Working on a client here in Dallas with a 12kW rooftop system installed last year. Oncor's net metering reconciliation statement is showing credit at avoided cost rate ($0.045/kWh) instead of retail rate ($0.11/kWh) for excess generation. Client generated 1,850 kWh more than they used over the 12-month period. That's a $120 difference in credits they should have received. Anyone else seeing Oncor mess up the net metering calculations? The tariff clearly states excess should be credited at retail rate for systems under 25kW.
Oncor net metering reconciliation showing wrong credits
Marcus, I've seen similar issues with PG&E here in Sacramento but not exactly the same. Are you looking at Schedule NEM-1 or NEM-2? The crediting methodology changed and some utilities are applying the wrong schedule retroactively. Also check if they're properly accounting for the time-of-use differentials if your client is on a TOU rate.
We've had good success challenging APS on similar net metering errors here in Phoenix. The key is demanding they show their calculation methodology in writing. Most utilities are sloppy with the monthly true-up calculations and don't properly carry forward credits. Make sure they're not applying standby charges that shouldn't apply to residential systems under 10kW either.
Jennifer, this is NEM-1 equivalent but Oncor calls it their Distributed Renewable Generation tariff. Sarah, good point on the standby charges - I need to double-check that. The client is residential but the system is 12kW so right at that threshold where some utilities start adding fees. I'm going to request a detailed calculation worksheet from Oncor.
Up here with PSE, we see errors when they don't properly reset the net metering meter after the annual true-up. The meter keeps accumulating credits but they don't apply them correctly to the next billing cycle. Also watch for seasonal rate changes that affect the credit value - some utilities calculate the annual true-up using blended rates instead of actual monthly rates.
Marcus, I'd also verify the production meter readings match what the inverter monitoring system shows. Sometimes there's a discrepancy between the utility's meter and the customer's monitoring system. Had a case with OG&E where their meter was reading 8% low due to a calibration issue. That adds up over a full year of production.
Great suggestions everyone. Ed T, I'll definitely cross-check the meter readings. The SolarEdge monitoring system shows 14,280 kWh generated for the year but need to see what Oncor recorded. Filing a formal complaint with the Texas PUC if they don't correct this voluntarily. This kind of systematic error probably affects hundreds of their net metering customers.
Keep us posted on the outcome Marcus. Tennessee is just starting to see more solar installations and TVA's Green Power Providers program has similar crediting issues. Documentation is key - print out everything and keep detailed records of all communications with the utility. These cases set precedent for other customers.