Still kicking myself over this one. Large manufacturing client in Grand Rapids was getting billed fuel adjustment charges based on the wrong fuel price index. Consumers Energy was using natural gas prices from the wrong trading hub - Henry Hub instead of Michigan Consolidated. The difference was about $0.008/kWh which doesn't sound like much but on 2.5 million kWh per month it added up fast. Six months of overcharges totaled $119,000. I had reviewed dozens of bills and never questioned the fuel calculation methodology. Anyone else get burned by fuel clause details?
Fuel adjustment clause nightmare - 6 months of wrong calculations
Tina, that's a tough one because fuel clauses are so complex. NorthWestern Energy here uses a rolling 12-month average with seasonal adjustments and it's nearly impossible to verify without their internal data. I've learned to at least spot-check a few months against published indices but even that doesn't catch everything. Did Consumers admit the error once you pointed it out?
Marilyn - they fought it for three months! Kept insisting their methodology was correct per the tariff. Finally had to get the Michigan PSC involved. Turns out they had been using the wrong index for multiple large customers. The tariff was ambiguous about which specific trading hub to use. They ended up issuing refunds to about 20 accounts totaling over $800K. Made me realize how many billing errors might be systematic rather than one-off mistakes.
Great catch Tina. MLGW here in Memphis has a relatively simple fuel adjustment but I've seen utilities with incredibly convoluted calculations. The key lesson is never assume the utility is calculating complex charges correctly just because they've been doing it for years. I once found Duke Energy in North Carolina was applying the wrong loss factor to fuel charges - small percentage but huge dollars over time. These systematic errors are gold mines if you can find them.
Randy makes a good point about systematic errors. Duke Energy here in Raleigh had a similar issue with environmental compliance charges. They were applying the per-kWh rate to gross usage instead of net usage for customers with on-site generation. Affected about 50 accounts over two years. Sometimes one discovery leads to industry-wide corrections. How do you all stay on top of tariff changes that might create new billing opportunities?
Steve, I try to review PSC filings quarterly but it's overwhelming. PG&E files hundreds of tariff modifications per year. I focus on the major rate schedules my clients use and set up Google alerts for specific terms like "fuel adjustment" and "environmental charge". Still miss stuff though. The Tina's case shows how one detailed review can uncover patterns affecting multiple accounts.
Pete's Google alerts idea is smart. I use a similar approach for Dominion Energy filings in Virginia. The challenge is that utilities often bury significant changes in routine compliance filings. Found a transmission cost recovery adjustment that had been miscalculated for 8 months because the change was embedded in a 47-page environmental compliance report. $200K+ error hiding in plain sight.
Bill, that's exactly what I'm talking about. These utilities process so many tariff changes that errors are inevitable. The fuel clause mistake I found led me to spot-check other complex calculations. Found two more systematic errors in the same utility's portfolio - incorrect loss factors and wrong voltage discounts. Total recovery across all affected accounts was over $2 million. One audit turned into a gold mine.
Tina, did Consumers Energy change their internal procedures after your findings? NorthWestern Energy here implemented additional review steps for fuel calculations after I found a similar error last year. Sometimes these mistakes lead to better utility processes which benefits everyone. Though I have to admit, part of me hopes they keep making errors - it's good for business!
Noel - they supposedly implemented monthly cross-checks of their fuel indices against published prices. But honestly, I doubt it's foolproof. These billing systems are so automated that errors can persist for years before anyone notices. The key is maintaining that healthy skepticism and not assuming complex calculations are correct just because they're consistent month to month.
Tina's point about consistency vs. correctness is crucial. I've seen billing errors that were perfectly consistent for years - wrong, but consistent. The hardest part is convincing clients to pay for detailed analysis of charges that "look normal" on the surface. But as this thread shows, that's often where the biggest recoveries hide. Thanks for sharing this case study, very educational for all of us.
Randy's right about client education. I now lead every audit proposal with examples like Tina's fuel clause discovery. Helps justify the deeper analysis and shows why cookie-cutter audits miss the big money. Complex charges require complex analysis, but that's where the expertise really pays off. Great thread everyone, lots of lessons learned here.