What is the number of generators where the power capicity is 78.7?
CREATE TABLE table_239 (
    "Power Source" text,
    "Number of Generators" real,
    "Power Capacity (GW)" text,
    "% of total Capacity" text,
    "Capacity factor" text,
    "Annual Energy (billion kWh)" text,
    "% of annual production" text
)
SELECT COUNT("Number of Generators") FROM table_239 WHERE "Power Capacity (GW)" = '78.7'
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 is the number of generators where the power capicity is 78.7? ### Input: CREATE TABLE table_239 (
    "Power Source" text,
    "Number of Generators" real,
    "Power Capacity (GW)" text,
    "% of total Capacity" text,
    "Capacity factor" text,
    "Annual Energy (billion kWh)" text,
    "% of annual production" text
) ### Response: SELECT COUNT("Number of Generators") FROM table_239 WHERE "Power Capacity (GW)" = '78.7'