Service Quantity Proration

When a bill calculation line is generated for a service quantity type calculation rule, the applicable service quantity is multiplied by the consumption period factor. That product is then multiplied by the calculation period factor to determine the prorated service quantity for the bill calculation line.

Example:

Customer's electricity bill segment's consumption period is from April 1 through May 15. A new rate version for the rate schedule is effective as of April 16. 100 kWh is consumed.

Assuming a monthly frequency, if the consumption period spans 45 days and the first calculation period spans 15 days, and the applicable service quantity is 100 kWh; then:

• Consumption period factor = 30 normal days / 45 days = 0.6666667.
• Calculation period factor = 15 days / 30 normal days = 0.5.
• Prorated service quantity = 100 kWh x 0.6666667 x 0.5 = 33 kWh.

The next calculation period extends to the end of the consumption period (30 days):

• Consumption period factor does not change = 0.6666667.
• Calculation period factor = 30 days / 30 days = 1.0.
• Prorated service quantity = 100 kWh x 0.6666667 x 1.0 = 67 kWh.