Working on an audit for a manufacturing plant here in Harrisburg that takes primary service from PPL at 13.2kV. They own three pad-mount transformers stepping down to 480V. PPL is trying to charge them for transformer inspections and oil testing, claiming it's required for primary service customers. The client says they've been doing their own maintenance for 15 years. What's the standard practice here? The additional charges would be about $8,000 annually.
Customer-owned transformer maintenance - who's responsible for what?
Alabama Power has similar requirements down here. If you want to maintain primary service classification on Schedule LPP, customer-owned transformers have to meet NEMA standards and pass annual inspections. But the customer can hire their own qualified contractor - doesn't have to be the utility. We saved one client $12,000 per year by switching to a private testing company instead of using Alabama Power's service.
Duke Energy Ohio requires annual testing but allows customer choice of testing company. The key is making sure whoever you hire is certified and provides documentation that meets utility standards. We use a local electrical contractor who charges $500 per transformer versus Duke's $2,800. Just make sure the testing covers dissolved gas analysis, power factor, and insulation resistance.
OG&E here in Oklahoma has backed off most of these requirements after we challenged them at the Corporation Commission. They were trying to require monthly inspections on customer-owned transformers, which was ridiculous. Now they only require testing if there's a failure or safety concern. The commission ruled that customers have the right to maintain their own equipment as long as it doesn's pose a safety risk to utility workers.
That's interesting about OG&E. PPL is claiming their requirements are mandated by PUC safety regulations, but I'm not finding anything specific in the Pennsylvania code. Sounds like we need to dig deeper into what's actually required versus what's just utility preference. The client has perfect maintenance records and no safety incidents in 15 years.
Idaho Power tried the same thing with one of our Boise clients. Turned out their 'requirements' weren't in the approved tariff, just in an internal policy manual. Once we pointed that out, they dropped the mandatory utility testing. Customer can still get primary rates on Schedule 19 as long as they maintain proper insurance and provide annual certification that equipment meets safety standards. Much cheaper than paying for utility testing.