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_70003 ( "Unit" text, "Reactortype" text, "Net capacity" text, "Gross capacity" text, "Construction started" text, "Electricity Grid" text, "Commercial Operation" text, "Shutdown" text )

### Question ###
Which Commercial Operation has both a Gross Capacity of 417 mw and an Electricity Grid 27.12.1971?

### Accurate SQL ###

SELECT "Commercial Operation" FROM table_70003 WHERE "Gross capacity" = '417 mw' AND "Electricity Grid" = '27.12.1971'