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58
Appendix 58
NorthWestern Energy Profile
Authorized
Jurisdiction and Service
Montana electric delivery and production (1)
Montana - Colstrip Unit 4
Implementation
Date
April 2019
Rate Base
Estimated
Rate Base
Authorized
Overall Rate
Authorized
Return on
(millions)
(millions)
of Return
Equity
Authorized
Equity Level
2,030.1
2,500.9
6.92%
9.65%
49.38%
April 2019
304.0
272.4
8.25%
10.00%
50.00%
Montana natural gas delivery and production (2) September 2017
430.2
516.1
6.96%
9.55%
46.79%
Total Montana
South Dakota electric (3)
South Dakota natural gas (3)
Total South Dakota
Nebraska natural gas (3)
Total NorthWestern Energy
2,764.3
3,289.4
December 2015
557.3
626.8
7.24%
n/a
n/a
December 2011
65.9
77.4
7.80%
n/a
n/a
623.2
704.2
December 2007
24.3
3,411.8
37.8
4,031.4
8.49%
10.40% n/a
(1) The revenue requirement associated with the FERC regulated portion of Montana electric transmission and ancillary services are included as revenue credits to
our MPSC jurisdictional customers. Therefore, we do not separately reflect FERC authorized rate base or authorized returns.
(2) The Montana gas revenue requirement includes a step down which approximates annual depletion of our natural gas production assets included in rate base.
(3) For those items marked as "n/a," the respective settlement and/or order was not specific as to these terms.
Note:
Data as reported in our 2020 10-K
We anticipate current capital investment projections to
result in annualized rate base growth of 4%-5%
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