CREATE TABLE table_203_78 (id DECIMAL, "location" TEXT, "reactor type" TEXT, "status" TEXT, "net\ capacity\ ( mwe ) " DECIMAL, "gross\ capacity\ ( mwe ) " DECIMAL)

which reactor is the only one that is operational until august 2026 ?
SELECT "location" FROM table_203_78 WHERE "status" = 'operational until august 2026'
SELECT "location" FROM "table_203_78" WHERE "status" = 'operational until august 2026'