Below is an context that describes a sql query, paired with an question that provides further information. Write an answer that appropriately completes the request.  # noqa: E501
### Context:
CREATE TABLE table_24620684_2 (clean_electric_grid_california__san_francisco_ VARCHAR, vehicle VARCHAR)
### Question:
When bmw activee is the vehicle type how many clean electric grid california (san francisco) measurements are there?
### Answer:
SELECT COUNT(clean_electric_grid_california__san_francisco_) FROM table_24620684_2 WHERE vehicle = "BMW ActiveE"