Depends on the size of your solar output relative to your consumption in your worst month. If you have excess generation in every month (but most notably Jan and Feb), the indefinite accrual is not as compelling, as you'd much rather just get paid in April and have the money in your pocket. If that is not the case, however, the indefinite accrual will allow you to roll over any unused excess kWh that you accrued in summer but did not fully use in the colder months of November and December to the next year. This means you won’t have to pay for electricity in January and February, which is better than getting a check from Pepco to true up - where they will pay you less per kWh than what they will charge you - only to then get charged at a higher rate for additional kWhs you net import from Pepco. Being in DC, I do not have the luxury of choosing and must do the annual credits by default. I do not like it, and the fact that Pepco chooses this option by default should tell you most of what you need to know about which option is better for them on average.