CREATE TABLE table_name_87 (size__mw_ VARCHAR, county VARCHAR, turbines VARCHAR, turbine_vendor VARCHAR)
What is the size of the windfarm in wexford that has more than 19 turbines and a vendor of Enercon?
SELECT size__mw_ FROM table_name_87 WHERE turbines > 19 AND turbine_vendor = "enercon" AND county = "wexford"