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_name_15 (expected_completion VARCHAR, capacity VARCHAR)

### Question ###
What is the year of expected completion when the capacity is 22,500?

### Accurate SQL ###

SELECT expected_completion FROM table_name_15 WHERE capacity = "22,500"