How many turbine manufacturers installed a capacity of 189 MW?
CREATE TABLE table_24837750_1 (turbine_manufacturer VARCHAR, installed_capacity__mw_ VARCHAR)
SELECT COUNT(turbine_manufacturer) FROM table_24837750_1 WHERE installed_capacity__mw_ = "189"
<s>[INST] Write mssql query to answer the following question given the database schema. Schema: CREATE TABLE table_24837750_1 (turbine_manufacturer VARCHAR, installed_capacity__mw_ VARCHAR) Question: How many turbine manufacturers installed a capacity of 189 MW? [/INST] SELECT COUNT(turbine_manufacturer) FROM table_24837750_1 WHERE installed_capacity__mw_ = "189" </s>