I get asked about my audit process constantly so I'm posting it here as a reference. This is the checklist I follow on every commercial electric account.
1. Verify rate schedule eligibility against tariff criteria
2. Check demand charges — billing demand vs actual demand, ratchet calculation
3. Verify power factor — threshold, penalty formula, metered PF value
4. Check tax exemption status — sales tax, gross receipts tax
5. Verify franchise fee percentage against city ordinance
6. Check all riders — correct customer class rate for each rider
7. Verify meter multiplier/CT ratio against meter configuration
8. Check billing period proration on short or long periods
9. Review estimated reads vs actual reads
10. Compare current rate to alternative rates that may be cheaper
11. Check for TOU eligibility if load profile supports it
12. Verify all charges against tariff line by line
Steps 1-3 catch about 70% of the errors I find. Steps 4-6 catch another 20%. Steps 7-12 catch the remaining 10%. But that last 10% often includes the biggest dollar findings.
1. Verify rate schedule eligibility against tariff criteria
2. Check demand charges — billing demand vs actual demand, ratchet calculation
3. Verify power factor — threshold, penalty formula, metered PF value
4. Check tax exemption status — sales tax, gross receipts tax
5. Verify franchise fee percentage against city ordinance
6. Check all riders — correct customer class rate for each rider
7. Verify meter multiplier/CT ratio against meter configuration
8. Check billing period proration on short or long periods
9. Review estimated reads vs actual reads
10. Compare current rate to alternative rates that may be cheaper
11. Check for TOU eligibility if load profile supports it
12. Verify all charges against tariff line by line
Steps 1-3 catch about 70% of the errors I find. Steps 4-6 catch another 20%. Steps 7-12 catch the remaining 10%. But that last 10% often includes the biggest dollar findings.