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Note 3 - Rate and Regulatory Matters (Tables) | 9 Months Ended
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Sep. 30, 2020
Notes Tables |
Schedule of Revenues Recorded under Rate Riders [Table Text Block] |
|  | Three Months Ended September 30, |  |  | Nine Months Ended September 30, |
Rate Rider (in thousands) |  | 2020 |  |  | 2019 |  |  | 2020 |  |  | 2019 |
Minnesota |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Renewable Resource Recovery |  | $ | 3,318 |  |  | $ | 1,316 |  |  | $ | 9,660 |  |  | $ | 3,949 |
Conservation Improvement Program Costs and Incentives |  |  | 2,096 |  |  |  | 1,518 |  |  |  | 4,703 |  |  |  | 4,246 |
Transmission Cost Recovery |  |  | 2,001 |  |  |  | (284 | ) |  |  | 2,402 |  |  |  | 301 |
Environmental Cost Recovery |  |  | - |  |  |  | - |  |  |  | - |  |  |  | (1 | )
North Dakota |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Renewable Resource Adjustment |  |  | 1,256 |  |  |  | (20 | ) |  |  | 3,455 |  |  |  | 616 |
Transmission Cost Recovery |  |  | 809 |  |  |  | 908 |  |  |  | 3,131 |  |  |  | 3,554 |
Generation Cost Recovery |  |  | 1,187 |  |  |  | 137 |  |  |  | 3,035 |  |  |  | 607 |
Environmental Cost Recovery |  |  | - |  |  |  | (7 | ) |  |  | - |  |  |  | 556 |
South Dakota |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Transmission Cost Recovery |  |  | 450 |  |  |  | 743 |  |  |  | 1,383 |  |  |  | 1,587 |
Conservation Improvement Program Costs and Incentives |  |  | 194 |  |  |  | 100 |  |  |  | 748 |  |  |  | 440 |
Environmental Cost Recovery |  |  | - |  |  |  | (2 | ) |  |  | - |  |  |  | (29 | )
Phase-In Rate Plan |  |  | (53 | ) |  |  | (10 | ) |  |  | (77 | ) |  |  | (10 | )
Total |  | $ | 11,258 |  |  | $ | 4,399 |  |  | $ | 28,440 |  |  | $ | 15,816 |
Schedule of Information on Status of Updates for Previous Periods [Table Text Block] |
Rate Rider |  | R - Request Date A - Approval Date | Effective Date Requested or Approved |  | Annual Revenue ($000s) |  | Rate
Minnesota |  |  |  |  |  |  |  |  |  |
Conservation Improvement Program |  |  |  |  |  |  |  |  |  |
2019 Incentive and Cost Recovery |  | A – | August 18, 2020 | October 1, 2020 |  | $ | 8,247 |  | $0.00485 | /kwh
2018 Incentive and Cost Recovery |  | A – | December 27, 2019 | January 1, 2020 |  | $ | 11,926 |  | $0.00710 | /kwh
2017 Incentive and Cost Recovery |  | A – | October 4, 2018 | November 1, 2018 |  | $ | 10,283 |  | $0.00600 | /kwh
Transmission Cost Recovery |  |  |  |  |  |  |  |  |  |
2018 Annual Update–Updated Request |  | A – | October 22, 2020 | January 1, 2021 |  | $ | 10,260 |  | Various
2017 Rate Reset |  | A – | October 30, 2017 | November 1, 2017 |  | $ | (3,311 | ) | Various
Environmental Cost Recovery |  |  |  |  |  |  |  |  |  |
2018 Annual Update |  | A – | November 29, 2018 | December 1, 2018 |  | $ | - |  | 0% | of base
Renewable Resource Adjustment |  |  |  |  |  |  |  |  |  |
2019 Annual Update – Revised |  | A – | December 19, 2019 | January 1, 2020 |  | $ | 12,506 |  | $0.00467 | /kwh
2018 Annual Update |  | A – | August 29, 2018 | November 1, 2018 |  | $ | 5,886 |  | $0.00219 | /kwh
North Dakota |  |  |  |  |  |  |  |  |  |
Renewable Resource Adjustment |  |  |  |  |  |  |  |  |  |
2020 Annual Update |  | A – | March 18, 2020 | April 1, 2020 |  | $ | 5,762 |  | 5.637% | of base
2019 Annual Update |  | A – | May 1, 2019 | June 1, 2019 |  | $ | (235 | ) | -0.224% | of base
2018 Rate Reset for effect of TCJA |  | A – | February 27, 2018 | March 1, 2018 |  | $ | 9,650 |  | 7.493% | of base
Transmission Cost Recovery |  |  |  |  |  |  |  |  |  |
2020 Annual Update |  | R – | August 31, 2020 | January 1, 2021 |  | $ | 5,570 |  | Various
2019 Annual Update |  | A – | December 18, 2019 | January 1, 2020 |  | $ | 5,739 |  | Various
2018 Supplemental Update |  | A – | December 6, 2018 | February 1, 2019 |  | $ | 4,801 |  | Various
2018 Rate Reset for effect of TCJA |  | A – | February 27, 2018 | March 1, 2018 |  | $ | 7,469 |  | Various
Environmental Cost Recovery |  |  |  |  |  |  |  |  |  |
2019 Update |  | A – | October 22, 2019 | November 1, 2019 |  | $ | - |  | 0% | of base
2018 Update |  | A – | December 19, 2018 | February 1, 2019 |  | $ | (378 | ) | -0.310% | of base
2018 Rate Reset for effect of TCJA |  | A – | February 27, 2018 | March 1, 2018 |  | $ | 7,718 |  | 5.593% | of base
Generation Cost Recovery |  |  |  |  |  |  |  |  |  |
2020 Annual Update |  | A – | June 10, 2020 | July 1, 2020 |  | $ | 6,184 |  | 6.041% | of base
2019 Initial Request |  | A – | May 15, 2019 | July 1, 2019 |  | $ | 2,720 |  | 2.547% | of base
South Dakota |  |  |  |  |  |  |  |  |  |
Transmission Cost Recovery |  |  |  |  |  |  |  |  |  |
2020 Annual Update |  | A – | February 19, 2020 | March 1, 2020 |  | $ | 2,327 |  | Various
2019 Rate Reset |  | A – | September 17, 2019 | October 1, 2019 |  | $ | 2,046 |  | Various
2019 Annual Update |  | A – | February 20, 2019 | March 1, 2019 |  | $ | 1,638 |  | Various
2018 Interim Rate Reset |  | A – | October 18, 2018 | October 18, 2018 |  | $ | 1,171 |  | Various
Environmental Cost Recovery |  |  |  |  |  |  |  |  |  |
2018 Interim Rate Reset |  | A – | October 18, 2018 | October 18, 2018 |  | $ | (189 | ) | -$0.00075 | /kwh
Phase-In Rate Plan Recovery |  |  |  |  |  |  |  |  |  |
2020 Annual Update |  | A – | August 6, 2020 | September 1, 2020 |  | $ | 1,625 |  | 6.521% | of base
2019 Initial Request |  | A – | August 21, 2019 | September 1, 2019 |  | $ | 864 |  | 3.345% | of base

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