Duke Energy in Charlotte has taught me that power factor penalties are the gift that keeps on giving - for the utility, not the customer! I was auditing a manufacturing facility on Schedule LGS and found what I thought were errors in their demand billing. The calculated demand charges seemed about 20% higher than what the tariff indicated they should be. I spent days analyzing their load data and building a case for $31,000 in overcharges over two years. When I finally called Duke to discuss my findings, they patiently explained that the customer had chronic low power factor issues. The additional charges weren't errors - they were legitimate power factor penalties under the tariff provisions I had completely overlooked. The customer's power factor averaged 0.75 when the tariff required 0.90 or better. Duke actually showed me how to calculate the penalties and it was eye-opening. Now I always check power factor data when it's available and warn clients about potential penalties.
Power factor penalties - the mistake that keeps giving
Derek, Ohio Edison (now FirstEnergy) got me the same way! I was so focused on the base demand rates that I completely missed the power factor adjustment clause. The customer was a metal fabrication shop with lots of inductive loads and their power factor was terrible - around 0.68. I calculated what I thought was a $18K billing error but it was actually justified penalties. FirstEnergy's engineer spent an hour on the phone explaining how power factor affects their distribution system and why they penalize it. It was educational but embarrassing. I learned to always ask about power factor when I see unexplained demand charge variations.
Public Service Company of Oklahoma has some of the strictest power factor requirements I've seen. Their Schedule LPL requires 0.95 power factor or better, and the penalties are steep below that threshold. I had a client whose power factor was running 0.82 and they were getting hammered with additional demand charges. What made it worse was that PSO's billing format doesn't clearly show the power factor penalty as a separate line item - it's rolled into the total demand charge. I initially thought it was a billing error until I manually calculated the penalty and it matched perfectly. The client ended up installing power factor correction equipment to avoid future penalties.
SMUD in Sacramento is pretty reasonable about power factor - they only penalize below 0.85 and the penalties are modest. But I still missed it on my first audit there because their tariff buries the power factor provisions in the general terms section rather than with the rate schedule details. A food processing client was getting small monthly penalties that I initially attributed to meter reading errors. It was only about $800 total over a year, but it taught me that every utility structures these penalties differently. Some are in the rate schedule, some are in general provisions, and some are in separate riders.
NV Energy in Las Vegas has an interesting approach - they offer both penalties for low power factor AND credits for high power factor. I had a casino client whose power factor averaged 0.96 and they were actually getting monthly credits that I initially thought were billing errors in their favor. When I investigated, I found NV Energy rewards customers who maintain excellent power factor because it helps their system efficiency. It was a pleasant surprise for the client and taught me that power factor adjustments aren't always penalties. Some utilities reward good power factor management.
Oncor here in Dallas has power factor penalties that are tied to the specific transformer serving the customer. I had a large retail client whose power factor looked fine on their bills, but they were still getting penalty charges. It took weeks to figure out that Oncor measures power factor at the transformer level, not the individual customer level. If other customers on the same transformer have poor power factor, everyone shares the penalty proportionally. It's a complex system that's nearly impossible to verify without inside knowledge from Oncor. They eventually explained it but it showed me how complicated power factor billing can get with some utilities.