A negative energy bill means you’ve accumulated more credits than charges, and the extra balance rolls over to the next month.
For Base customers, this could happen due to:
Early Termination Fee (ETF) Credit – If Base covered up to $250 of your ETF from a previous provider.
Referral Rewards – If you’ve earned credits through Base’s referral program.
Solar Buybacks – If your solar system generated more energy than you consumed, and the credits exceeded your bill.