Requires BPU to prohibit electric and gas public utilities from charging residential customers certain types of payments based on certain billing practices.

S 4479 requires New Jersey's Board of Public Utilities to prohibit electric and gas companies from charging residential customers extra fees when their actual energy use exceeds estimates under equal payment plans (which average yearly usage into monthly bills). It also bans companies from billing customers for the difference between estimated and actual usage (a practice known as underbilling) and prevents them from adding unpaid balances from such differences to future bills. Utilities must adjust monthly payments only once a year, based solely on a customer's actual energy use, rather than making mid-year changes. This bill aims to create more predictable and stable billing for New Jersey households.