IOU · Vermont · EIA 7601
Green Mountain Power Corp
IOU · Vermont · 273K customers. According to the U.S. Energy Information Administration's EIA Form 861, reliability for 2023 shows SAIDI 782 minutes/customer.
Reliability verdict
Green Mountain Power Corp shows near-benchmark chronic reliability in 2023: 224 minutes SAIDI excluding major events (782 minutes including them) across 273K customers.
- 782 min
- SAIDI 2023
- 2.51
- SAIFI 2023
- 224 min
- SAIDI ex-MED
- 273K
- Customers
Chronic reliability judged on SAIDI excluding major event days when reported (IEEE 1366). Source: EIA Form 861 · August 2026.
Signature read: long interruption minutes vs the 911 utility cohort (>258 min tercile cut).
What long-outage Green Mountain Power Corp filings show
Green Mountain Power Corp is an investor-owned utility operating in Vermont under EIA identifier 7601. It reports service to approximately 273,285 customer accounts and generated about $0.70 billion in annual electric revenue, with a service footprint spanning 225 ZIP codes. Because it is investor-owned, the state public utility commission oversees its rate cases and reliability performance rather than a local board.
In 2023, the average Green Mountain Power Corp customer experienced 782.4 minutes of power interruptions, a measure known as SAIDI, or System Average Interruption Duration Index. Excluding major weather events from that total, that falls inside the typical 120–180 minute national benchmark, in line with what most U.S. distribution utilities report. The SAIFI figure, which tracks average outage events per customer, came in at 2.51 for the same period, meaning customers statistically saw about 3 distinct interruptions that year. Strip out major event days (hurricanes, ice storms) and SAIDI falls to 223.8 minutes; the difference from the headline 782.4 shows how much of the outage total came from weather rather than everyday grid issues.
Green Mountain Power Corp has 4 years of continuous EIA reporting on file (2020–2023), enough to read a real trend rather than a single-year snapshot. SAIDI climbed from 270.0 to 782.4 minutes over that window, a shift that can point to worsening weather exposure or delayed grid modernization.
Based on this utility's own EIA Form 861 reliability record -- baseline (major-event- excluded) outage duration, total outage duration, and outage frequency -- each benchmarked against every reporting utility nationwide. Not a measure of electricity rates or customer service, which this portal does not track.
782 outage minutes per customer annually
Minutes without power per year (2023)
SAIDI by year (2020-2023)
Minutes per customer-year · EIA Form 861
Year-by-year SAIDI for Green Mountain Power Corp from the same EIA filings as the table below. Lower is better; major-event years can spike the headline figure.
Green Mountain Power Corp SAIDI trend
Green Mountain Power Corp vs the nationwide SAIDI distribution
Where this utility's headline SAIDI sits among every EIA Form 861 utility with a reported figure
782 Higher than most fewer outage minutes than 9% of 911 utilities
Utilities nationwide, banded by latest reported SAIDI (minutes)
Each bar is a band; taller bars hold more utilities. The dashed line + filled bar mark this entry. Hover or tap any bar for its full count and share, and where it sits relative to this entry.
Source U.S. EIA Form 861 reliability filings · August 2026
Price vs. reliability
Where Green Mountain Power Corp sits on price vs. reliability
Among the 781 U.S. utilities large enough to report both revenue per customer and a recent outage record, Green Mountain Power Corp charges more per customer than 52% of them, and is more reliable (lower SAIDI) than 11% of them, placing it in the quadrant where it pays more but is LESS reliable, a premium price without a reliability payoff. Revenue per customer and outage minutes are independent figures: paying more does not guarantee fewer outages.
Revenue per customer: $2,563/year · Latest SAIDI: 782.4 minutes/year.
SAIDI 2023 breakdown: 782.4 minutes
Reliability Trend (2020–2023)
| Year | SAIDI (min) | SAIDI nMED | SAIFI |
|---|---|---|---|
| 2020 | 270.0 | 270.0 | 1.970 |
| 2021 | 327.6 | 269.4 | 2.250 |
| 2022 | 970.8 | 280.8 | 2.770 |
| 2023 | 782.4 | 223.8 | 2.510 |
SAIDI nMED = SAIDI without major event days. Source: EIA Form 861.
Service Area
Green Mountain Power Corp serves 225 ZIP codes in Vermont.
Frequently Asked Questions
How reliable is Green Mountain Power Corp?
Green Mountain Power Corp had a SAIDI of 782.4 minutes in 2023 including major weather events, but 223.8 minutes excluding them (the industry-standard measure of routine reliability, so the gap traces back to a major storm that year, not a chronic issue). Excluding major weather events, this is near the national average.
What type of utility is Green Mountain Power Corp?
Green Mountain Power Corp is classified as a IOU serving Vermont.
How many customers does Green Mountain Power Corp serve?
Green Mountain Power Corp serves approximately 273,285 customers in Vermont.
How has Green Mountain Power Corp's reliability changed over time?
Green Mountain Power Corp has 4 years of reliability data (2020-2023). SAIDI has held roughly steady across these years. Review the trend table above for year-by-year detail.
Utility Profile
- Type
- IOU
- State
- Vermont
- Customers
- 273,285
- Annual Revenue
- $0.70B
- EIA ID
- 7601
Explore
Utilities with similar EIA profiles
Two cross-state peer sets for Green Mountain Power Corp. Same-state SAIDI neighbors stay in Read-with below; these neighborhoods are nearest other-state utilities with at least 10,000 reported customers.
Similar customer count
Nearest utilities by Form 861 customers (273K here), outside Vermont.
Similar chronic SAIDI
Nearest utilities by latest SAIDI minutes (782.4 here), outside Vermont, excluding the customer-peer set.
Source: U.S. Energy Information Administration Form 861 annual electric power industry survey · ZIP service territory: OpenEI. Disclaimer: informational only, not professional advice. See full disclaimer · methodology.