Cooperative · Maryland · EIA 17637
Southern Maryland Elec Coop Inc
Cooperative · Maryland · 171K customers. According to the U.S. Energy Information Administration's EIA Form 861, reliability for 2023 shows SAIDI 201 minutes/customer.
Reliability verdict
Southern Maryland Elec Coop Inc shows near-benchmark chronic reliability in 2023: 103 minutes SAIDI excluding major events across 171K customers.
- 201 min
- SAIDI 2023
- 1.33
- SAIFI 2023
- 103 min
- SAIDI ex-MED
- 171K
- Customers
Chronic reliability judged on SAIDI excluding major event days when reported (IEEE 1366). Source: EIA Form 861 · August 2026.
Signature read: mid-cohort SAIDI between the 96 and 258 minute tercile cuts.
What mid-pack Southern Maryland Elec Coop Inc filings show
Southern Maryland Elec Coop Inc is a member-owned electric cooperative operating in Maryland under EIA identifier 17637. It reports service to approximately 171,460 customer accounts and generated about $0.42 billion in annual electric revenue, with a service footprint spanning 73 ZIP codes. Being member-owned, this cooperative answers to its ratepayers rather than outside shareholders, a structure that tends to influence how rate cases and capital spending get decided.
In 2023, the average Southern Maryland Elec Coop Inc customer experienced 201.1 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. The SAIFI figure, which tracks average outage events per customer, came in at 1.33 for the same period, meaning customers statistically saw about 1 distinct interruption that year. Excluding major event days (hurricanes, ice storms), SAIDI drops to 102.8 minutes, the gap between that figure and the headline 201.1 reveals how much weather, not day-to-day infrastructure, drove outages.
Southern Maryland Elec Coop Inc has 4 years of continuous EIA reporting on file (2020–2023), enough to read a real trend rather than a single-year snapshot. SAIDI dropped from 222.9 to 201.1 minutes across that span, a direction regulators and prospective customers tend to watch closely.
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.
201 minutes per customer per year
Annual minutes without electric service (2023)
SAIDI by year (2020-2023)
Minutes per customer-year · EIA Form 861
Year-by-year SAIDI for Southern Maryland Elec Coop Inc from the same EIA filings as the table below. Lower is better; major-event years can spike the headline figure.
Southern Maryland Elec Coop Inc SAIDI trend
Southern Maryland Elec Coop Inc vs the nationwide SAIDI distribution
Where this utility's headline SAIDI sits among every EIA Form 861 utility with a reported figure
201 Around the middle fewer outage minutes than 42% 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 Southern Maryland Elec Coop Inc sits on price vs. reliability
Among the 781 U.S. utilities large enough to report both revenue per customer and a recent outage record, Southern Maryland Elec Coop Inc charges more per customer than 46% of them, and is more reliable (lower SAIDI) than 46% of them, placing it in the quadrant where it pays less and is less reliable. Revenue per customer and outage minutes are independent figures: paying more does not guarantee fewer outages.
Revenue per customer: $2,475/year · Latest SAIDI: 201.1 minutes/year.
SAIDI 2023 breakdown: 201.1 minutes
Reliability Trend (2020–2023)
| Year | SAIDI (min) | SAIDI nMED | SAIFI | Customers |
|---|---|---|---|---|
| 2020 | 222.9 | 148.8 | 1.550 | - |
| 2021 | 162.2 | 120.0 | 1.560 | 169,190 |
| 2022 | 492.8 | 117.0 | 1.960 | 171,858 |
| 2023 | 201.1 | 102.8 | 1.330 | 174,909 |
SAIDI nMED = SAIDI without major event days. Source: EIA Form 861.
Service Area
Southern Maryland Elec Coop Inc serves 73 ZIP codes in Maryland.
Frequently Asked Questions
How reliable is Southern Maryland Elec Coop Inc?
Southern Maryland Elec Coop Inc had a SAIDI of 201.1 minutes in 2023. Leaving aside major weather events, that figure sits close to the national average.
What type of utility is Southern Maryland Elec Coop Inc?
Southern Maryland Elec Coop Inc is classified as a Cooperative serving Maryland.
How many customers does Southern Maryland Elec Coop Inc serve?
Southern Maryland Elec Coop Inc serves approximately 171,460 customers in Maryland.
How has Southern Maryland Elec Coop Inc's reliability changed over time?
Southern Maryland Elec Coop Inc has 4 years of reliability data (2020-2023). This utility's SAIDI has stayed fairly flat over the period. Review the trend table above for year-by-year detail.
Utility Profile
- Type
- Cooperative
- State
- Maryland
- Customers
- 171,460
- Annual Revenue
- $0.42B
- EIA ID
- 17637
Explore
Utilities with similar EIA profiles
Two cross-state peer sets for Southern Maryland Elec Coop Inc. 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 (171K here), outside Maryland.
Similar chronic SAIDI
Nearest utilities by latest SAIDI minutes (201.1 here), outside Maryland, 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.