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_70004 ( "Unit" text, "Reactortype" text, "Net capacity" text, "Gross capacity" text, "Construction started" text, "Electricity Grid" text, "Commercial Operation" text, "Shutdown" text )

### Question ###
When did the Electricity Grid 28.12.1972 officially shutdown?

### Accurate SQL ###

SELECT "Shutdown" FROM table_70004 WHERE "Electricity Grid" = '28.12.1972'