US Power Grid Quality

Real-time voltage quality and outage risk by state

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National Average
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Voltage Quality
States Monitored
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Active Utilities
Average Risk
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Outage Risk (CPQI)
Last Update
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UTC Time
⚠️ ACTIVE POWER OUTAGES DETECTED
0 Customers Without Power
0 States Affected

US Power Grid Interconnections

The US has 3 separate power grids that operate independently
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Eastern – 28 states, largest grid
Western – 11 states + parts of Canada/Mexico
ERCOT – Texas only, isolated grid
Energie Eastern Interconnection
Normal
60.000
Hz
Deviation: +0.000 Hz States: 28
Energie Western Interconnection
Normal
60.000
Hz
Deviation: +0.000 Hz States: 11
Energie ERCOT (Texas)
Normal
60.000
Hz
Deviation: +0.000 Hz Isolated Grid
Grid Frequency Data: FNET/GridEye (University of Tennessee) | Normal: 59.95 - 60.05 Hz | Emergency: < 59.85 Hz
Chart Grid Frequency History (24 Hours)
Eastern Interconnection 28 States
Western Interconnection 11 States
ERCOT (Texas) Isolated Grid
Frequency data points every 15 minutes | Nominal: 60.000 Hz | Green zone: ±0.02 Hz
Erfolg Best Performing Utilities
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⚠️ Utilities Needing Attention
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Analyse Regional Statistics
Northeast
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NY, PA, MA, CT, NJ
Southeast
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FL, GA, NC, SC, VA
Midwest
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IL, OH, MI, IN, MN
Southwest
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TX, AZ, NM, NV
West Coast
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CA, OR, WA
Mountain
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CO, UT, MT, ID, WY

Voltage Quality by State

Excellent (90%+)
Good (75-90%)
Fair (50-75%)
Poor (25-50%)
Critical (<25%)
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Utility Details

-- utilities
State Utility / Region Interconnection Voltage Quality CPQI Risk THD Issues Status
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ℹ️ About the Metrics
Voltage Quality

Calculated as 100 minus CPQI×5. Higher is better. Excellent ≥90%, Good ≥75%, Fair ≥50%, Poor <50%.

CPQI (Consumer Power Quality Index)

Measures percentage of homes experiencing voltage irregularities. Lower is better. Values above 5% indicate significant issues.

Grid Frequency

US grid operates at 60 Hz. Deviations ±0.02 Hz are normal. Below 59.85 Hz indicates emergency conditions requiring load shedding.

Interconnections

US has 3 main grids: Eastern (28 states), Western (11 states), and ERCOT (Texas only). Each operates independently with own frequency.

Frequently asked questions

How does US power grid quality vary by state?

The map ranks each US state's voltage quality on a 0–100 scale — Excellent (90% or more), Good (75% or more), Fair (50% or more) or Poor (below 50%) — derived from the Consumer Power Quality Index (CPQI), the share of homes experiencing voltage irregularities.

What are the three US power grid interconnections?

The United States runs three independent grids: the Eastern Interconnection (28 states), the Western Interconnection (11 states plus parts of Canada and Mexico) and ERCOT, which serves Texas as an isolated grid — each with its own 60 Hz frequency.

When is US grid frequency considered an emergency?

The US grid runs at a nominal 60 Hz; deviations within ±0.02 Hz are normal, while a frequency below 59.85 Hz signals emergency conditions that can require load shedding.

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