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What You're Noticing

Why Do My Lights Flicker?

Noticing more brownouts, dimming lights, or power outages? You may be experiencing the effects of a grid under increasing stress from data center demand.

4 min read

Key Takeaways

  • 1 Flickering lights and brownouts signal a grid running near its capacity limits
  • 2 Data centers add constant, massive demand that eliminates traditional grid slack
  • 3 PJM capacity prices rose 1,100% from 2024 to 2026 as reserve margins shrink

Something's Different

Lights dimming when the AC kicks on. Clocks resetting. More outages than you remember. Across the country, grid operators warn that power reliability is getting harder to maintain.

Voltage Sags
Lights dim, motors slow
Brownouts
Intentional voltage cuts

The Data Center Connection

Data centers add enormous, concentrated demand to the same grid serving your home.

Power Comparison
1 GW
Large AI data center
=
750,000
Homes
Running 24/7/365 at near-maximum capacity

Unlike residential demand that peaks in evenings, data centers run constantly. This eliminates the "slack" that traditionally protected grids during emergencies.

What Grid Operators Are Saying

PJM Interconnection 13 states + D.C. | 65M people
7
Energy Emergencies (2024)
1,100%
Capacity Price Increase
$329
Per MW-day (2026/27)

Up from $28.92/MW-day in 2024/25

ERCOT
Texas
Tight margins
MISO
Midwest
Capacity concerns
CAISO
California
Demand growth

For more on how the grid operates, see How the Electric Grid Works

Next Steps

  1. Document issues with dates, times, and what you observed
  2. Report to your utility - they track patterns from multiple reports
  3. Check our state database for data center projects near you
Take Action The Power Constraint

Go Deeper

Chapter 5 of This Is Server Country examines how the electric grid works, why it wasn't designed for this kind of demand growth, and what the implications are for reliability and cost.

Learn more about the book