TEXT, operationalfrom TEXT, operationalto TEXT, capacity TEXT, lastupdatedat TEXT, source TEXT)

Which country lead the total capacity of the power plants it held?
SELECT country FROM nuclear_power_plants GROUP BY country ORDER BY SUM(capacity) DESC LIMIT 1
SELECT "country" FROM "nuclear_power_plants" GROUP BY "country" ORDER BY SUM("capacity") DESC NULLS LAST LIMIT 1