Below is the list of tables from the database along with their columns and datatype. Need to generate an accurate SQL query for the question.
Only use the columns present in the respective table. Only use the columns which are required to generate the SQL query. Only use table joins if required and not otherwise.

### Tables ###
TABLE: CREATE TABLE table_18911 ( "Cost" text, "2400 kWh/kWp\u2022y" text, "2200 kWh/kWp\u2022y" text, "2000 kWh/kWp\u2022y" text, "1800 kWh/kWp\u2022y" text, "1600 kWh/kWp\u2022y" text, "1400 kWh/kWp\u2022y" text, "1200 kWh/kWp\u2022y" text, "1000 kWh/kWp\u2022y" text, "800 kWh/kWp\u2022y" text )

### Question ###
At the rate where 2200 kwh/kwp y is 11.8, what is the value of 2400 kwh/kwp y?

### Accurate SQL ###

SELECT "2400 kWh/kWp\u2022y" FROM table_18911 WHERE "2200 kWh/kWp\u2022y" = '11.8'