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_27009 ( "Vehicle" text, "Operating mode" text, "EPA rated All-electric range" text, "EPA rated combined fuel economy" text, "Clean electric grid California (San Francisco)" text, "U.S. national average electric mix" text, "Dirty electric grid Rocky Mountains (Denver)" text )

### Question ###
When bmw activee is the vehicle type how many clean electric grid california (san francisco) measurements are there?

### Accurate SQL ###

SELECT COUNT("Clean electric grid California (San Francisco)") FROM table_27009 WHERE "Vehicle" = 'BMW ActiveE'