What commercial operation that has a gross capacity of 1,126 mw, and a unit of tianwan-4?
CREATE TABLE table_14738 (
    "Unit" text,
    "Reactor type" text,
    "Net capacity" text,
    "Gross capacity" text,
    "Construction started" text,
    "Electricity grid" text,
    "Commercial operation" text,
    "Shutdown" text
)
SELECT "Commercial operation" FROM table_14738 WHERE "Gross capacity" = '1,126 mw' AND "Unit" = 'tianwan-4'
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 commercial operation that has a gross capacity of 1,126 mw, and a unit of tianwan-4? ### Input: CREATE TABLE table_14738 (
    "Unit" text,
    "Reactor type" text,
    "Net capacity" text,
    "Gross capacity" text,
    "Construction started" text,
    "Electricity grid" text,
    "Commercial operation" text,
    "Shutdown" text
) ### Response: SELECT "Commercial operation" FROM table_14738 WHERE "Gross capacity" = '1,126 mw' AND "Unit" = 'tianwan-4'