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Bill Glossary

Find definitions about the charges and terminology on your bill. Click on the letter the term starts with or browse the entire glossary.

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100 Watt Sodium Vapor

This is an outdoor area light. The charge for this light is based on the wattage or size (such as 100, 200 or 400 watt) of the specific light. Schedule 15 in Idaho and Oregon includes different wattages for area lighting and flood lighting. The appropriate lighting type and wattage will be listed on the customer’s bill. The charge will be determined within the rate schedule by wattage.

AAM (Annual Adjustment Mechanism)

The Annual Adjustment Mechanism (AAM) is a combination of several rider charges that are applied to the bill in a per kWh manner. The AAM includes the Power Cost Adjustment (PCA), the Fixed Cost Adjustment (FCA) and can include other charges that are applied in a similar manner.


Your account is identified by a unique 10-digit number assigned by Idaho Power. If you receive service at more than one address, you may have more than one account number. You'll need this number when paying your bill or contacting Idaho Power.

Account Activity

Details the account's previous balance; any payments the company has received since the previous billing; the account's balance forward, if any; the current charges to the account; and the account balance.

Account Balance

The accumulated amount currently billed to the account.

Annual PCA

The Annual PCA is a line item appearing on Oregon customers’ bills. Refer to APCU.

APCU (Annual Power Cost Update)

The Annual Power Cost Update (APCU) consists of two annual filings which become effective for our Oregon customers on June 1 each year. The combined effect of the two filings will adjust rates up or down based on net power supply expenses, including fuel costs, purchased power, and sales for resale. The first component, the annual October Update, allows us to update base rates to reflect current power supply costs, assuming normal or average power generated by our hydroelectric plants. The second component, the March Forecast, allows us to temporarily adjust rates for one year to reflect the anticipated actual costs of supplying power to our customers based on our cost forecast for the coming year. The APCU is identified on customers’ bills as Annual PCA. APCU information can be found under Oregon Tariff Schedule 55.

Average Daily Use Comparison

Compares the average daily electricity usage for the current month with the same month a year ago.

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Balance Forward

The amount left unpaid from your previous bill.

Billing Date

The date your bill was prepared.

Billing kW

The Billing Demand is the average kW supplied during the 15 consecutive minute period of maximum use during the billing period. This number may be adjusted for power factor.

BLC (Basic Load Capacity)

The basic load capacity is calculated primarily for large commercial and industrial customers. It also is used to calculate the Basic Charge on these customers’ bills. The BLC is the average kW used during the two months of greatest electricity demand over the past 12 months, including the current month. It is recalculated each month.

BLC (Basic Load Capacity) Charge

Primarily for large commercial and industrial customers, the BLC charge is calculated each month using the average of the two highest peak demand times (measured in 15-minute periods) for the past year. See also BLC above.

Boardman Operating Life Adjustment

This charge is for Oregon customers only. It's designed to recover the revenue requirement impact of the incremental costs and benefits associated with the early shut down of the Boardman Power Plant.

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BPA Credit

The Residential Exchange Program (REP) was established by the 1980 Northwest Power Act. The program was created to provide residential and small farm customers of Pacific Northwest utilities a form of access to low-cost power from the Federal Columbia River Power System, in the form of credits on their power bills. Idaho and Oregon residential, small farm and irrigation customers qualify to receive this credit. The credit is determined by multiplying the customer’s monthly kilowatt-hour (kwh) usage by the per kwh credit amount that can be found in Tariff Schedule 98 (in both Idaho and Oregon). For residential and small farm customers, the credit amount will be reflected on their monthly bills; for irrigation customers, the credit amount will be issued in December of each year.

Budget Balance

The balance due that month for an account on Budget Pay.

Budget Pay

This plan spreads your electricity charges evenly over a 12-month period. The monthly payment is the average of 12 monthly billings based on historical charges or an estimate of future charges. Learn more about Budget Pay.

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All dollar amounts followed with a CR indicate a credit and are deducted from the total bill amount.

Current Bill

The amount due for energy consumed during the most recent billing period. The Current Bill amount includes all charges for electrical service plus any applicable late fees, franchise fees and any prior unpaid balance.

Current Charges

The current billing amount for electric service. If your account is on Budget Pay, or another payment arrangement, then this amount may be different than the "Please Pay" amount on the tear-off portion of your bill.

