What year did construction start at Heysham 1
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
)
SELECT "Construction started" FROM table_19259 WHERE "AGR Power Station" = 'Heysham 1'
Below are sql tables schemas paired with instruction that describes a task. Using valid SQLite, write a response that appropriately completes the request for the provided tables. ### Instruction: What year did construction start at Heysham 1 ### Input: 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
) ### Response: SELECT "Construction started" FROM table_19259 WHERE "AGR Power Station" = 'Heysham 1'