EIA Form 861 · 2022→2023

Which utilities got less reliable?

Year-over-year change in SAIDI without major event days (IEEE chronic reliability), among utilities with at least 10,000 customers. Higher minutes = more outage time.

Worsening board → All rankings

This list, in one line

Eastern Maine Electric Coop posted the largest chronic-reliability worsening among 548 utilities with ≥10,000 customers from 2022 to 2023: +1521.6 min on SAIDI-nMED. The #50 cutoff on this worsening board is +66.6 min.

+1521.6 min
#1 worsening · Eastern Maine Electric Coop
+66.6 min
#50, the cutoff to make this list
-1751.5 min
Largest improvement · City of Brookings - (SD)
548
Utilities in the paired pool

EIA Form 861 reliability filings. SAIDI-nMED excludes major-event days so one-off storms do not dominate the ranking. Floor: ≥10,000 customers and prior-year SAIDI-nMED ≥10 minutes.

Largest SAIDI-nMED worsenings

Minutes-per-customer increase from 2022 to 2023. Positive = more outage time.

1. Eastern Maine Electr…1521.63 min2. Buckeye Rural Elec C…978.47 min3. Navasota Valley Elec…687.18 min4. Delta Electric Power…591.5 min5. Farmers Rural Electr…423.56 min6. Garkane Energy Coop,…403.7 min7. Grady Electric Membe…306.76 min8. Craighead Electric C…260.37 min9. Heart of Texas Elect…257.9 min10. Big Sandy Rural Elec…248.03 min11. Cullman Electric Coo…205.78 min12. Holmes-Wayne Electri…193.14 min

