Site & fuel-source class

Enums for site_class (hydro, gas, wind, solar, behind-meter, orbital, submerged, nuclear SMR, geothermal, battery) and fuel-supply class (associated gas, stranded dry gas, hydro variants, renewables, etc.).

Site class — what kind of facility

The SiteClass enum on ComputeSlot is the physical taxonomy of compute-energy facilities. It drives what permits are required (checkPermitStack), what sensitivities apply (water draw, indigenous consultation), and what analogs are reasonable for underwriting.

Class	Notes
`hydro_run_of_river`	Run-of-river hydro. Minimal regulating storage; output follows river flow. Permit-light, water-rights-sensitive.
`hydro_reservoir`	Reservoir hydro. Substantial regulating storage; dispatchable output. Indigenous consultation almost always required. El Chocón (Embalse Ramos Mexía, ~20 km³ storage on the Limay) fits here.
`gas_associated`	Generation co-located with oil extraction, monetizing otherwise-flared associated gas. Pampa JV Phase 1 (Vaca Muerta oil-window, NGL-rich) fits here; Crusoe playbook.
`gas_stranded_dry`	Dry-gas fields with no pipeline takeaway and no co-located oil production.
`gas_pipeline`	Pipeline-supplied generation. Conventional.
`wind_onshore`	Onshore wind.
`wind_offshore`	Offshore wind.
`solar_pv`	Solar photovoltaic.
`solar_csp`	Concentrated solar with thermal storage. Water-draw heavy.
`curtailed_renewable_hybrid`	Sites built specifically to absorb curtailment from existing renewables.
`behind_meter`	Behind-the-meter colocation; no grid queue.
`orbital`	Space-based compute (Starcloud / Lumen Orbit class). Exploratory.
`submerged`	Subsea data center (Panthalassa-class). Exploratory.
`nuclear_smr`	Small modular reactor.
`nuclear_lwr`	Light-water reactor.
`geothermal`	Geothermal.
`battery_only`	Standalone battery (compute-arbitrage edge case).
`other`	Unenumerated.

Fuel class — what powers the facility

The FuelClass enum on FuelSource and FuelSupplyContract is finer-grained than SiteClass because a single site may have multiple supply contracts (e.g. a gas_associated site with three different well operators on independent contracts).

Class	Carbon class	Notes
`associated_gas`	fossil	Gas produced as a byproduct of oil extraction.
`stranded_dry_gas`	fossil	Dry gas with no economic takeaway.
`pipeline_gas`	fossil	Conventional pipeline gas.
`hydro_run_of_river`	renewable
`hydro_reservoir`	renewable
`hydro_pumped_storage`	renewable
`wind_onshore` / `wind_offshore`	renewable
`solar_pv` / `solar_csp`	renewable
`curtailed_renewable_hybrid`	renewable	Hybrid sites absorbing curtailment.
`behind_meter`	varies	Whatever the host facility burns.
`nuclear_smr` / `nuclear_lwr`	low_carbon
`geothermal`	renewable
`biomass`	varies
`battery_arbitrage`	varies	Arbitrage between cheap/expensive grid hours.
`other`	varies

Carbon class

Tenants increasingly filter on carbon profile. The CarbonClass enum is used by DemandSpec.carbon_class to constrain slot matching:

fossil — gas/oil-derived
low_carbon — nuclear, gas with sequestration, low-emissions-factor grid mix
renewable — hydro, wind, solar, geothermal
additional — projects that demonstrably add new generation (additionality criterion)
removal — projects bundling power with verified carbon removal

ComputeSlot — where these enums attach
DemandSpec — how a tenant filters on them

Site & fuel-source class

Site class — what kind of facility

Fuel class — what powers the facility

Carbon class

Related concepts

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