Just wrapped up an audit at a pharma facility in New Jersey that's been getting hammered on their PSE&G bills. Turns out their 13.2kV service had the wrong CT ratio in the billing system - utility had them at 200:1 when the actual installation was 400:1. They've been getting billed for double their actual usage for almost 4 years. Recovery came to $180,000 plus interest.
Found 400:1 CT ratio error at pharmaceutical plant - $180K recovery
Holy cow Michelle! That's a big one. How did you catch it - was it obvious from the load patterns or did you have to dig into the metering records?
The dead giveaway was their kW demand readings seemed way too high for a facility that size. A 200,000 sq ft pharma plant showing 3,200 kW peak demand raised red flags. I requested the original meter installation records and sure enough, the CTs were 400:1 but PSE&G's billing system showed 200:1 from day one.
This is exactly why I always verify CT ratios on any industrial account over 1MW. PSE&G seems particularly prone to these errors on new service connections. Nice catch!