CREATE TABLE table_56498 ("Wind farm" TEXT, "Capacity  ( MW ) " FLOAT, "Country" TEXT, "State/Province" TEXT, "Notes" TEXT)

What is the total capacity (MW) of the farm that is noted as being under construction?
SELECT COUNT("Capacity (MW)") FROM table_56498 WHERE "Notes" = 'under construction'
SELECT COUNT("Capacity (MW)") FROM "table_56498" WHERE "Notes" = 'under construction'