Winter view of Boundary Dam from the west bank of the Pend Oreille River., Photographed by Peter Clarke
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How to Compute Your Bill


Monthly Average Bill for Seattle City Light Customer


Use our Excel-based Customer Bill Calculator to determine your average monthly bill in 2014-2016.

How to Find Your Rate Code


Click here for an example bill that shows you where to find your Rate Code.

Common Questions about Seattle City Light's Residential Billing Procedures

  1. New rates went into effect on January 1, 2015 and my billing period is from December 1, 2014 to January 30, 2015. How is the rate change accounted for in my bill calculation?
Rate changes are prorated based on the actual number of days in the billing period. If there are 30 days under the new rates and 60 days in the billing period, the bill will be calculated with 30 days (December 2 through December 31 - December 1 is not counted) on the old rates, and 30 days (January 1 through January 30) on the new rates. For new rates starting on January 1, count January 1 as the first day and count every succeeding day including the "Service To:" date.

Prorating the Old and New Rates
Account # xxx                                                                    Rate RSC
Service from December 1, 2014 through January 30, 2015
Days under the old rate: 30 days (December 2 through December 31)
Days under the new rate: 30 days (January 1 through January 30)
Calculating the Bills
Consumption kWh                                                                     11,800
Number of Billing Days                                                                     60
Daily Average kWh =11,800 kWh/60 Days                                   196.67
Bill Under Old Rates: December 2 through December 31
30 Days * 196.67 kWh                                                                 5,900
16 kWh/day x 30 days                                                                    480
(5,900 kWh - 480 kWh)                                                                5,420
480 kWh x $0.0506/kWh                                                        $    24.29
5,420 kWh x $0.1149/kWh                                                     $   622.76
Base Service Charge (30 days x $0.1607)                                $      4.82
Bill Under Old Rates                                                            $   651.87
Bill Under New Rates: January 1 through January 30
30 Days * 196.67 kWh                                                                 5,900
16 kWh/day x 30 days                                                                    480
(5,900 kWh - 480 kWh)                                                                5,420
480 kWh x $0.0557/kWh                                                        $    26.74
5,420 kWh x $0.1189/kWh                                                     $   644.44
Base Service Charge (30 days x $0.1451)                                $      4.35
Bill Under New Rates                                                           $  675.53
Total Bill                                                                           $  1,327.40
  1. How are bills calculated when there is a switch from one season to another?
If two seasons are involved in the billing period, the bill is prorated based on the actual number of days in the billing period. If there are 30 days under the new season and 59 days in the billing period, the bill is calculated 30 days on the new season rates and 59 minus 30 days on the old season rates. For example, a bill with a "Service From:" date of March 2 and "Service To:" date of April 30 will have 29 days on winter rates (from March 3 through March 31) and 30 days on summer rates (April 1 through April 30).

Switching from One Season to Another
Account # xxx                                                                    Rate RSC
Service from March 2 through April 30, 2015
Days under the winter season: 29 days (March 3 through March 31)
Days under the summer season: 30 days (April 1 through April 30)
Calculating the Winter and Summer Bills
Consumption kWh                                                                       3,895
Number of Billing Days                                                                     59
Daily Average kWh = 3,895 kWh/59 Days                                      66.02
Bill Under the Winter Season: March 3 through March 31
29 Days * 66.02 kWh                                                                   1,914
16 kWh/day x 29 days                                                                    464
(1,914 kWh - 464 kWh)                                                                1,450
464 kWh x $0.0557/kWh                                                        $    25.84
1,450 kWh x $0.1189/kWh                                                     $   172.41
Base Service Charge (29 days x $0.1451)                                $      4.21
Bill Under Winter Season                                                    $   202.46
Bill Under the Summer Season: April 1 through April 30
30 Days * 66.02 kWh                                                                   1,981
10 kWh/day x 30 days                                                                    300
(1,981 kWh - 300 kWh)                                                                1,681
300 kWh x $0.0557/kWh                                                        $    16.71
1,681 kWh x $0.1189/kWh                                                     $   199.87
Base Service Charge (30 days x $0.1451)                                $      4.35
Bill Under Summer Season                                                 $  220.93
Total Bill                                                                              $  423.39
  1. I'm a City of Seattle residential customer and I can't understand how the two prices work for the two different amounts of electricity used and how the base service charge is calculated.
In a summer billing period with 62 days, the first 620 kWh (10 kWh /day) are billed at $0.0557/kWh and all kWh over 620 are billed at $0.1189/kWh (rates effective January 1, 2015), plus $9.00 for the base service charge of $0.1451 per day.

In a winter billing period with 58 days, the first 928 kWh (16 kWh/day) are billed at $0.0557/kWh and all kWh over 928 are billed at $0.1189/kWh (rates effective January 1, 2015), plus $8.42 for the base service charge of $0.1451 per day.

For summer billing periods longer (or shorter) than 60 days, the allotment of electricity at the first block price is computed on a daily basis using 10 kWh/day. All kWh over 10 kWh/day are priced at the end-block price. The base service charge is computed at $0.1451 per day.

For winter billing periods longer (or shorter) than 60 days, the allotment of electricity at the first block price is computed on a daily basis using 16 kWh/day. All kWh over 16 kWh/day are priced at the end-block price. The base service charge is computed at $0.1451 per day.

Calculating Residential City Summer Bill
Account # xxx                                                                    Rate RSC
Service from July 17 through September 17, 2015
Consumption kWh                                                                      3,526
10 kWh/day x 62 days                                                                   620
(3,526 kWh - 620 kWh)                                                                2,906
620 kWh x $0.0557/kWh                                                        $    34.53
2,906 kWh x $0.1189/kWh                                                     $   345.52
Base Service Charge (62 days x $0.1451)                                $      9.00
Bill Under Summer Rates                                                    $   389.05
Calculating Residential City Winter Bill
Account # xxx                                                                    Rate RSC
Service from October 10 through December 7, 2015
Consumption kWh                                                                       5,294
16 kWh/day x 58 days                                                                    928
(5,294 kWh - 928 kWh)                                                                4,366
928 kWh x $0.0557/kWh                                                        $    51.69
4,366 kWh x $0.1189/kWh                                                     $   519.12
Base Service Charge (58 days x $0.1451)                                $      8.42
Bill Under Winter Rates                                                       $   579.23


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