Had a breakthrough on a APS case this week. The meter nameplate shows 600:5 but the billing system has 100:5. Compared the interval data against the bill and found demand values that exceed physical capacity.
Transformer losses — primary vs secondary metering
I disagree with the approach of going straight to the PUC. Try the utility''s escalation process first — it''s faster.
Had the exact same problem with Avista last year. Took about 12 months to resolve but got full refund.
Nice find. I''ve started using a custom Excel template to cross-reference these calculations and it saves a ton of time.