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_name_17 (gross_capacity VARCHAR, commercial_operation VARCHAR)
### Question:
What is the gross capacity of the unit that started commercial operation on August 28, 1987?
### Answer:
SELECT gross_capacity FROM table_name_17 WHERE commercial_operation = "august 28, 1987"