Energy credits don't sit in your bank forever. Once a year, on your "Anniversary True-up" date, PSEG reconciles your account.
: If you have a remaining credit balance after 12 months, PSEG "buys back" those credits.
: Your monthly bill only reflects the "net" difference. If you exported 500 kWh and used 400 kWh, you pay only the fixed customer charges (typically around $0.40/day) and bank the remaining 100 kWh. The Anniversary "True-Up"