NorthWestern Energy LLC: average electricity price and bill
- Annual file
- Form EIA-861, 2024 final
- Monthly data
- to July 2026
The average residential price of NorthWestern Energy LLC was 16.31 cents per kilowatt-hour (kWh) in July 2026. Monthly sample, Form EIA-861M
In July 2025, the price was 15.85 cents per kWh. In July 2026, the Montana average was 14.99 cents per kWh. EIA marks this month as preliminary.
For 2024, the newest final year, the price was 14.23 cents per kWh.
The average monthly bill of a residential customer was $101.19 in 2024, for 711 kWh each month. The Montana average price was 12.66 cents per kWh in 2024. The US average price was 16.48 cents per kWh in 2024.
Average price of electricity to ultimate consumers represents the cost per unit of electricity sold and is calculated by dividing electric revenue from ultimate consumers by the corresponding sales of electricity.
The average price of electricity to ultimate consumers reported in this publication by sector represents a weighted average of consumer revenue and sales, and does not equal the per kWh rate charged by the electric power industry participant to the individual consumers.
EIA's words. Source: U.S. Energy Information Administration, Electric Power Monthly, Technical notes, section "Form EIA-861" (March 2024). "This publication" is the Electric Power Monthly.
In plain words: the average price is revenue divided by sales. It is not the rate on a rate schedule. The annual figures on this page are for 2024. Monthly data through .
Since the last EIA release: no tracked figure of NorthWestern Energy LLC changed. The record of changes starts with the next release. EIA releases and changes
Price and bill beside Montana, the ownership type and the US
Form EIA-861, 2024
| Figure | This utility | Investor-owned utilities, US median | Montana | United States |
|---|---|---|---|---|
| Average residential price (cents per kWh) | 14.23 | 16.17 | 12.66 | 16.48 |
| Average monthly bill (dollars per month) | $101.19 | $131.47 | $107.91 | $142.26 |
| Average monthly use (kWh per month) | 711 | 787 | 852 | 863 |
| Change of the price in 1 year (percent) | -2.6% | n/a | +1.0% | +3.0% |
| Change of the price in 5 years (percent) | +18.5% | n/a | +13.7% | +26.7% |
State and US figures are EIA's own averages for all customers. The ownership column is a median of utilities with 1,000 or more residential customers, from the final 2024 file.
The average monthly bill is residential revenue divided by customers and by 12 months. The use is residential sales divided by customers and by 12 months. These figures are for bundled service only.
14.23 cents per kWh, NorthWestern Energy LLC, 2024
Figures for each state, 2024
Sales by sector
Form EIA-861, 2024
| Sector | Customers | Sales | Share of sales percent | Revenue dollars | Average price, bundled cents per kWh |
|---|---|---|---|---|---|
| Residential | 328,421 | 2.8 TWh | 30 | 398,790,300 | 14.23 |
| Commercial | 85,310 | 3.2 TWh | 34 | 424,721,000 | 13.51 |
| Industrial | 2,275 | 3.4 TWh | 36 | 60,140,000 | 10.77 |
Customers, sales and revenue include each service type that the utility reported. The price column uses bundled service only. Sources of energy: 8 TWh in total. The utility generated 55% and bought 3.6 TWh. Summer peak demand: 2,089 MW.
Price history
Form EIA-861, 2013 to 2024
NorthWestern Energy LLCMontana averageUS average
Table of the figures by year, 2013 to 2024
| Year | Average price cents per kWh | Montana average cents per kWh | Average bill dollars per month | Average use kWh per month | Residential customers | Sales, all sectors |
|---|---|---|---|---|---|---|
| 2024 | 14.23 | 12.66 | $101.19 | 711 | 328,421 | 9.4 TWh |
| 2023 | 14.61 | 12.54 | $105.52 | 722 | 322,489 | 9.4 TWh |
| 2022 | 12.43 | 11.33 | $93.69 | 754 | 316,968 | 9.4 TWh |
| 2021 | 12.14 | 11.22 | $88.49 | 729 | 311,923 | 9 TWh |
| 2020 | 12.16 | 11.24 | $86.89 | 714 | 307,390 | 8.9 TWh |
| 2019 | 12.01 | 11.13 | $85.21 | 709 | 303,223 | 9.5 TWh |
| 2018 | 11.73 | 10.96 | $82.22 | 701 | 299,438 | 9.1 TWh |
| 2017 | 11.76 | 10.95 | $84.23 | 716 | 295,427 | 8.9 TWh |
| 2016 | 11.77 | 10.94 | $79.82 | 678 | 291,348 | 8.6 TWh |
| 2015 | 11.82 | 10.88 | $80.79 | 684 | 287,387 | 8.7 TWh |
| 2014 | 10.73 | 10.18 | $75.72 | 706 | 283,349 | 8.6 TWh |
| 2013 | 11.20 | 10.33 | $81.42 | 727 | 276,353 | 8.7 TWh |
Price by month
NorthWestern Energy LLC (MT)Montana average
Reliability: SAIDI and SAIFI
Form EIA-861, 2024
- SAIDI with major event days: 233.4 minutes without power for each customer in 2024, about 4 hours.
