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_56502 ( "Wind farm" text, "Capacity (MW)" real, "Country" text, "State/Province" text, "Notes" text )

### Question ###
What is the total capacity (MW) of the windfarm located in the state/province of Gansu?

### Accurate SQL ###

SELECT SUM("Capacity (MW)") FROM table_56502 WHERE "State/Province" = 'gansu'