Coincident kVa billing determinants

With certain tariffs and rate schedules, customers are billed based on their "apparent" demand (kVa) rather than their "active" demand (kW). Apparent demand takes into account the amount of power used to deliver the active demand (kVar), rather than just the amount of usable power delivered. Apparent demand calculations are typically performed only for large commercial or industrial accounts, and therefore are expected to be included on a relatively low volume of billing calculation requests.

IEE enables utilities to calculate billing determinants based on the apparent power delivered (kVa) by the utility to serve the real power peak (kW) of the customer. The resulting billing determinant has a unit of measure (OUM) of the kVa family and the same date and time as the peak demand.

IEE calculates the kVa coincident peak as follows:

  1. Identify the highest peak demand value (kW) within the given kWh channel.

  2. Find the demand value on the related kVarh channel(s) that has the same date and time stamp as the highest peak demand value. The kVa channel set links the kVarh channel to the kWh channel.

  3. Calculate the kVa value using these kW and kVar values

IEE uses the following formulas to calculate the kVa value:

  • Simple: SquareRoot (kW2 + kVar2 )

  • Complex ABS: SquareRoot (kW2 + ABS (kVar Delivered – kVar Received)2 )

  • Complex NET: SquareRoot (kW2 + (kVar Delivered + kVar Received)2 )

If the channel set contains only a single kVar/kVarh channel, IEE uses the simple formula. If the service point channel set contains both delivered and received kVar/kVarh channels, IEE uses one of the complex formulas.