Send a check 5 to 7 business days before your payment is due, along with the bill stub from your invoice, to one of the mailing addresses below or by using the business reply envelope enclosed with your invoice.
If your billing address is in one of these states—AL, AZ, AR, CA, CO, ID, IA, KS, LA, MN, MS, MO, MT, NE, NV, NM, ND, OK, SD, TN, TX, UT, WA, or WY—use this address:
NRG
P.O. Box 660749
Dallas, TX 75266
If your billing address is not in a state listed above, use this address:
NRG
P.O. Box 70220
Philadelphia, PA 19176-0220