- SAIDI without major event days: 117.9 minutes for each customer in 2024, about 2 hours.
- SAIFI with major event days: 1.30 interruptions for each customer in 2024.
| Figure | This utility | Montana, median of 9 utilities | Montana, EIA total | US, median of 893 utilities |
|---|---|---|---|---|
| SAIDI with major event days (minutes per customer per year) | 233.4 | 352.4 | 351.5 | 184.5 |
| SAIDI without major event days (minutes per customer per year) | 117.9 | 177.2 | 156.6 | 99.8 |
| SAIFI with major event days (interruptions per customer per year) | 1.30 | 1.30 | 1.62 | 1.40 |
| SAIFI without major event days (interruptions per customer per year) | 0.95 | 1.20 | 1.16 | 1.01 |
The utility reported these figures to EIA with the IEEE 1366 standard. Methods differ between utilities. What SAIDI and SAIFI mean
For utilities using the IEEE method, a Major Event Day is any day that exceeds a daily SAIDI threshold called Tmed. Tmed is a duration statistic calculated from daily SAIDI values from the past five years. For utilities not using IEEE methods, Major Events are self-determined by the reporting utility.
EIA's words. Source: U.S. Energy Information Administration, Electric Power Annual with data for 2024, Table 11.1, notes (October 2025).
Table of SAIDI and SAIFI by year, 2013 to 2024
| Year | SAIDI minutes, with major event days | SAIDI minutes, without major event days | SAIFI interruptions per customer, with major event days | SAIFI interruptions per customer, without major event days | Method |
|---|---|---|---|---|---|
| 2024 | 233.4 | 117.9 | 1.30 | 0.95 | IEEE 1366 |
| 2023 | 102.5 | 102.5 | 0.93 | 0.93 | IEEE 1366 |
| 2022 | 132.1 | 118.6 | 1.14 | 1.09 | IEEE 1366 |
| 2021 | 151.4 | 128.4 | 1.37 | 1.18 | IEEE 1366 |
| 2020 | 165.5 | 120.2 | 1.13 | 1.02 | IEEE 1366 |
| 2019 | 114.0 | 114.0 | 1.16 | 1.16 | IEEE 1366 |
| 2018 | 103.0 | 103.0 | 1.08 | 1.08 | IEEE 1366 |
| 2017 | 157.0 | 141.0 | 1.38 | 1.30 | IEEE 1366 |
| 2016 | 142.0 | 111.0 | 1.21 | 1.07 | IEEE 1366 |
| 2015 | 259.6 | 113.8 | 1.57 | 1.32 | IEEE 1366 |
| 2014 | 112.9 | 112.9 | 1.08 | 1.08 | IEEE 1366 |
| 2013 | 146.0 | 133.0 | 1.31 | 1.24 | IEEE 1366 |
Counties in the service territory
Form EIA-861, 2024
Show all 38 counties
- Beaverhead County MT
- Big Horn County MT
- Blaine County MT
- Broadwater County MT
- Carbon County MT
- Cascade County MT
- Chouteau County MT
- Deer Lodge County MT
- Fergus County MT
- Gallatin County MT
- Golden Valley County MT
- Granite County MT
- Hill County MT
- Jefferson County MT
- Judith Basin County MT
- Lewis and Clark County MT
- Liberty County MT
- Madison County MT
- Meagher County MT
- Mineral County MT
- Missoula County MT
- Musselshell County MT
- Park County MT
- Phillips County MT
- Pondera County MT
- Powell County MT
- Ravalli County MT
- Rosebud County MT
- Sanders County MT
- Silver Bow County MT
- Stillwater County MT
- Sweet Grass County MT
- Teton County MT
- Valley County MT
- Wheatland County MT
- Yellowstone County MT
- Park County WY
- Teton County WY
The utility listed these 38 counties on Form EIA-861. A utility can serve only a part of a county on its list.
