text: 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 (vehicle VARCHAR, clean_electric_grid_california__san_francisco_ VARCHAR)
  ### Question:
  When 100 g/mi (62 g/km) is the clean electric grid california (san francisco) how many vehicles are there?
  ### Answer:
  SELECT COUNT(vehicle) FROM table_24620684_2 WHERE clean_electric_grid_california__san_francisco_ = "100 g/mi (62 g/km)"