CREATE TABLE table_68270 ("Unit" CLOB, "Type" CLOB, "Gross MW" CLOB, "Construction start" CLOB, "Operation start" CLOB)

Gross MW of 220, and a Unit of kakrapar 1 involves what operation start?
SELECT "Operation start" FROM table_68270 WHERE "Gross MW" = '220' AND "Unit" = 'kakrapar 1'
SELECT "Operation start" FROM "table_68270" WHERE "Gross MW" = '220' AND "Unit" = 'kakrapar 1'