CREATE TABLE table_name_59 (_percentage_hydropower INTEGER, _percentage_coal VARCHAR(255), _percentage_nuclear_power VARCHAR(255))
what is the highest % hydropower when % coal is 4.9 and % nuclear power is more than 0?
    
SQL: SELECT MAX(_percentage_hydropower) FROM table_name_59 WHERE _percentage_coal = 4.9 AND _percentage_nuclear_power > 0