Holy cow, guys. Just found a CT ratio error at a paper mill that's been running for EIGHT YEARS. Georgia Power had them set up as 200:1 when the actual installation was 400:1. Client was being billed for double their actual consumption. We're talking about $47,000 per month in overcharges. Anyone dealt with Georgia Power on something this big?
Massive CT Ratio Error - Georgia Power
Rosa - that's huge! GP can be tough on the really big stuff but they've been fair in my experience. Document everything - photos of the actual CTs, nameplate data, installation records if you can get them. The 8-year lookback might be tricky depending on their tariff language, but you should be able to get at least 3-4 years back.
Ed's right about documentation. I had a similar case with GP in 2010 - not quite as big as yours but still substantial. They credited back 42 months once we proved the error was on their side. Make sure you have someone from their meter shop verify the CT installation in writing.
Thanks! Already got their meter tech out there yesterday and he confirmed the 400:1 setup. Now we're just waiting for the formal verification letter. Client is obviously thrilled - this could be a $350K+ recovery. Will update when we get the final resolution.
Rosa, that's an excellent catch! These CT ratio errors are exactly why thorough field verification is so critical on industrial accounts. For the group - remember that CTs can be changed during maintenance without proper documentation updates. Always verify the physical installation against the billing records, especially on accounts that have been stable for years.