CREATE TABLE table_76083 ("Name" TEXT, "Year commissioned" FLOAT, "Gross head  ( metres ) " FLOAT, "Installed capacity  ( megawatts ) " FLOAT, "Average annual output  ( million KWh ) " FLOAT)

What is the Average annual output for Culligran power station with an Installed capacity less than 19?
SELECT AVG("Average annual output (million KWh)") FROM table_76083 WHERE "Name" = 'culligran' AND "Installed capacity (megawatts)" < '19'
SELECT AVG("Average annual output (million KWh)") FROM "table_76083" WHERE "Installed capacity (megawatts)" < '19' AND "Name" = 'culligran'