We're auditing a paper mill in Georgia on Georgia Power's Schedule IMD-3. They have 13.8kV service with 800:5 CTs, but I'm finding references to 400:5 in some older invoices from 2015. The demand readings don't add up - showing 2,400 kW actual vs 4,800 kW billed. Anyone dealt with CT ratio changes that weren't properly documented?
Paper mill CT ratio confusion - help!
Ruben, I've seen this exact scenario three times. Georgia Power sometimes upgrades CTs during routine maintenance without updating billing systems immediately. Check the meter test reports - they should show the actual CT ratios in service. If there's a discrepancy, you're looking at massive overbilling.
Laura's right about the test reports. Also request the work orders for any substation maintenance during that timeframe. We recovered $127K for a textile plant in similar situation - 18 months of double-billing due to CT ratio error. Georgia Power was actually pretty cooperative once we showed the documentation.
Thanks Laura and Sylvia! Found the work orders - CTs were indeed changed in March 2015 but billing department wasn't notified until August. That's 5 months of overbilling right there. Calculating now but looks like around $85K recovery potential.
Great detective work everyone. This is exactly why we always request maintenance records for the full audit period. Ruben, make sure to ask for interest on the refund - Georgia Power typically pays from the error date. Document everything and you should have a solid case.