user: Question: What is the Average annual output for culligran power station with an Installed capacity less than 19?
Columns: ['Name', 'Year commissioned', 'Gross head (metres)', 'Installed capacity (megawatts)', 'Average annual output (million KWh)']
Types: ['text', 'real', 'real', 'real', 'real']
Sample row: ['Deanie', 1963.0, 113.0, 38.0, 92.0]
SQL:

assistant: SELECT "Average annual output (million KWh)" FROM "Table" WHERE "Name" = 'culligran' AND "Installed capacity (megawatts)" < 19.0;