Customer Name

The name of the person responsible for the Idaho Power account. If the person receiving service is not the same person as the person responsible for payment of service, the latter is considered the customer for purposes of scheduling service connections or disconnections, receiving funds, or making changes to the account.

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Demand Charge

Reflects the capacity necessary to meet a monthly peak demand used primarily for large commercial and industrial customers. The demand charge is multiplied by the average number of kilowatts used during the 15-minute period of peak demand (highest electricity use) each month. The peak demand is calculated either by the kilowatts shown on the meter, or stated in the demand clause of the customer’s rate schedule.


A deposit is sometimes required when you set up new service, or if your service has been interrupted because we have not received your payment. It is not prepayment of your bill. The deposit payment is held as security for future payment and is reimbursable after good credit is established with Idaho Power.

Due Date

The date by which Idaho Power should receive your payment to avoid any associated late charges. Idaho customers will be assessed a monthly late charge of 1 percent of any unpaid balance.

Energy Charge

An amount equal to the monthly electricity usage (kWh) multiplied by your rate.

Energy Efficiency Services

Energy Efficiency Services provides financial support for Idaho Power’s energy efficiency programs. The charge included in the Energy Efficiency Services is the Energy Efficiency Rider.

Energy Efficiency Rider

Pays for the analysis and implementation of energy efficiency programs. It is included on customers’ monthly bills under the “Energy Efficiency Services” line item and is equal to 4 percent of the monthly base rate billing amount for Idaho customers and 3 percent of the base rate billing amount for Oregon customers. Learn how to conserve energy and save money.

Facility Charge

The amount charged to some industrial customers for Idaho Power equipment located beyond the primary meter.

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Federal Columbia River Benefits Supplied by BPA

Idaho and Oregon irrigation and residential customers may qualify to receive a credit as part of the Federal Columbia River Power System benefits supplied by Bonneville Power Administration (BPA). These benefits, shared among residential and small farm customers, are a result of a five-year settlement Idaho Power Company negotiated with BPA in 2001. The amount is determined using a monthly factor for the Residential BPA Credit, which is then multiplied by the usage and applied to the monthly billing. Irrigation BPA Credits are applied annually in December along with the Irrigation Tax Rebates.

Final Bill

The last bill for service at your location. It can be mailed to any address you request. If you transfer service, the final bill amount will be mailed to the service address of the old location, and listed on the first bill of the new location as a Prior Balance.

Fixed-Cost Adjustment

The Fixed-Cost Adjustment, or FCA, is designed to remove the unintended financial disincentive Idaho Power experiences when electricity sales decrease due to energy efficiency programs. This rate mechanism annually adjusts rates up or down to recover the difference between the fixed costs authorized by the IPUC and the fixed costs the utility actually recovers from customers through energy sales during the previous year. The FCA applies to residential service and small general service customers only. The FCA is identified on customers’ bills as AAM (refer to AAM for more information).

Franchise Fee

Reflects part of the amount Idaho and Oregon cities charge Idaho Power for putting power lines on city property. Idaho Power signs a “franchise” with city governments for this privilege. The fees are collected by Idaho Power and passed directly to the local government entity. The fee may be between 1 and 3 percent of the customer’s bill, depending on applicable government regulations.

Generation Meter

This refers to the meter that records the generation by producers with generating plants (solar, wind, biomass, hydropower or fuel cell) for the purpose of supplying electric power required in their residential, commercial, or industrial operations.


Preceded by a number on irrigation account bills, HP = Horsepower for a specific irrigation pump.

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Interest Applied

The dollar amount accrued on deposits while in possession of Idaho Power. The interest rate is set by the Idaho and Oregon Public Utility commissions annually.


kV = kilovolt. One kilovolt equals 1,000 volts. A volt is the electromotive force or electric pressure similar to water pressure in pounds per square inch.


kW = kilowatt. A unit of measure of the amount of electricity needed to operate given equipment. One kilowatt is equal to 1,000 watts. On a hot summer afternoon a typical home, with central air conditioning and other equipment in use, might have a demand of four kW. The peak load for a typical home might reach nine or 10 kW when several appliances are running at the same time.


kWh = kilowatt-hour, is the unit Idaho Power uses to measure your electricity usage each month. The most commonly-used unit of measure telling the amount of electricity consumed over time. For example, if you operate a 1,000-watt microwave for one hour, or if you operate a 100-watt light bulb for 10 hours, each will use one kilowatt-hour of electricity.

kWh Used

kWh = The amount of kWhs the meter recorded having been used during the billing cycle.

