NorthWestern Energy Electric Monthly Supply Rates
 New Rate Effective Date March 1, 2010
Residential  
Electric Lighting
Effective Date
Price/kWh
  
Change
   Effective Date
Price/KWh
  
Change
April 1, 2009 $ 0.055355     $(0.001915)   April 1, 2009 $ 0.050936     $ (0.001732)
May 1, 2009
$ 0.054952
 
  $(0.000403)
  May 1, 2009
$ 0.050572
 
  $ (0.000364)
June 1, 2009
$ 0.057106
 
  $ 0.002154
  June 1, 2009
$ 0.052503
 
  $  0.001931
July 1, 2009 $ 0.055043
 

  $(0.002063)

  July 1, 2009 $ 0.050631     $(0.001872)
August 1, 2009 $ 0.055249  
  $ 0.000206
  August 1, 2009
$ 0.050800
 
  $ 0.000169
September 1, 2009
$ 0.056326
 
  $ 0.001077
  September 1, 2009
$ 0.051774
 
  $ 0.000974
October 1, 2009
$ 0.055528
 
  $(0.000798)
  October 1, 2009
$ 0.051053
 
  $(0.000721)
November 1, 2009
$ 0.056796
 
  $ 0.001268
  November 1, 2009
$ 0.052200
    $ 0.001147
December 1, 2009
$ 0.055501
 
  $(0.001295)
  December 1, 2009
$ 0.051028
 
  $(0.001172)
January 1, 2010 $ 0.055841
    $ 0.000340   January 1, 2010 $ 0.051270
    $ 0.000242
February 1, 2010 $ 0.056487
    $ 0.000646
  February 1, 2010 $ 0.051854
    $ 0.000584
March 1, 2010 $ 0.055759  
  $(0.000728)
  March 1, 2010
$ 0.051195
 
  $(0.000659)
                  
GS-1 Secondary Non-Demand   GS-1 Secondary Demand
Effective Date
Price/kWh
  
Change
   Effective Date
Price/kWh
  
Change
April 1, 2009
$ 0.050936
 
  $(0.001732)
  April 1, 2009
$ 0.055355
    $ (0.001915)
May 1, 2009
$ 0.050572
 
  $(0.000364)
  May 1, 2009
$ 0.054952
    $ (0.000403)
June 1, 2009
$ 0.052503
 
  $ 0.001931
  June 1, 2009
$ 0.057106
    $  0.002154
July 1, 2009
$ 0.050631
 
  $(0.001872)
  July 1, 2009 $ 0.055043     $ (0.002063)
August 1, 2009
$ 0.050800
 
  $ 0.000169
  August 1, 2009
$ 0.055249
    $  0.000206
September 1, 2009
$ 0.051774
 
  $ 0.000974
  September 1, 2009
$ 0.056326
    $  0.001077
October 1, 2009 $ 0.051053  
  $(0.000721)
  October 1, 2009
$ 0.055528
    $ (0.000798)
November 1, 2009
$ 0.052200
 
  $ 0.001147
  November 1, 2009
$ 0.056796
 
  $  0.001268
December 1, 2009
$ 0.051028
 
  $(0.001172)
  December 1, 2009
$ 0.055501
    $ (0.001295)
January 1, 2010 $ 0.051270
    $ 0.000242   January 1, 2010 $ 0.055841
    $  0.000340
February 1, 2010 $ 0.051854
    $ 0.000584
  February 1, 2010 $ 0.056487
    $  0.000646
March 1, 2010
$ 0.051195
 
  $(0.000659)
  March 1, 2010
$ 0.055759
    $ (0.000728)
                  
