It’s incredibly frustrating to see a massive spike in your bill when you’ve been careful with your energy consumption, but sometimes it’s just a “catch-up” bill from an estimated reading. I found that calling PSEG customer service first thing in the morning is the best way to bypass the long hold times and speak with a billing specialist who can look at your historical data. They can usually tell you if the charge is based on an actual reading or just a seasonal adjustment, and if there is a mistake, they can issue a credit to your account pretty quickly.