Central Maine Power client (paper mill) has delivery service adjustment showing negative $127.83/month since January. This looks like a credit but I'm not sure what it's for. PUC Docket 2021-00303 mentions stranded cost recovery but this seems backwards.
CMP delivery service adjustment - Maine manufacturing
Diana - Maine has stranded cost true-ups that can result in credits. If CMP over-collected in prior periods, customers get refunds. The negative amount means your client is getting money back.
We see this with SDG&E in California. Stranded cost adjustments reconcile annually. Sometimes utilities over-estimate costs and have to refund the difference.
That makes sense. The credits total about $765 over 6 months. Client is happy to get money back instead of owing more.
Similar situation with Mississippi Power after they retired some generating units early. Stranded cost riders went negative for 8 months.
Credits are nice but make sure you understand what they're for. Sometimes utilities give credits one year and increase rates the next to recover the shortfall.