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_23050383_1 ( kei VARCHAR, economic_incentive_regime VARCHAR )

### Question ###
How many KEI catagories are listed when the economic incentive regime is 2.56?

### Accurate SQL ###

SELECT COUNT(kei) FROM table_23050383_1 WHERE economic_incentive_regime = "2.56"