SAIDI
112 min per year
Average outage minutes (2023)
What This Utility Data Tells You
Montana-Dakota Utilities Co is a investor-owned utility operating in Montana under EIA identifier 12199. It reports service to approximately 93,947 customer accounts and generated about $0.23 billion in annual electric revenue, with a service footprint spanning 179 ZIP codes. As an investor-owned utility, it operates under state public utility commission oversight that reviews rate cases and reliability performance.
In 2023, the average Montana-Dakota Utilities Co customer experienced 112.4 minutes of power interruptions — a metric called SAIDI (System Average Interruption Duration Index). That sits within the 120–180 minute national benchmark range, indicating performance typical of U.S. distribution utilities. SAIFI — the average number of outage events per customer — was 1.29 for the same period, so customers statistically faced roughly 1 distinct interruption that year.
The EIA dataset includes 4 years of continuous reporting (2020–2023) for Montana-Dakota Utilities Co, which lets you see whether reliability is trending up or down rather than judging from a single snapshot. SAIDI has improved from 137.2 to 112.4 minutes over that window — a meaningful direction for prospective customers and regulators watching capital investment outcomes. All figures on this page come directly from EIA Form 861, the federal annual electric power industry survey, with service territory ZIPs sourced from OpenEI — you can cross-reference them with your own utility bill or use them when comparing providers before relocating.
SAIFI
1.29 interruptions/yr
Outage frequency (2023)
Customers
93,947
Served in Montana
SAIDI vs. National Average (180 min) 28.1%
112 minutes per customer per year
Minutes without power per year (2023)
Reliability Trend (2020–2023)
| Year | SAIDI (min) | SAIDI nMED | SAIFI | Customers |
|---|---|---|---|---|
| 2020 | 137.2 | — | 1.684 | — |
| 2021 | 685.1 | — | 3.100 | — |
| 2022 | 120.7 | — | 1.204 | — |
| 2023 | 112.4 | — | 1.287 | — |
SAIDI nMED = SAIDI without major event days. Source: EIA Form 861.
Service Area
Montana-Dakota Utilities Co serves 179 ZIP codes in Montana.
5740157428574375744157442574485745057451574525745557456574665747157472574735747557481576015763157632576405764557646576485765857724584135842858433584365843958440584415845658460584825848758495585015850258503585045850558506585075852058521585235852458529585305853258533585415854258544585455854958552585545855858560585615856258563585685857258573585805858158601586025862158622586235862558626586305863158632586365863858639586405864358646586475864958650586515865258653586545865558656587185872158725587275873058734587375874658752587555876158765587695877258773587765878258784587875879458795588015880258830588315883358835588385884358844588455884958852588545885659201592125921359215592175921859219592215922559226592425924359247592485925459255592585925959262592705927459301593125931359315593245932659327593305933359336593385933959341593445934559347593495935359354828018283282833828348283682838828398284282844
Frequently Asked Questions
How reliable is Montana-Dakota Utilities Co?
Montana-Dakota Utilities Co had a SAIDI of 112.4 minutes in 2023, meaning the average customer experienced about 112 minutes of outages that year. This is near the national average.
What type of utility is Montana-Dakota Utilities Co?
Montana-Dakota Utilities Co is classified as a IOU serving Montana. Investor-owned utilities (IOUs) are for-profit companies regulated by state public utility commissions.
What does SAIDI mean for Montana-Dakota Utilities Co?
SAIDI (System Average Interruption Duration Index) measures the average total minutes per year that a customer of Montana-Dakota Utilities Co experiences power outages. A lower SAIDI indicates better reliability. The national average is roughly 120-180 minutes per year, so comparing Montana-Dakota Utilities Co's SAIDI to that benchmark shows whether this utility is above or below average.
How many customers does Montana-Dakota Utilities Co serve?
Montana-Dakota Utilities Co serves approximately 93,947 customers in Montana. Customer count can affect reliability metrics because larger utilities may face different infrastructure challenges compared to smaller ones.
How has Montana-Dakota Utilities Co's reliability changed over time?
Montana-Dakota Utilities Co has 4 years of reliability data (2020-2023). SAIDI has remained relatively stable over this period. Review the trend table above for year-by-year detail.
What is SAIDI without major event days?
SAIDI "without major event days" (SAIDI nMED) excludes outages caused by hurricanes, ice storms, and other catastrophic weather events. It better reflects day-to-day infrastructure reliability rather than vulnerability to extreme weather. Both standard SAIDI and SAIDI nMED are shown in the reliability trend table above.
Utility Profile
- Type
- IOU
- State
- Montana
- Customers
- 93,947
- Annual Revenue
- $0.23B
- EIA ID
- 12199
Related Data
Guides
Data Source: U.S. Energy Information Administration Form 861 annual electric power industry survey. ZIP service territory from OpenEI.
Related
Data sourced from official EIA reliability statistics and OpenEI utility rate database. See our methodology for details. Retrieved and formatted by PlainUtility Editorial
Disclaimer: This information is provided for informational purposes only and does not constitute professional advice. Data is sourced from the U.S. Energy Information Administration (EIA) Form 861. Consult a qualified professional before making decisions based on this data.
Read our methodology — how this data is sourced, computed, and verified.