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_19259 ( "AGR Power Station" text, "Net MWe" real, "Construction started" real, "Connected to grid" real, "Commercial operation" real, "Accounting closure date" real )

### Question ###
What year did construction start at Heysham 1

### Accurate SQL ###

SELECT "Construction started" FROM table_19259 WHERE "AGR Power Station" = 'Heysham 1'