Late Fee or Late Payment Charge

A fee that is equal to 1 percent of the past due balance (amount owed to Idaho Power). It occurs when Idaho Power has not received your payment by the due date.

Megawatt (MW)

One million watts, or 1,000 kilowatts – is enough electricity to light 10,000 light bulbs (100-watts each) or 36,000 energy-efficient compact fluorescent bulbs (28-watts each). Over one year, one MW is enough electricity to meet the average load requirements for about 670 homes. However, during peak times – very hot or cold weather – one MW will power fewer than 300 homes.

Meter Constant

A numeric field found on the front of the meter and used to calculate the number of kilowatts used in your home each month. For example, the constant "Kh=7.2" means that for each revolution of the disk inside your meter, 7.2 kilowatt-hours of electricity have been used. Most residential customers have a meter constant of 1, while larger power customers may have a higher meter constant.

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Meter Number

The identifying number on the front of your meter.

Meter Readings (Previous and Current)

The measuring components of an electric meter are read on a monthly basis to determine the usage amount for billing customers. The previous meter reading amount is what was recorded the month prior; the current amount is for the current month. The previous reading is subtracted from the current reading to determine the kWh used during the current billing cycle.

New Contact Information

If you need to update your contact information with us, including mailing address and phone number, there are details about where to send us that new information on the flip side of the bill stub. Registered myAccount users may also update their information with us online. Click to register or log in.

Next Read Date

The next time the account's meter is scheduled to be read.

Number of Days

The number of days of service included in the billing cycle.

Oregon Solar Investment

This charge is for Oregon customers only. It's designed to recover costs associated with the development of a pilot program for solar photovoltaic energy systems mandated by Oregon House Bill 3690.


The total amount of funds Idaho Power has received from the date of your previous bill to the date the current bill was generated.

Pay Station

Pay Stations allow you to pay your electricity bill in person at stores and businesses in communities throughout the company’s service area. Many Pay Stations offer the convenience of longer business hours and the ability to conduct business on weekends. For faster service, bring a copy of your most recent bill, or your 10-digit Idaho Power account number along with your payment.

PCA (Power Cost Adjustment)

This rate is adjusted for our Idaho customers on June 1 of each year. The PCA passes through to customers costs or benefits associated with the differences in projected power supply expenses compared to normal power supply expenses for the same period (PCA year). This rate may also include the over collection or under collection of power supply costs from the previous PCA year. The PCA is identified on customers’ bills as AAM (refer to AAM for more information). For the “Annual PCA”, as reflected on Oregon bills only, refer to APCU. PCA information can be found under Idaho Schedule 55.

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PCAM (Power Cost Adjustment Mechanism)

The PCAM is the difference between actual net power supply expenses incurred and the net power supply expenses recovered for the preceding January through December period. The PCAM is a deferral account which will be recovered through an Annual Power Supply Expense True-Up rate. PCAM information can be found under Oregon Schedule 56.

Please Pay

The amount owed to Idaho Power for your most current bill. If your account is on Budget Pay, this amount will stay the same each month. If you are not on Budget Pay, this amount will match the Account Balance.


Customers can pay their Idaho Power bill electronically by transferring funds directly from a designated checking or savings account (automatic bank debiting). Learn more about PreferredPay™.

Previous Balance

The amount owed from the last or a previous bill.

Print Date

The day the bill was printed.

Project Share

Idaho Power Company teams up with The Salvation Army year round to help those who cannot pay winter heating bills due to illness, disability, age or unemployment. Project Share helps people pay electric, natural gas, propane, oil or firewood bills. By making a pledge of $2, $5, or $10, for example, you can help someone less fortunate meet the demands of winter heating. The back of your bill stub has a place for you to mark the pledge amount you wish to add to your monthly bill amount.


Any time a change is made to the rate or billing period, the bill is prorated into parts to correspond with the change. For example, if you sign up for service on the 10th of the month, your account will be “prorated,” or charged only for part of that month. Prorated billing also happens if electricity rates change mid-month and Idaho Power needs to calculate part of the month at a different rate.

