Variable Frequency Drives (VFD)

Requirements and Specifications

This measure applies to pumping operations that deliver, distribute or transport irrigation water with VFDs 500 hp or less (see custom project process for pumps exceeding 500 hp). Eligible installations include turbine pumps with substantial variation in flow rates (e.g., 20% or more) or discharge pressure requirements (e.g., 10% or more). This measure provides an annual energy savings of 400 kWh per hp per VFD. New VFD installations must meet IEEE 519 standards.

Please Note: Only turbine pumps will qualify.

Additional Documentation Requirements:

Identification and location address

Pump Type (centrifugal or turbine)

Date of install

Application type (e.g., well or booster)

Operational hours per year

Pre-install billing history for two full seasons prior to install

Post-install billing history for one full season after install

Utility meter number

Pump TDH rating and flow rating (gpm)

Field elevation differences (as a percentage of total dynamic head)

Flow requirements changes (as a percentage of total flow rating)

Acres under irrigation system

Estimated site savings kWh

Name and version of VFD spreadsheet software or model used to estimate kWh savings

Estimated project cost and BPA credit/incentive

Inland Power shall reimburse $50 per installed HP.

Variable Frequency Drives on Small Milking Machines in Dairies (CPN; WTP)

Inland will credit/reimburse $2,200 for verified installations of Variable Frequency Drives (VFD) on milking machines of 10 HP or less. For larger sized machines, a custom proposal with Measurement and Verification (M&V) will still be required.

How to Apply

Fill out the Irrigation Rebate Form in its entirety with attached copy of your invoice and mail to Inland Power & Light, P.O. Box A, Spokane, WA 99219.

Answers to you Rebate Questions