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Understanding Your Bill


Weather Normalization Adjustment

The Weather Normalization Adjustment (WNA) is a method of billing based on “normal” weather approved by the Kentucky Public Service Commission. Today, we utilize 20-year average temperature information provided by the National Oceanic and Atmospheric Administration (NOAA) to define normal weather and the Degree Days Deficiencies method to determine heating requirements. This recognized standard enables Columbia to remove the effects of abnormal weather on the delivery portion of your bill during the heating season (December through April).

WNA enables the utility to manage fixed costs to provide service. Delivery charges, including the monthly customer charge and volumetric delivery charges, cover the costs associated with making natural gas available at your home or business like customer service, line inspection and repair, and 24-hour emergency service.

How it works: The delivery charge usage is adjusted to reflect “normal” weather rather than actual weather. So, if the weather is colder than normal, the WNA is a credit which reduces the amount of the delivery charge. If the weather is warmer than normal, the WNA is a debit which increases the amount of the delivery charge. Over time, your bill should total the same as it would without the application of the weather normalization factor. WNA simply provides a more even method of collecting delivery costs.

Budget Payment Plan

To help you keep track of your Budget Payment Plan status, each month’s bill will list the current status of your Budget Payment Plan compared to your Actual Account Summary, as well as the number of months remaining in your Budget year.

How Your Bill is Calculated