PSA Charge (Power Supply Adjustment)

This Oregon rate charge recovers past power supply costs that occurred in 2007. This charge will eventually go away once those costs are recovered. This charge does not have a separate rate schedule, but can be found listed under each Oregon rate schedule.

Pwr Fac (or Power Factor)

Reflects the amount of extra work (measured in volt-amperes) needed to provide electricity to some industrial customers. This is always a value between zero and 1.0. Customers with less efficient equipment (which use up more energy than necessary to supply the required watts) will have a power factor lower than 1.0. The power factor is calculated for each customer by dividing the maximum demand (measured in kilowatts) by the kilovolt-ampere (kVa) demand established by the customer.

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Pwr Fac Adj (or Power Factor Adjustment)

When a customer's power factor is less than 90 percent (0.90), as measured under actual load conditions, Idaho Power may adjust the kW demanded that month to reflect the extra volts-amperes generated in order to meet that demand. The adjusted demand is figured by multiplying the measured kW (as shown on the meter) by 90 percent, and dividing by the customer's unique power factor.

Rate Schedule

Identifies your account's rate plan, which determines the rate you are billed. These plans include:

  • I01, I05 or O01 — Residential
  • I07 or O07—Small General Service (Small Commercial)
  • I09, O09 (P, S or T)—Large General Service (Large Commercial)
  • I19, O19 (P, S or T)—Large Power Service (Industrial)
  • I24, O24, I25 (S, SB, C, or CB)—Irrigation Service

Click for a full list of Idaho Power’s rate schedules and an explanation of each schedule’s regulations.

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Reading Type

Identifies how the meter read was made. Different reading types include:

  • Actual: Usage is determined by an Idaho Power meter service specialist reading the meter in person at your service address.

  • Estimated: Usage is determined by your past energy use or the past usage history of your location. This may be done when your meter cannot be located or accessed.

  • Adjusted: Usage is determined by an actual reading in person performed after an estimated read to make sure the estimated read was accurate. The adjusted read may occur close to the time of the estimated read, or it may occur at the next month's regular meter read date.

Seasonal Rates

Rates for all customer groups change between summer and non-summer seasons. The summer season begins on June 1 each year and ends Aug. 31. The non-summer season begins Sept. 1 and ends May 31. Irrigation customers pay “in-season” and “out-of-season” rates instead of summer and non-summer. The irrigation season begins with the May meter read cycle date and ends as of the September meter read cycle date. For Irrigation customers the season begins June 1 and ends Sept. 30, inclusive.

Service Agreement No.

A Service Agreement No. (or Number) is an identification number for service at a particular location. It serves as an 'implied contract' that contains the terms and conditions by which Idaho Power provides service to a customer and by which the customer agrees to compensate the company.

Service Charge

The service charge is a flat fee that helps recover costs involved with maintaining meters, lines and billing.

Service Establishment Charge

A one-time fee required to start electric service at an address. Normally, it is included on your first bill and is due by the due date specified.

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Service Level

The service level is a segmentation of customers within one rate schedule, based on the amount of voltage required by the customer. The three service levels are:

  • S - Secondary Service is taken at 480 volts or less, or where the definitions of Primary Service and Transmission Service do not apply. Idaho Power is responsible for providing the transformation of power voltage to the level at which it is to be used by the customer taking Secondary Service.

  • P - Primary Service is service at 12.5 kilovolts (kV) to 34.5 kV. A customer taking Primary Service is responsible for providing the transformation (step-down) of power to the voltage at which it is to be used by that customer.

  • T - Transmission Service is service taken at 45 kV or higher. A customer taking Transmission Service is responsible for providing the transformation of power to the voltage at which it is to be used.

Service Location

The address where the account's service is delivered.

Service Period

The start and end dates for a specific bill. These dates are approximately the same each month.

Solar Photovoltaic Pilot Program Rider

This charge is for Oregon customers only. It is designed to recover costs associated with the development of a pilot program for solar photovoltaic energy systems mandated by Oregon House Bill 3690.

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Time of Use (TOU) Rates

A rate system for customers, designed to reflect the higher energy costs during the peak months of the year (see Seasonal Rates) and hours of the day.

Both the energy charge and the demand charge (see Rate Schedule) may vary by hour and month.

For a more comprehensive definition of time-of-use billing, contact us.


The practical unit of power defined as the rate at which energy is delivered or consumed. The basic unit for measuring the power used by an electrical device.

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