Below is the list of tables from the database along with their columns and datatype. Need to generate an accurate SQL query for the question.
Only use the columns present in the respective table. Only use the columns which are required to generate the SQL query. Only use table joins if required and not otherwise.

### Tables ###
TABLE: CREATE TABLE table_name_44 (operation_start VARCHAR, gross_mw VARCHAR, unit VARCHAR)

### Question ###
Gross MW of 220, and a Unit of kakrapar 1 involves what operation start?

### Accurate SQL ###

SELECT operation_start FROM table_name_44 WHERE gross_mw = "220" AND unit = "kakrapar 1"