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_17902 ( "Unit" text, "Type" text, "Net power" text, "Total power" text, "Construction start" text, "Construction finish" text, "Commercial operation" text, "Shut down" text )

### Question ###
What's the shut down state of the unit that's been in commercial operation since 01.02.1984?

### Accurate SQL ###

SELECT "Shut down" FROM table_17902 WHERE "Commercial operation" = '01.02.1984'