Below is an context that describes a sql query, paired with an question that provides further information. Write an answer that appropriately completes the request.  # noqa: E501
### Context:
CREATE TABLE table_24837750_1 (turbine_manufacturer VARCHAR, installed_capacity__mw_ VARCHAR)
### Question:
How many turbine manufacturers installed a capacity of 189 MW?
### Answer:
SELECT COUNT(turbine_manufacturer) FROM table_24837750_1 WHERE installed_capacity__mw_ = "189"