user: Question: How many turbine manufacturers installed a capacity of 189 MW?
Columns: ['Wind farm', 'Installed capacity (MW)', 'Turbine Manufacturer', 'County', 'Date in Service']
Types: ['text', 'text', 'text', 'text', 'text']
Sample row: ['Glacier Wind Farm I and II (NaturEner)', '210', 'Acciona 1.5MW', 'Glacier/Toole', '2008-2009']
SQL:

assistant: SELECT COUNT("Turbine Manufacturer") FROM "Table" WHERE "Installed capacity (MW)" = '189';