Ameren Missouri is trying to backbill a manufacturing client 6 years claiming the 4-year statute of limitations under RSMo 393.140 doesn't start running until they "discovered" the meter error. This is a $180,000 demand billing issue where the multiplier was set wrong from installation in 2007. Ameren says they only discovered it during a 2013 audit, so the clock started in 2013, not 2007. Has anyone dealt with utilities trying to use discovery rules to extend backbilling periods?
Missouri 4-year limit vs Ameren's "discovery rule" argument
Elmer, that's a new one on me. In Texas, the 3-year limit runs from when the billing error occurred, not when it was discovered. The utilities can't claim ignorance of their own equipment settings. If Ameren installed the meter with wrong multiplier, that's when the error happened. Their internal audit schedule shouldn't affect customer liability periods.
This discovery rule argument is dangerous precedent. In North Carolina, Duke tried something similar claiming they only "discovered" a CT ratio error during AMI installation. We argued that regular meter reading should have revealed billing inconsistencies years earlier. If utilities can reset the clock based on their own investigation timeline, the statutory limits become meaningless.
Idaho Power tried this approach here but the PUC rejected it. They ruled that utility billing statutes protect customers from utility operational failures, including failure to detect their own errors promptly. The limitations period begins when the error occurs, not when the utility gets around to finding it. Discovery rules apply to fraud cases where customers hide wrongdoing, not utility equipment problems.
Warren's right about the fraud distinction. Tennessee courts have been clear that discovery rules only apply when customers actively conceal problems. Utility equipment errors are the utility's responsibility to find through regular maintenance and calibration. If they don't inspect their own meters properly, that's their problem, not grounds to extend customer liability.
Thanks everyone. I'm preparing a response arguing that Ameren had constructive notice of the error from day one. Their own tariff requires regular meter testing and calibration. If they failed to detect the wrong multiplier for 6 years, that's operational negligence, not grounds to restart the limitations clock. The manufacturing client's bills should have shown obvious discrepancies that any competent review would have caught.
Elmer, also check if Missouri has any regulatory precedents on this issue. Arizona Corporation Commission has ruled multiple times that utility billing statutes are strict limitations, not subject to discovery rules. The legislature set these timeframes to provide certainty to customers, not flexibility for utility convenience. Discovery rules would undermine the entire statutory scheme.
Another angle - if Ameren claims they only discovered the error in 2013, what does that say about their billing system oversight? Utilities have sophisticated load analysis tools that should flag unusual consumption patterns. A 6-year billing error suggests systemic quality control failures. That might be grounds for penalty offsets rather than extended recovery periods.
Great point Cecilia. I'm requesting all of Ameren's audit procedures and billing system exception reports. If they have tools to detect anomalies but didn't use them, that strengthens our argument about constructive notice. The manufacturing client's demand profile was completely inconsistent with the billed amounts - any reasonable review should have caught it years ago.
California PUC addressed this exact issue in Decision 08-12-058. They ruled that discovery rules don't apply to utility billing statutes because utilities have superior knowledge of their own systems and billing processes. The limitations period protects customers from utility operational deficiencies. Missouri should follow similar reasoning.
Jennifer, that California decision is perfect precedent! I'm citing it in my response along with the systemic oversight failures. If Ameren wants to argue discovery, they need to explain why their billing quality control failed for 6 consecutive years. This case could set important precedent in Missouri for limiting utility discovery rule arguments.
Keep us posted on the outcome Elmer. This discovery rule trend needs to be stopped before it spreads. If utilities can reset limitation clocks based on their own audit schedules, it completely undermines legislative intent to protect customers. The statutory periods exist precisely because utilities control the information and timing.
Will definitely keep everyone updated. Filed formal objection with Missouri PSC yesterday citing California precedent and arguing systematic utility oversight failure. Ameren's discovery rule theory would essentially give them unlimited backbill authority as long as they claim ignorance of their own equipment problems. That can't be what the legislature intended with the 4-year limit.
This thread perfectly illustrates why we need consistent national standards on backbilling limits. Utilities are clearly coordinating these discovery rule arguments across state lines. The EEI probably has template language they're sharing. We should be just as coordinated in our responses, sharing successful precedents and legal arguments that shut down these overreaches.