CREATE TABLE table_11456251_5 (_percentage_of_total_capacity VARCHAR2, number_of_generators VARCHAR2)

What is the % of total capacity when the generators is 4048?
SELECT _percentage_of_total_capacity FROM table_11456251_5 WHERE number_of_generators = 4048
SELECT "_percentage_of_total_capacity" FROM "table_11456251_5" WHERE "number_of_generators" = 4048