text: 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"