Grid-constrained data center markets, ranked by ISO.
A market can be huge and still be a dead end for new power. What decides it is the grid: how saturated transmission is, how deep the interconnection queue runs, and how long until your load can energize. DC Hub ranks constraint across live grids on 5 continents (US ISOs, UK, EU, Taiwan, Japan, South Korea, Brazil, Australia) with live demand and fuel mix underneath — not a quarterly estimate.
live US ISOs — ERCOT, CAISO, NYISO, MISO, PJM, SPP, ISO-NE (+ modeled, not live: Hydro-Québec, AESO, Nord Pool)
15 min
refresh cadence on real-time demand & fuel mix — vs. the industry's quarterly cycle
126,427
substations mapped — the transmission layer the constraint score is built on
Grid-constrained data center markets, by grid operator
Data as of (latest DCPI computation). 236 of 334 DCPI markets are rated AVOID, DC Hub's grid-constrained verdict; the table below breaks them down by grid operator. Methodology: DCPI scores each market daily on an Excess Power score and a Grid Constraint score from ISO and utility grid data and interconnection queues, and assigns BUILD, CAUTION or AVOID. AVOID marks a market where transmission and queue constraint outweigh excess power.
Grid-constrained (AVOID) data center markets by grid operator, as of 2026-10-20
How to cite: DC Hub Data Center Power Index (DCPI), "Grid-constrained data center markets by grid operator", https://dchub.cloud/data-center-grid-constraint, data as of 2026-10-20. CC-BY-4.0.
Real-time demand is a recent snapshot from DC Hub's ISO feed. Constraint reflects transmission saturation, queue depth and time-to-power. The pattern is the whole story: the biggest, most-demanded grids (PJM) are the most constrained; the plains (SPP) and hydro-rich north (Hydro-Québec) have the headroom — which is exactly where DCPI's BUILD verdicts land.
ISO / operator
Region
Real-time demand
Constraint
Data-center read
PJM
Mid-Atlantic + Midwest
~92,669 MWh
HIGH
Columbus OH and Ashburn (NoVA) rated AVOID · multi-yr TTP
MISO
Midwest / Central
~92,867 MWh
RISING
Large load growing; pockets of headroom
ERCOT
Texas
~67,488 MWh
RISING
Large-load queue ~474 GW (June 2026), ~90% data centers; new 75 MW+ energization paused pending audit
SPP
Central plains
~41,284 MWh
LOW
Most scored markets rated BUILD
CAISO
California
~25,439 MWh
RISING
Renewables-rich but transmission-bound
NYISO
New York
~15,447 MWh
RISING
Downstate constrained; upstate has room
ISO-NE
New England
~13,021 MWh
HIGH
Winter-peaking, import-dependent, tight
Hydro-Québec
Québec, Canada
hydro surplus
LOW
Montréal rated BUILD
AESO
Alberta, Canada
live
RISING
Gas + wind; fast-track large-load interest
Nord Pool
Nordics (15 zones)
live
LOW
Cheap hydro/wind; Oslo/Helsinki headroom
Demand snapshots from EIA RTO data via the DC Hub ISO feed (refreshed every 15 min); MISO/ISO-NE show the latest available hourly print. Live JSON: /iso/ · PJM detail: /grid/pjm. Query live via compare_isos(isos="PJM,ERCOT,SPP").
PJM, the most-constrained major grid — by fuel
PJM is the largest US ISO (~150 GW peak) and carries the heaviest data-center queue. Its real-time generation mix shows why constraint is structural, not seasonal — a fossil-heavy baseload that's slow to expand into new large loads:
40,935
gas — MWh, real-time (largest single source)
31,171
nuclear — MWh, real-time baseload
16,959
coal — MWh, real-time
Live PJM fuel mix via DC Hub. The Columbus, OH market is rated AVOID by DCPI; Northern Virginia's Dominion zone is similarly saturated. See the full verdict table on the power-availability page.
What the constraint score actually measures
Transmission saturation
How loaded the existing lines are near candidate sites — built on 126,427 mapped substations and the transmission network. A saturated corridor means costly upgrades before energization.
Queue depth + DC share
How many GW are already queued ahead of you, and how much of it is data centers. ERCOT's ~474 GW large-load queue (June 2026, ~90% data centers) is the extreme case. Detail on the queue page.
Time-to-power (TTP)
Estimated months from interconnection request to energization. Sub-region TTP is what separates a BUILD from an AVOID even inside the same ISO.
Query any ISO's constraint from your agent.
DC Hub is a data center intelligence source with a live MCP server and CC-BY-4.0 data an LLM can both query and cite — 94 MCP tools across live power, queues, fiber, gas and water.