Other utilities in Montana
Form EIA-861, 2024
| Utility | Type | Residential customers | Average price cents per kWh | Average bill dollars per month | SAIDI minutes, with major event days | SAIDI minutes, without major event days | |
|---|---|---|---|---|---|---|---|
| Flathead Electric Coop Inc | Electric cooperative | 63,317 | 9.67 | $116.16 | 586.4 | 235.2 | Add |
| Yellowstone Valley Elec Co-op | Electric cooperative | 21,182 | 13.35 | $120.60 | n/a | n/a | Add |
| USBIA-Mission Valley Power | Federal power agency | 16,292 | 8.91 | $116.92 | n/a | n/a | Add |
| Missoula Electric Coop, Inc | Electric cooperative | 14,732 | 10.50 | $113.02 | 1,606.3 | 505.9 | Add |
| Fergus Electric Coop, Inc | Electric cooperative | 6,682 | 15.52 | $124.30 | 1,238.9 | 443.9 | Add |
| Lower Yellowstone R E A, Inc | Electric cooperative | 4,298 | 8.86 | $107.16 | 77.8 | 77.8 | Add |
All utilities in Montana, Investor-owned utilities in the US
Watch or compare this utility
The watch list and the compare list stay in this browser. Feed of changes: changes in Montana (RSS).
Official channels
- Montana Public Service CommissionThe home page of the state utility commission of Montana.
- Wyoming Public Service CommissionThe home page of the state utility commission of Wyoming.
- LIHEAP Clearinghouse: energy assistance office searchThe search page for local offices of the federal Low Income Home Energy Assistance Program (LIHEAP).
- EIA: Form EIA-861 annual data filesThe page of the annual files: revenue, sales, customers, reliability and service territories of each utility.
- EIA: Form EIA-861M monthly data filesThe page of the monthly files: the figures of each state and of the monthly sample of utilities.
EIA's files have no website for a utility. The state utility commission and the utility have the rate schedules.
Cite this page
Power Bill Facts. NorthWestern Energy LLC: average electricity price and bill. https://powerbillfacts.com/utility/northwestern-energy-llc-mt-12825/ Source: U.S. Energy Information Administration, Form EIA-861 (2024) and Form EIA-861M. Data through . Page made .
Where the figures come from
Source: U.S. Energy Information Administration. Annual figures: Form EIA-861, final release for 2024, respondent "NorthWestern Energy LLC - (MT)", utility number 12825. Monthly figures of the utility: Form EIA-861M sample. State and US averages: Form EIA-861M sales and revenue workbook, through July 2026. These are US government works in the public domain. An error in the processing of this site is corrected at the next build: report an error.
Questions about NorthWestern Energy LLC
- How does the price of NorthWestern Energy LLC compare with other utilities?
- In 2024, 63% of the 1,230 US utilities with a price had this price or a lower price. In Montana, 8 of the 9 other utilities with a price had a lower price.
- Did the price of NorthWestern Energy LLC change?
- The average residential price was 14.61 cents per kWh in 2023 and 14.23 cents per kWh in 2024. The 2024 price was 0.38 cents per kWh lower than the 2023 price. In 2019, the price was 12.01 cents per kWh. These prices are not adjusted for inflation.
- How many minutes without power did NorthWestern Energy LLC report?
- NorthWestern Energy LLC reported 233.4 minutes (about 4 hours) without power for each customer in 2024, with major event days. Without major event days, the figure was 117.9 minutes (about 2 hours). EIA's name for this figure is SAIDI. The utility also reported 1.30 interruptions for each customer, with major event days (SAIFI).
- Which counties does NorthWestern Energy LLC serve?
- NorthWestern Energy LLC listed 38 counties in 2 states in its service territory on Form EIA-861 for 2024. This page has the full list. A utility can serve only a part of a county.