Calculation Rule Value Proration

Except for summary type calculation rules (which are not prorated at all), a value is specified on the calculation rule. The value may be a unit rate, percentage or charge. The value may be specified directly on the calculation rule, derived from a bill factor, derived from another calculation rule, or calculated by an algorithm.

Regardless of where the calculation rule value comes from, it will be multiplied by the calculation period factor when determining the charge on a bill calculation line. Exceptions to this rule are:

• Unit rate values where the calculation rule's measures peak attribute is not checked.
• Percentage values.
• Calculation rule values derived from another calculation rule.

Even though the calculation rule values are not prorated for unit rate and percentage value types, if these rate values change during the calculation period due to a bill factor value change, bill factor value proration still applies.

Values derived from another calculation rule are not subject to rate value proration, as calculation rule value proration was already performed on the referenced calculation rule. Again, if the bill factor value changed on the referenced calculation rule, bill factor value proration still applies.

Example:

A calculation rule charges $2.00 per kW. The rate schedule's normal days equals 30, and the calculation period spans 15 days. The peak kW service quantity is 50 kW.

• The calculation period factor is 0.5 (15 days / 30 days).
• Calculation rule value proration yields $2.00 x 0.5 = $1.00 per kW.