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_name_59 (_percentage_hydropower INTEGER, _percentage_coal VARCHAR, _percentage_nuclear_power VARCHAR)

### Question ###
what is the highest % hydropower when % coal is 4.9 and % nuclear power is more than 0?

### Accurate SQL ###

SELECT MAX(_percentage_hydropower) FROM table_name_59 WHERE _percentage_coal = 4.9 AND _percentage_nuclear_power > 0