Just wrapped up a 3-year audit at a paper mill served by Ameren Missouri on their Schedule LGS tariff. Found they were being billed with 400:1 CTs when the actual installation was 200:1 - massive double billing on demand charges. Recovered $47,200 for the client going back 36 months. Anyone else seeing CT ratio errors this blatant lately?
CT Ratio Error at Paper Mill - $47K Recovery
Nice find Eugene! I had a similar case last year with a steel foundry on ComEd's HEP rate. Their 800:1 CTs were reading as 1600:1 in the billing system for almost 2 years. The demand charges were killing them at $18/kW. Always worth checking the meter test reports against what's on the bill.
CT errors are gold mines when you find them. Had one at an auto parts plant where they installed new 300:1 CTs but never updated the billing multiplier from the old 150:1. Took 8 months to get Duke Energy to admit the error but we got $28K back.
Eugene, did you have to provide any documentation beyond the meter test records? I'm working a similar case with AEP and they're asking for installation photos and engineering drawings. Seems excessive for what should be a straightforward multiplier correction.
Steve - Ameren actually made it pretty easy once I provided the original CT installation work order and the most recent meter test. They acknowledged the error within 3 weeks and cut the refund check. Your AEP case sounds more complicated than it needs to be.