Dealing with a unique situation here in Anchorage with Chugach Electric. Have a client whose interval data shows dramatic demand spikes during extreme cold snaps (below -20°F), but their actual equipment logs don't show corresponding load increases. The meter is installed outdoors and I'm wondering if the extreme cold is affecting the CT accuracy or the electronic components. Anyone dealt with temperature-related meter accuracy issues? This is impacting about $2,000/month in demand charges during winter months.
Chugach Electric interval data in Alaska - extreme cold affecting meter accuracy?
Darren, that's a fascinating issue I haven't encountered in Boise, but it makes sense. Electronic meters definitely have temperature operating ranges, and CTs can be affected by extreme cold. I'd request the meter's temperature compensation specifications from Chugach. Most modern meters have internal temperature sensors and should compensate, but older installations might not. Also check if the meter enclosure has adequate insulation and heating elements.
This is really interesting from a technical standpoint. In Illinois, our coldest weather is nothing compared to Alaska, but I have seen CT accuracy drift in extreme conditions. The key question is whether Chugach Electric has proper temperature correction factors programmed into their billing system. I'd also want to see if other customers in your area are experiencing similar issues during cold snaps.
Darren, this is a unique technical challenge that highlights the importance of understanding environmental factors in meter accuracy. I'd recommend documenting the correlation between temperature data and the demand spikes, then presenting that analysis to Chugach Electric. If there's a systematic temperature-related error, they need to either relocate the meter, upgrade the installation, or apply temperature correction factors. The $2,000/month impact justifies a thorough investigation.
Update on this situation - Randy's suggestion to document the temperature correlation was spot-on. I created a chart showing the exact relationship between outdoor temperature and these phantom demand spikes. Presented it to Chugach Electric and they admitted this meter installation doesn't have proper cold weather protection. They're upgrading the installation with a heated enclosure and will recalculate bills back to October. Estimated recovery is about $8,000. Thanks for the technical insights everyone!
Darren, great resolution on this case! Here in Syracuse, we deal with cold weather but nothing like Alaska. Your documentation approach is something I'll remember for any temperature-related accuracy issues. The $8,000 recovery shows that even unusual technical problems can have significant financial impacts. This case study should be shared with other auditors working in extreme climate areas.