Got a ComEd bill for my client with solar that shows -847 kWh usage and a credit of $98.15. The customer is panicking thinking something is wrong. Anyone else seeing these negative usage readings on ComEd net metering accounts? The rate schedule shows NM-1 but I want to make sure this is calculating correctly. Client has a 6.2kW system installed in May.
ComEd Net Metering Bill Shows Negative Usage - Client Confused
Yuri, that's totally normal for summer months with good solar production. ComEd's NM-1 tariff allows for net excess generation to roll over as a credit. The negative kWh just means they produced more than they consumed. I've seen clients in Cleveland with similar systems hit -1200 kWh in July. Your client should be thrilled, not worried!
Frank is right. In Connecticut we see this all the time with Eversource solar customers. The key is making sure they understand the annual reconciliation process. Those summer credits help offset winter usage when solar production drops. Just explain that negative usage = money in their pocket.
One thing to watch for - make sure ComEd is applying the correct retail rate to the excess generation credit. I caught them using a wholesale rate instead of retail on a Youngstown client who moved to ComEd territory. Cost the customer about $45 per month in lost credits.
Thanks everyone! Jim, that's a great point about the rate verification. I'll double-check the credit calculation. The customer feels much better now knowing this is expected behavior. Going to use this as a teaching moment for my other solar clients.
Yuri, also make sure your client saves those summer credit bills. During the annual true-up, ComEd should apply all accumulated credits against any winter deficit. I keep a spreadsheet for my Milwaukee solar clients tracking monthly net generation. Helps catch errors early.
Down here in Missouri with Ameren, we see similar patterns but their net metering tariff has some quirks. They only credit excess at avoided cost rate, not retail. Makes a big difference in the economics. Sounds like your ComEd client has a much better deal.
Elmer brings up a good point about rate structures. Linda here - Wisconsin has full retail net metering too, but there's talk of changing it. These policies can shift quickly, so always good to document the current terms for clients who are considering solar investments.