Municipal · Massachusetts · EIA 20310
Town of Wellesley - (MA)
Municipal · Massachusetts · 11K customers. According to the U.S. Energy Information Administration's EIA Form 861, reliability for 2023 shows SAIDI 39 minutes/customer.
Reliability verdict
Town of Wellesley - (MA) shows above-average chronic reliability in 2023: 39 minutes SAIDI across 11K customers.
- 39 min
- SAIDI 2023
- 0.63
- SAIFI 2023
- 11K
- Customers
Chronic reliability judged on SAIDI excluding major event days when reported (IEEE 1366). Source: EIA Form 861 · August 2026.
Signature read: short interruption minutes vs the 911 utility cohort (≤96 min tercile cut).
What short-outage Town of Wellesley - (MA) filings show
Town of Wellesley - (MA) is a municipally-owned utility operating in Massachusetts under EIA identifier 20310. It reports service to approximately 10,596 customer accounts and generated about $0.04 billion in annual electric revenue, with a service footprint spanning 11 ZIP codes. As a municipal utility, it is typically governed by a local board or city council and is exempt from federal income tax.
In 2023, the average Town of Wellesley - (MA) customer experienced 38.5 minutes of power interruptions, a metric called SAIDI (System Average Interruption Duration Index). That is comfortably under the 120–180 minute national benchmark range, a sign of solid grid resilience and quick outage response. SAIFI, the average number of outage events per customer, was 0.63 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 Town of Wellesley - (MA), which lets you see whether reliability is trending up or down rather than judging from a single snapshot. Over that span, SAIDI rose from 31.0 to 38.5 minutes, possibly reflecting tougher weather years or grid upgrades that have not caught up yet.
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.
39 minutes per customer per year
Minutes without power per year (2023)
SAIDI by year (2020-2023)
Minutes per customer-year · EIA Form 861
Year-by-year SAIDI for Town of Wellesley - (MA) from the same EIA filings as the table below. Lower is better; major-event years can spike the headline figure.
Town of Wellesley - (MA) SAIDI trend
Town of Wellesley - (MA) vs the nationwide SAIDI distribution
Where this utility's headline SAIDI sits among every EIA Form 861 utility with a reported figure
39 Among the lowest fewer outage minutes than 87% 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 Town of Wellesley - (MA) sits on price vs. reliability
Among the 781 U.S. utilities large enough to report both revenue per customer and a recent outage record, Town of Wellesley - (MA) charges more per customer than 89% of them, and is more reliable (lower SAIDI) than 90% of them, placing it in the quadrant where it pays more and is more reliable. Revenue per customer and outage minutes are independent figures: paying more does not guarantee fewer outages.
Revenue per customer: $3,553/year · Latest SAIDI: 38.5 minutes/year.
Reliability Trend (2020–2023)
| Year | SAIDI (min) | SAIFI |
|---|---|---|
| 2020 | 31.0 | 0.493 |
| 2021 | 24.9 | 0.479 |
| 2022 | 31.7 | 0.700 |
| 2023 | 38.5 | 0.633 |
Service Area
Town of Wellesley - (MA) serves 11 ZIP codes in Massachusetts.
Frequently Asked Questions
How reliable is Town of Wellesley - (MA)?
Town of Wellesley - (MA) had a SAIDI of 38.5 minutes in 2023. Leaving aside major weather events, that figure comes in under the national average, pointing to above-average reliability.
What type of utility is Town of Wellesley - (MA)?
Town of Wellesley - (MA) is classified as a Municipal serving Massachusetts.
How many customers does Town of Wellesley - (MA) serve?
Town of Wellesley - (MA) serves approximately 10,596 customers in Massachusetts.
How has Town of Wellesley - (MA)'s reliability changed over time?
Town of Wellesley - (MA) 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.
Utility Profile
- Type
- Municipal
- State
- Massachusetts
- Customers
- 10,596
- Annual Revenue
- $0.04B
- EIA ID
- 20310
Explore
Utilities with similar EIA profiles
Two cross-state peer sets for Town of Wellesley - (MA). 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 (11K here), outside Massachusetts.
Similar chronic SAIDI
Nearest utilities by latest SAIDI minutes (38.5 here), outside Massachusetts, 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.