Top 50: largest worsenings

Utility Δ SAIDI-nMED
  1. 1 Eastern Maine Electric Coop ME · 953.5 min → 2475.1 min +1521.6 min
  2. 2 Buckeye Rural Elec Coop, Inc OH · 729.9 min → 1708.4 min +978.5 min
  3. 3 Navasota Valley Elec Coop, Inc TX · 392.6 min → 1079.7 min +687.2 min
  4. 4 Delta Electric Power Assn MS · 477.9 min → 1069.3 min +591.5 min
  5. 5 Farmers Rural Electric Coop Corp - (KY) KY · 115.7 min → 539.3 min +423.6 min
  6. 6 Garkane Energy Coop, Inc UT · 362.3 min → 766.0 min +403.7 min
  7. 7 Grady Electric Membership Corp GA · 196.2 min → 503.0 min +306.8 min
  8. 8 Craighead Electric Coop Corp AR · 160.4 min → 420.8 min +260.4 min
  9. 9 Heart of Texas Electric Coop TX · 94.8 min → 352.7 min +257.9 min
  10. 10 Big Sandy Rural Elec Coop Corp KY · 634.8 min → 882.8 min +248.0 min
  11. 11 Cullman Electric Coop, Inc AL · 358.0 min → 563.8 min +205.8 min
  12. 12 Holmes-Wayne Electric Coop Inc OH · 373.9 min → 567.1 min +193.1 min
  13. 13 Kit Carson Electric Coop, Inc NM · 134.1 min → 316.0 min +181.9 min
  14. 14 Upshur Rural Elec Coop Corp TX · 702.0 min → 880.7 min +178.7 min
  15. 15 Gulf Coast Electric Coop, Inc FL · 435.4 min → 599.6 min +164.2 min
  16. 16 Tri-County Electric Coop, Inc (FL) FL · 190.8 min → 348.5 min +157.7 min
  17. 17 Kiamichi Electric Coop, Inc OK · 379.4 min → 535.4 min +155.9 min
  18. 18 Black River Electric Coop - (MO) MO · 356.9 min → 509.3 min +152.3 min
  19. 19 Southwest Arkansas E C C AR · 100.7 min → 251.7 min +151.0 min
  20. 20 Tri-County Elec Member Corp (TN) KY · 236.9 min → 383.4 min +146.5 min
  21. 21 City of Columbus - (OH) OH · 186.7 min → 325.9 min +139.3 min
  22. 22 South Alabama Elec Coop, Inc AL · 184.4 min → 322.5 min +138.1 min
  23. 23 Suwannee Valley Elec Coop Inc FL · 206.0 min → 340.0 min +134.0 min
  24. 24 Lyntegar Electric Coop, Inc TX · 129.1 min → 257.3 min +128.2 min
  25. 25 Singing River Elec Cooperative MS · 28.8 min → 151.1 min +122.3 min
  26. 26 Bartlett Electric Coop, Inc TX · 113.3 min → 234.4 min +121.1 min
  27. 27 Altamaha Electric Member Corp GA · 179.4 min → 299.6 min +120.2 min
  28. 28 City of Dickson TN · 252.2 min → 368.7 min +116.5 min
  29. 29 Powell Valley Electric Coop TN · 205.6 min → 316.7 min +111.1 min
  30. 30 City of Kinston - (NC) NC · 68.5 min → 179.6 min +111.0 min
  31. 31 Southwest Electric Coop, Inc MO · 111.0 min → 217.0 min +106.0 min
  32. 32 Okefenoke Rural El Member Corp FL · 174.8 min → 280.7 min +105.9 min
  33. 33 Central Alabama Electric Coop AL · 180.1 min → 283.9 min +103.8 min
  34. 34 City of Manassas - (VA) VA · 49.5 min → 153.2 min +103.7 min
  35. 35 Groton Dept of Utilities - (CT) CT · 17.1 min → 120.1 min +103.0 min
  36. 36 City of Claremore OK · 143.7 min → 243.0 min +99.3 min
  37. 37 Tipmont Rural Elec Member Corp IN · 79.8 min → 176.7 min +96.8 min
  38. 38 Coweta-Fayette El Member Corp GA · 109.4 min → 202.9 min +93.4 min
  39. 39 Crawford Electric Coop, Inc MO · 212.2 min → 303.9 min +91.7 min
  40. 40 Northcentral Mississippi E P A MS · 145.8 min → 232.8 min +87.0 min
  41. 41 PUD No 1 of Grays Harbor County WA · 169.0 min → 256.0 min +87.0 min
  42. 42 Sam Houston Electric Coop Inc TX · 250.0 min → 330.0 min +80.0 min
  43. 43 HILCO Electric Cooperative, Inc. TX · 58.0 min → 136.4 min +78.4 min
  44. 44 FreeState Electric Coop KS · 304.9 min → 381.9 min +76.9 min
  45. 45 City of Orangeburg - (SC) SC · 200.7 min → 275.1 min +74.4 min
  46. 46 Jemez Mountains Elec Coop, Inc NM · 569.8 min → 641.3 min +71.6 min
  47. 47 Southwest Tennessee E M C TN · 164.0 min → 234.4 min +70.4 min
  48. 48 Liberty Utilities (Granite State Electri NH · 84.3 min → 153.8 min +69.5 min
  49. 49 Medina Electric Coop, Inc TX · 193.8 min → 261.8 min +68.0 min
  50. 50 Glades Electric Coop, Inc FL · 308.9 min → 375.5 min +66.6 min

Top 50: largest improvements

Minutes-per-customer decrease from 2022 to 2023. Negative Δ = less outage time.

