What year did construction start at Heysham 1
CREATE TABLE table_143352_1 (construction_started VARCHAR, agr_power_station VARCHAR)
SELECT construction_started FROM table_143352_1 WHERE agr_power_station = "Heysham 1"
<s>[INST] Write mssql query to answer the following question given the database schema. Schema: CREATE TABLE table_143352_1 (construction_started VARCHAR, agr_power_station VARCHAR) Question: What year did construction start at Heysham 1 [/INST] SELECT construction_started FROM table_143352_1 WHERE agr_power_station = "Heysham 1" </s>