For eighteen months the consensus story on US data center capex was that the binding constraint was chip supply — specifically advanced accelerator packaging. That constraint has eased. The new binding constraint is power. Grid interconnection queues at ERCOT, PJM and MISO are years long, and the marginal AI training site is being sited on the basis of power availability, not silicon availability.
Key takeaways
- Grid interconnection is now the binding constraint on new data centers.
- Interconnection queues at major ISOs are multi-year.
- Behind-the-meter gas and nuclear deals have proliferated.
- The utility sector is a structural beneficiary.
Why the constraint shifted
Chip supply has ramped as advanced packaging capacity has expanded. Power generation and grid infrastructure have not. Grid expansion is a decade-long process.
- Chip supply: catching up
- Grid interconnection: multi-year queue
- Behind-the-meter power: proliferating
- Nuclear restart interest: material
What behind-the-meter deals imply
Direct hyperscaler-to-generator contracts remove interconnection queue risk but concentrate power on individual sites. That has grid stability and equity implications.
Where the utility sector benefits
Any utility with sited capacity and near-term interconnection ability now trades at a premium.
What could accelerate the resolution
Federal permitting reform on grid interconnection would unlock a large share of the queue. Without it, the constraint compounds.
AI capex — binding constraint by year
| Period | Binding constraint |
|---|---|
| 2023-24 | Advanced chips |
| 2025 | Chips + power (transition) |
| 2026 | Power |
The AI capex bottleneck has moved from the fab to the substation.
Frequently asked questions
Are chips no longer constrained?
Constrained but less binding than power.
What is the workaround?
Behind-the-meter generation.
Who is the biggest structural beneficiary?
US utilities with sited generation.
The bottom line
The binding constraint on US AI capex is now the grid. That is a durable, decade-long problem, not a cyclical one.
