Full operable fleet, standby reserves, and fuel mix by ISO — the installed-supply side behind every DCPI market score
## Coverage Milestone
DC Hub now tracks the entire US operable generator fleet: **1,374 GW across 27,369 generators**, keyed to **67 balancing authorities**. The dataset includes operating, standby, and returning-to-service capacity by ISO and fuel type — the installed-supply foundation behind every DCPI excess-power score.
## What It Means
Standby reserves are the first signal of grid headroom. A market with 500 MW of gas peakers on standby can absorb a hyperscale lease faster than one where every turbine runs flat-out. ISO-level fuel mix tells you whether that capacity is callable (gas/hydro) or weather-dependent (wind/solar). When ERCOT shows 69.5 excess points and SPP shows 67.2, the generator layer tells you *why*: ERCOT holds 18 GW of standby gas, SPP leans on wind with minimal spinning reserve.
For site selection, this closes the loop. DCPI scores rank markets by net available power; the generator fleet shows you the installed baseline and the fuel that backs it. A market climbing the index with coal retirements and no new peakers is trading one constraint for another.
## Methodology
Generator records are sourced from EIA-860 and EIA-923, cross-referenced with ISO interconnection and retirement filings, updated daily. Each unit is tagged by balancing authority, fuel, nameplate MW, and operational status (operating, standby, retired, planned). The dataset powers the supply-side DCPI calculation and is queryable via the DC Hub MCP API.
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**Source:** DC Hub Data Center Power Index (https://dchub.cloud/dcpi). Updated daily.
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