Table schema:
CREATE TABLE table_25479607_3 (fixed_charge___rs__kwh_ VARCHAR, unit__kwh__time_range VARCHAR)

Question: What is the fixed charge for the user with a unit/time range of i-2: peak (18:30-22:30)?
SQL: SELECT fixed_charge___rs__kwh_ FROM table_25479607_3 WHERE unit__kwh__time_range = "I-2: Peak (18:30-22:30)"