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_143352_1 (accounting_closure_date INTEGER, agr_power_station VARCHAR)
### Question:
What is the Closure date of Hunterston B
### Answer:
SELECT MIN(accounting_closure_date) FROM table_143352_1 WHERE agr_power_station = "Hunterston B"