GS-1 Primary Non-Demand   GS-1 Primary Demand
Effective Date
Price/kWh
  
Change
   Effective Date
Price/kWh
  
Change
April 1, 2009
$ 0.053838
 
  $ (0.001862)
  April 1, 2009
$ 0.049925
 
  $ (0.001700)
May 1, 2009
$ 0.053446
 
  $ (0.000392)
  May 1, 2009
$ 0.049567
 
  $ (0.000358)
June 1, 2009
$ 0.055541
 
  $ 0.002095
  June 1, 2009
$ 0.051464
 
  $  0.001897
July 1, 2009
$ 0.053535
 
  $(0.002006)
  July 1, 2009
$ 0.049627
 
  $(0.001837)
August 1, 2009
$ 0.053735
 
  $ 0.000200
  August 1, 2009
$ 0.049794
 
  $ 0.000167
September 1, 2009
$ 0.054782
 
  $ 0.001047
  September 1, 2009
$ 0.050750
 
  $ 0.000956
October 1, 2009
$ 0.054006
 
  $(0.000776)
  October 1, 2009
$ 0.050042
 
  $(0.000708)
November 1, 2009
$ 0.055240
 
  $ 0.001234
  November 1, 2009
$ 0.051168
 
  $ 0.001126
December 1, 2009
$ 0.053980
 
  $(0.001260)
  December 1, 2009
$ 0.050018
 
  $(0.001150)
January 1, 2010 $ 0.054310
    $ 0.000330
  January 1, 2010 $ 0.050261
    $ 0.000243
February 1, 2010 $ 0.054938
    $ 0.000628
  February 1, 2010 $ 0.050834
    $ 0.000573
March 1, 2010
$ 0.054230
 
  $(0.000708)
  March 1, 2010
$ 0.050187
 
  $(0.000647)
                  
Irrigation Non-Demand   Irrigation Demand
Effective Date
Price/kWh
  
Change
   Effective Date
Price/kWh
  
Change
April 1, 2009
$ 0.050936
 
  $ (0.001732)
  April 1, 2009
$ 0.050936
 
  $ (0.001732)
May 1, 2009 $ 0.050572  
  $ (0.000364)
  May 1, 2009
$ 0.050572
 
  $ (0.000364)
June 1, 2009
$ 0.052503
 
  $  0.001931
  June 1, 2009
$ 0.052503
 
  $  0.001931
July 1, 2009
$ 0.050631
 
  $ (0.001872)
  July 1, 2009
$ 0.050631
 
  $ (0.001872)
August 1, 2009
$ 0.050800
 
  $  0.000169
  August 1, 2009
$ 0.050800
 
  $  0.000169
September 1, 2009
$ 0.051774
  
  $  0.000974
  September 1, 2009
$ 0.051774
 
  $  0.000974
October 1, 2009
$ 0.051053
 
  $ (0.000721)
  October 1, 2009
$ 0.051053
 
  $ (0.000721)
November 1, 2009
$ 0.052200
 
  $  0.001147
  November 1, 2009
$ 0.052200
 
  $  0.001147
December 1, 2009
$ 0.051028
 
  $ (0.001172)
  December 1, 2009 $ 0.051028     $ (0.001172)
January 1, 2010 $ 0.051270
    $  0.000242
  January 1, 2010 $ 0.051270
    $  0.000242
February 1, 2010 $ 0.051854
    $  0.000584
  February 1, 2010 $ 0.051854
    $  0.000584
March 1, 2010
$ 0.051195
    $ (0.000659)   March 1, 2010
$ 0.051195
 
  $ (0.000659)
                  
GS-2 Substation   GS-2 Transmission
Effective Date
Price/kWh
  
Change
   Effective Date
Price/kWh
  
Change
April 1, 2009
$ 0.053373
 
  $ (0.001846)
  April 1, 2009
$ 0.053051
 
  $ (0.001835)
May 1, 2009
$ 0.052985
 
  $ (0.000388)
  May 1, 2009
$ 0.052665
 
  $ (0.000386)
June 1, 2009
$ 0.055062
 
  $  0.002077
  June 1, 2009
$ 0.054730
 
  $  0.002065
July 1, 2009
$ 0.053073
 
  $ (0.001989)
  July 1, 2009
$ 0.052753
 
  $ (0.001977)
August 1, 2009
$ 0.053271
 
  $  0.000198
  August 1, 2009
$ 0.052950
 
  $  0.000197
September 1, 2009
$ 0.054309
 
  $  0.001038
  September 1, 2009
$ 0.053982
 
  $  0.001032
October 1, 2009
$ 0.053540
 
  $ (0.000769)
  October 1, 2009
$ 0.053218
 
  $ (0.000764)
November 1, 2009
$ 0.054763
 
  $  0.001223
  November 1, 2009
$ 0.054434
 
  $  0.001216
December 1, 2009 $ 0.053514  
  $ (0.001249)
  December 1, 2009
$ 0.053193
 
  $ (0.001241)
January 1, 2010 $ 0.053841
    $  0.000327
  January 1, 2010 $ 0.053518
    $  0.000325
February 1, 2010 $ 0.054464
    $  0.000623
  February 1, 2010 $ 0.054137
    $  0.000619
March 1, 2010
$ 0.053762
    $ (0.000702)   March 1, 2010
$ 0.053439
    $ (0.000698)
       
       
Electric supply rates change monthly based on current projected 12-month market prices. The revenues collected compared to actual costs incurred by NWE are trued up on an annual basis. NWE purchases wholesale electricity from producers and passes the cost directly to customers without markup.