Understanding Your Bill

WBMLP's Headquarters
WBMLP Headquarters

Helpful Information About Your WBMLP Electric Bill

Here are answers to common Electric Bill questions. See the sample bill on this page. Definitions to bill categories are just below.

Got a question? Please give us a call during regular business hours at 508-835-3681.

There are 4 ways to pay your WBMLP bill:

  • By Mail using the enclosed envelope that comes with your bill.
  • Pay Online. Click here to pay safely and securely with UniPay Gold.
  • By stopping by our office with Cash or a Check.
  • By Automatic Payment. Click here for more details, or here to download an Automatic Payment Authorization Form.

Explaining Your WBMLP Bill

Taking It From The Top

Title Description
"Discount" and "Net due if received by" This is the total amount due for the month, minus the early payment discount, if applicable.
"Rate Code" This is your type of account. R = Residential Rate.
(See WBMLP's Rates Page for other categories.)
"Meter Reading Present" This is our most recent meter reading. You can read the meter yourself by looking at the digit display on the meter.
"kWh Used" This is how many kWh's (the amount of electricity that you consumed) during the month.
"Days in Cycle" The number of days between meter readings. (There were 28 days in the sample billing cycle.)
"Actual Monthly Usage" This area allows you to see your monthly energy consumption history over the past 12 months.
"Avg Daily Usage" This is the kWh's per day that you consume. Look for trends and determine what appliances in your home that may be contributing to higher consumption.
"Customer Charge" This is the amount WBMLP charges to cover our fixed expenses, no matter how many kWh's you consume.
"Distribution Charge" This is the amount WBMLP charges to cover our fixed expenses, no matter how many kWh's you consume.
"Purchased Power Adjustment" The Purchased Power Adjustment helps us adjust the bills up or down to account for fluctuating market power and transmission costs.
"PASNY Credit" A discount on all residential bills as a result of WBMLP purchasing very inexpensive hydroelectricity energy from the Niagara and St. Lawrence River.
"Discount if Payment Received by:" WBMLP Customers receive a 10% discount if they pay their monthly bill within 10 days.

Heating and Cooling Degree Days—How They Relate To Your Bill

Weather is one of the most important factors influencing electricity consumption. Variations in weather and how you heat and cool your home or business can dramatically increase your monthly electricity bill.

One way to account for the monthly impact of weather is to use “Degree Days” to compare one monthly bill to another.

Degree Days assume that when the outside temperature is 65°F, we do not need heating or cooling to be comfortable. Degree Days are the difference between the daily temperature mean, (high temperature plus low temperature divided by two) and 65°F.

If the temperature mean is above 65°F, we subtract 65 from the mean and the result is “Cooling Degree Days” (CDD). If the temperature mean is below 65°F, we subtract the mean from 65 and the result is “Heating Degree Days” (HDD).

Electricity consumption is billed monthly. The daily heating and cooling “Degree Day” values are added together, starting with the first day of the monthly bill period, through the last day of the monthly bill period. A typical monthly bill period is 28-31 days, so you add up all the Degree Days” within that period. The total number of Degree Days can be compared to another month to see how much colder or hotter it was. This is a convenient way to measure weather-related electricity usage, season to season.


Example 1: The high temperature for a particular day was 90°F and the low temperature was 66°F. The temperature mean for that day was:
( 90°F + 66°F ) / 2 = 78°F

Because the result is above 65°F:
78°F - 65°F = 13 Cooling Degree Days


Example 2: The high temperature for a particular day was 33°F and the low temperature was 25°F. The temperature mean for that day was:
( 33°F + 25°F ) / 2 = 29°F

Because the result is below 65°F:
65°F - 29°F = 36 Heating Degree Days


The calculations shown in the two examples above are performed for each day of the year and the daily Degree Days are accumulated for each billing period so that we can compare months and seasons.

Below is a chart of the Worcester MA area Heating and Cooling Degree Days for our typical monthly bill periods.

Degree Days Chart

High Bill Inquiries

Customers usually call us when their current electricity bill is much higher compared to last month—or even last year. Reviewing the Heating and Cooling Degree Days for those months can help explain why your current bill is higher or lower.

For example, in the February 2021 bill period, there were 1,126 “Heating Degree Days”. In February 2020, there were only 835 “Heating Degree Days”. The 26% increase in “Heating Degree Days” in February 2021 means it was much colder this year compared to February 2020. And because of this colder weather, customers generally consumed a lot more electricity.


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