@david-scubadiver That’s what I was wondering. Historically the interest was on any amount that was considered “credit” over the previous 12 months.

@zapjb I had a very similar experience the first year. It has definitely leveled out since then.

My local utility (BG&E) allows for a budget payment option that allows for consistent monthly bills. From time to time this results in a credit on the account depending on the time of year. This credit earns 0.5% interest per month, which by my math translates to an 6% APR. Any reason I couldn’t just prepay a large amount and earn that interest? Thoughts?