Oregon WARM Billing Method

Learn about WARM, and how it affects your bill.

WARM (Weather Adjusted Rate Mechanism) is NW Natural's default billing method that adjusts Oregon customers' bills for the December 1-May 15 heating season.

How WARM Works

WARM is intended to smooth out fluctuations in winter bills caused by weather variances. WARM calculates a bill adjustment that offsets the effect that colder- or warmer-than-average winter temperatures have on our customers’ gas use. If weather is colder than average, WARM will lower the billing rate; if weather is warmer than average, WARM will increase the billing rate.

What are the benefits of WARM?

  • WARM helps avoid big winter bill fluctuations due to increased gas use when weather is colder than normal.
  • WARM was designed for winter bills to reflect weather variances during the months that a colder- or warmer-than-average weather event occurs. Thus, NW Natural will not over-collect or under-collect the revenues needed to cover the costs associated with bringing service to our customers.
  • Since its inception, WARM has resulted in a net benefit to Oregon customers, with eight out of the last 13 WARM heating seasons resulting in winter bill savings.

Determine if you are in WARM

To determine if you are currently in WARM, look for a message on your bill. Each year, customers may opt into or out of the WARM billing method between May 16 and September 30.

For more information, please see the Frequently Asked Questions.