Table schema:
CREATE TABLE table_name_12 (average_annual_output__million_kwh_ INTEGER, name VARCHAR, installed_capacity__megawatts_ VARCHAR)

Question: What is the Average annual output for Culligran power station with an Installed capacity less than 19?
SQL: SELECT AVG(average_annual_output__million_kwh_) FROM table_name_12 WHERE name = "culligran" AND installed_capacity__megawatts_ < 19