Utility Δ SAIDI-nMED
  1. 1 City of Brookings - (SD) SD · 1760.5 min → 9.0 min -1751.5 min
  2. 2 Guernsey-Muskingum El Coop Inc OH · 917.6 min → 380.1 min -537.5 min
  3. 3 Orcas Power & Light Coop WA · 1706.7 min → 1290.8 min -415.9 min
  4. 4 Wheeling Power Co WV · 928.5 min → 593.8 min -334.7 min
  5. 5 Randolph Electric Member Corp NC · 403.4 min → 123.3 min -280.1 min
  6. 6 Southwest Mississippi E P A MS · 1553.7 min → 1303.2 min -250.5 min
  7. 7 Sevier County Electric System TN · 458.0 min → 215.0 min -243.0 min
  8. 8 Liberty Utilities CA · 471.7 min → 264.6 min -207.0 min
  9. 9 South Kentucky Rural E C C KY · 458.0 min → 251.0 min -207.0 min
  10. 10 Baldwin County El Member Corp AL · 265.0 min → 66.6 min -198.4 min
  11. 11 Southeast Colorado Power Assn CO · 913.0 min → 717.5 min -195.5 min
  12. 12 Consumers Power, Inc OR · 470.0 min → 296.3 min -173.8 min
  13. 13 Southwestern Electric Coop Inc - (IL) IL · 431.6 min → 258.6 min -173.0 min
  14. 14 Kentucky Power Co KY · 490.6 min → 331.8 min -158.8 min
  15. 15 PUD No 1 of Jefferson County WA · 473.1 min → 316.4 min -156.7 min
  16. 16 Columbia Power System - (TN) TN · 331.0 min → 177.0 min -154.0 min
  17. 17 Cloverland Electric Co-op MI · 357.9 min → 213.8 min -144.1 min
  18. 18 City of Rockwood - (TN) TN · 219.8 min → 82.5 min -137.3 min
  19. 19 City of Cuyahoga Falls - (OH) OH · 178.8 min → 41.9 min -136.9 min
  20. 20 Lorain-Medina R E C, Inc OH · 261.4 min → 129.1 min -132.3 min
  21. 21 Town of High Point NC · 182.2 min → 65.8 min -116.4 min
  22. 22 Empire Electric Assn, Inc CO · 232.3 min → 116.4 min -115.9 min
  23. 23 Appalachian Power Co VA · 470.6 min → 356.6 min -114.0 min
  24. 24 Alger-Delta Coop Electric Assn MI · 222.4 min → 110.9 min -111.5 min
  25. 25 Entergy Arkansas LLC AR · 393.6 min → 284.7 min -108.9 min
  26. 26 Umatilla Electric Coop Assn OR · 153.0 min → 47.3 min -105.8 min
  27. 27 Kootenai Electric Cooperative ID · 203.4 min → 99.8 min -103.6 min
  28. 28 Kingsport Power Co TN · 290.6 min → 191.5 min -99.1 min
  29. 29 Upper Michigan Energy Resources Corp. MI · 286.0 min → 187.0 min -99.0 min
  30. 30 Jasper-Newton Elec Coop, Inc TX · 590.0 min → 496.1 min -94.0 min
  31. 31 Missoula Electric Coop, Inc MT · 257.1 min → 165.2 min -91.9 min
  32. 32 Victoria Electric Coop, Inc TX · 287.5 min → 197.3 min -90.2 min
  33. 33 North Arkansas Elec Coop, Inc AR · 255.3 min → 166.3 min -89.0 min
  34. 34 Northern Neck Elec Coop, Inc VA · 211.7 min → 128.8 min -82.9 min
  35. 35 Grayson Rural Electric Coop Corp KY · 375.7 min → 293.3 min -82.4 min
  36. 36 Barron Electric Coop WI · 245.8 min → 168.1 min -77.7 min
  37. 37 Carroll-White REMC IN · 322.8 min → 246.1 min -76.7 min
  38. 38 Utilities Dist-Western IN REMC IN · 346.5 min → 272.4 min -74.2 min
  39. 39 Tri-County Electric Coop (MI) MI · 185.0 min → 113.0 min -72.0 min
  40. 40 Riverland Energy Cooperative WI · 154.1 min → 82.1 min -72.0 min
  41. 41 Dunn County Electric Coop WI · 146.6 min → 78.5 min -68.1 min
  42. 42 South Central Indiana REMC IN · 326.2 min → 258.5 min -67.7 min
  43. 43 Alaska Electric Light & Power Co. AK · 140.3 min → 74.0 min -66.3 min
  44. 44 East Central Oklahoma Elec Coop Inc OK · 221.2 min → 157.1 min -64.1 min
  45. 45 Upper Peninsula Power Company MI · 204.6 min → 140.6 min -64.0 min
  46. 46 Flathead Electric Coop Inc MT · 222.9 min → 160.5 min -62.5 min
  47. 47 Duke Energy Indiana, LLC IN · 160.4 min → 98.0 min -62.4 min
  48. 48 Clark Energy Coop Inc - (KY) KY · 255.3 min → 193.8 min -61.5 min
  49. 49 Nantucket Electric Co MA · 105.5 min → 44.5 min -61.0 min
  50. 50 Appalachian Electric Coop TN · 250.0 min → 190.4 min -59.6 min

According to the U.S. Energy Information Administration (EIA), electric utilities publish SAIDI and SAIFI reliability metrics in Form 861 annual filings. Every figure on PlainUtility is rebuilt from those federal tables; no number is typed in by an editor. Adjacent-year SAIDI-nMED deltas are computed from two stored EIA Form 861 reliability filings per utility, never typed by an editor. See our editorial standards & corrections policy, the methodology behind these numbers, or report a data error.