WECC's tightest market shows 22.5 constraint index; SPP rural Kansas matches excess-power score but operates under different interconnection risk profiles. Capacity planners face divergent timelines.
## Highlights
Cheyenne, Wyoming and Rural SPP both rank among the top three US build markets by excess-power availability—Cheyenne at 69.5/100, Rural SPP at 67.2/100. Yet their constraint indices reveal a critical divergence: Cheyenne's constraint index stands at 22.5, the tightest grip on grid access in WECC, while Rural SPP's constraint profile operates under SPP's historically longer interconnection review cycle. Both markets offer comparable headroom; the build decision hinges on time-to-power tolerance.
## What It Means
Capacity planners evaluating equivalent excess-power scores must now factor regional grid-approval velocity into site selection. A Cheyenne facility may see faster interconnection validation but higher per-MW constraint cost; Rural SPP offers looser near-term constraint pressure but requires longer lead-time assumptions. For a 100–500 MW deployment with a 24–36 month energization target, Rural SPP's lower constraint index (relative to WECC's tighter profile) may offset SPP's slower queue processing. Conversely, a sub-18-month power requirement favors Cheyenne despite its tighter constraint band.
## Second-Order Read
The persistence of both markets at nearly identical excess-power levels, coupled with their divergent constraint profiles, signals that regional grid modernization is now the primary site-selection variable for power-constrained AI infrastructure. Investors can no longer rely solely on excess-capacity rankings; interconnection timelines and regional queue velocity have become as material to capex phasing as power price. This reframes the "top build market" conversation from aggregate headroom to risk-adjusted time-to-revenue.
## Methodology
Excess-Power Index measures available grid capacity relative to peak demand and historical utilization (0–100 scale, 70+ = strong headroom). Constraint Index measures near-term grid access friction (0–100 scale; lower = faster access, higher = queued or constrained conditions). Both are updated daily across 280+ US and global markets.
Source: DC Hub Data Center Power Index (https://dchub.cloud/dcpi). Updated daily.
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