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_23840623_4 (clean_electric_grid_california__san_francisco_ VARCHAR, vehicle VARCHAR)
### Question:
How many clean electric grid california (san francisco) figures are given for the Nissan Leaf?
### Answer:
SELECT COUNT(clean_electric_grid_california__san_francisco_) FROM table_23840623_4 WHERE vehicle = "Nissan Leaf"