National median summer peak demand rose 42% from 822 MW in 2008 to 1,168 MW in 2024. This growth reflects population and economic growth, early stages of electrification adding EV charging and heat pump load, and extraordinary data center demand growth particularly in Virginia, Georgia, and Texas. Winter peaks are rising faster than summer peaks — narrowing the seasonal gap as heating electrification spreads.
Peak demand is the primary driver of T&D capital investment. A utility whose peak grew 50% in 15 years needs 50% more capacity, translating directly into rate base growth and rate increases. The peak demand trajectory is a leading indicator of future capital expenditure and rate pressure.
| Utility | St | Summer Peak (MW) | Winter Peak (MW) | Summer/Winter Ratio | Change 2008→2024 |
|---|
| Year | Value 1 | Value 2 |
|---|---|---|
| 2024 | — | — |
| 2023 | — | — |