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Page 3 - 2022 Norris Irrigation Newsletter
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``````Billing Demand Adjustments for Power Factor Measurements Less than 93%
All irrigation services, with a maximum kilowatt demand reading of 15 kW or greater for any 15-minute period between fall billings, will be subject to a billing demand adjustment when the power factor measured during the billing demand period is less than 93%. The billing demand for the service will be increased by the percentage that the customer’s power factor measured during the billing demand period is below 93%, with the maximum increase in billing demand being limited to 10%. The adjusted billing demand is calculated by multiplying
the recorded billing demand by 93% and dividing by the recorded power factor measured during the billing demand period.
In summary, if your kW demand is 15 kW or greater and the power factor printed on your 2020 or 2021 fall bill is below 93% (.93), a functioning power factor correction capacitor may need to be installed by the 2022 irrigation season to correct power factor to .93 or greater in order to avoid a power factor adjustment to the billing demand.
The following is an example of how a power factor of .871 would increase the 2022 annual demand charges by \$82.35 for a service with a kW demand of 51.09 billed on Rate Schedule 13 – Anytime Interruptible.
PF >=.93 OR PF < .93
kW Demand
51.09 51.09
Required Power Factor
0.93
Power Factor
.871
54.55
×
Annual Demand Charge Per kW
\$23.80
=
Annual Demand Charge
\$1,215.94
\$1,298.29 \$ 82.35
×
47.51
÷
×
=
=
\$23.80
=
Annual Demand Charge per kW
Rate Schedule 10 Rate Schedule 13 Rate Schedule 14
\$73.70 \$23.80 \$40.00
Using the information from your 2020 or 2021 fall bill, you can calculate the projected 2022 power factor adjustment using the following formula. If your power factor is .846 or less, enter .846 as the power factor in the formula to limit the power factor adjustment to 10%.
PF >=.93 OR PF < .93
×
=
\$ \$
kW Demand
______
______
Required Power Factor
0.93
Power Factor
._____
Annual Demand Charge Per kW
\$______
Annual Demand Charge
×
÷
_______ ×
=
=
\$______
=
_____
Power factor is the ratio between the useful (true) power (kW) to the total (apparent) power (kVA) consumed by a piece of electrical equipment. It
converted into useful power.
Beginning January 1, 2022, a Power Factor Adjustment will increase the Demand Charge if the power factor is not corrected to a minimum of
93% (.93) on irrigation services with demands of 15 kW or greater.
To easily calculate a potential demand adjustment, a power factor adjustment calculator can be found on the District’s website at https://norrisppd.com/ power-factor-adjustment-calculator/.
If you choose to improve your power factor to the minimum of 93% to avoid the Power Factor Adjustment on future billings, a power factor correction capacitor may need to be installed prior to the 2022 irrigation season.

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