Orbital Data Centers

Orbital Data Center Economics

Launch Cost Trajectory

Historical and projected $/kg to LEO: from Space Shuttle ($54,500/kg) through Falcon 9 ($2,600/kg) to Starship targets ($100-200/kg). Google's $200/kg parity threshold marked.
Active/OperationalProjected/TestingIn DevelopmentRetired

Space vs Terrestrial Cost Comparison

1 GW orbital DC costs ~$42.4B vs $14.8B terrestrial (McCalip analysis). Space wins on energy, cooling, water; loses on launch cost, maintenance, and insurance.

Orbital (Space)

  • Total Cost (1 GW)
    $42.4B

    McCalip Calculator, TechCrunch

  • LCOE (Levelized Cost of Energy)
    $891/MWh

    McCalip Model

  • PUE (Power Usage Effectiveness)
    1.0 (theoretical ideal)Advantage

    TechTarget, AirSys

  • Cooling Cost (% of OpEx)
    0% (radiative cooling to space)Advantage

    DataSpan, Thunder Said Energy

  • Water Consumption
    ZeroAdvantage

    Lawrence Berkeley Lab

  • Solar Irradiance
    1,361 W/m²Advantage

    NASA GSFC, Wikipedia

  • Solar Capacity Factor
    ~95% (LEO sun-sync)Advantage

    McCalip, SatNews

  • Google Solar Advantage
    8x annual energy productionAdvantage

    Google Research Blog

  • Land Use
    Zero land footprintAdvantage

    Industry consensus

  • Grid Connection
    Not needed (self-powered)Advantage

    Industry analysis

  • Maintenance Access
    Zero (no servicing capability)

    Gartner, IEEE Spectrum

  • Hardware Replacement
    Impossible (deorbit and replace)

    Gartner

  • Latency to End Users
    20-40 ms (LEO round-trip)

    Industry standard

  • Scalability
    Limited by launch cadence

    Deutsche Bank

  • Insurance/Risk
    No mature space DC insurance market

    DCD

  • Environmental Impact
    Zero emissions (solar), debris riskAdvantage

    ESA, IEA

Terrestrial (Ground)

  • Total Cost (1 GW)
    $14.8BAdvantage

    McCalip Calculator, TechCrunch

  • LCOE (Levelized Cost of Energy)
    $398/MWhAdvantage

    McCalip Model

  • PUE (Power Usage Effectiveness)
    1.54 (US average)

    TechTarget, AirSys

  • Cooling Cost (% of OpEx)
    30-40% of energy consumption

    DataSpan, Thunder Said Energy

  • Water Consumption
    17B gallons/year (US DCs, 2023)

    Lawrence Berkeley Lab

  • Solar Irradiance
    ~200-300 W/m² effective

    NASA GSFC, Wikipedia

  • Solar Capacity Factor
    23.5% (US average)

    McCalip, SatNews

  • Google Solar Advantage
    Baseline

    Google Research Blog

  • Land Use
    Hundreds of acres per GW-scale DC

    Industry consensus

  • Grid Connection
    Major bottleneck (years to connect)

    Industry analysis

  • Maintenance Access
    Full 24/7 accessAdvantage

    Gartner, IEEE Spectrum

  • Hardware Replacement
    Standard IT refresh cyclesAdvantage

    Gartner

  • Latency to End Users
    <1 ms (on-premises fiber)Advantage

    Industry standard

  • Scalability
    Limited by power/land/permits

    Deutsche Bank

  • Insurance/Risk
    Standard commercial insuranceAdvantage

    DCD

  • Environmental Impact
    CO2 emissions, water use, land use

    ESA, IEA

Terrestrial Data Center Market Context

$61B invested in DC construction (2025), 1,189 hyperscale DCs globally, 415 TWh energy consumption (2024), ~$443B hyperscaler capex (2025).
MetricValueYearTrend / ContextSource
Global DC Construction Investment$61B2025Record year; doubling from $30B in 2023CNBC, S&P Global
DC Construction Market Size$241B2024Growing at 11.8% CAGR to $457B by 2030Grand View Research
DC CapEx Pipeline (projected doubling)$1.1 trillionBy 2029Doubling from ~$430B in 2024 baseeWeek
Hyperscale DCs Worldwide1,189Q1 2025Growing steadily; US accounts for 54% of capacitySynergy Research
Global DC Energy Consumption415 TWh20241.5% of global electricity; 15% annual growthIEA
Projected DC Energy Consumption945 TWh2030Doubling in 6 years driven by AIIEA
US DC Power Demand Growth+22% in 20252025Tripling to ~150 GW by 2028-2030S&P Global
US DC Share of Electricity4.4% today → 12% by 20302025-2030From ~38 GW to 134 GWWorld Resources Institute
Grid Connection Queue10,300 projects / 1,400 GW capacityEnd 2024Avg 3-7 year wait; $10-50M+ substation upgradesEngineering News-Record, LandGate
Delayed DC Projects36 projects / $162B investment blocked/delayedMid-2025Grid bottleneck is primary constraintData Center Frontier
Top 5 Hyperscaler CapEx~$443B (Amazon $125B, Microsoft $118B, Google $93B, Meta $72B)2025Projected to grow to ~$602B in 2026MUFG, Bloomberg, Axios
US DC Water Consumption17B gallons/year (449M gal/day)2023Single 5M gal/day facility = 10% of county water supplyLawrence Berkeley Lab, EESI
Average PUE (industry)1.562024Down from 2.5+ in 2007; plateauing; Google at 1.09Statista, Google
Land ConstraintsSilicon Valley near $100/sq ft2025⅔ of new capacity moving outside NoVA and SVJLL

Power Advantage: Space Solar

Space solar: 1,361 W/m², 95%+ capacity factor, 8x more productive than Earth. Solar array specific power evolution from ISS (27 W/kg) to advanced thin-film (>200 W/kg).

Space (Orbit)

  • Solar Irradiance (constant)1,361 W/m² (solar constant)

    Wikipedia, PVEducation

  • Atmospheric Absorption Loss0% (no atmosphere)

    Wikipedia Solar Irradiance

  • Effective Average Irradiance1,293-1,361 W/m² (LEO sun-sync)

    NASA GSFC, S&P Global

  • Capacity Factor~95%+ (sun-synchronous orbit)

    McCalip Analysis, SatNews

  • Night/Weather Downtime0-5% eclipse (orbit-dependent)

    Orbital mechanics

  • Annual Energy Output (per m²)~11,200 kWh/m²/year

    Calculated from irradiance × capacity factor

  • Google's 8x Productivity Claim8x more power per panel per year vs Earth

    Google Research Blog

  • ISS Original Solar Arrays27 W/kg specific power

    NASA Solar Power Technologies

  • ISS iROSA Arrays (Redwire)75.3 W/kg specific power

    Wikipedia ROSA, Redwire

  • Advanced Thin-Film (target)150-250 W/kg specific power

    ScienceDirect

  • ISS Total Solar Power~120 kW (end-of-life with iROSA)

    NASA ISS Facts

  • Starcloud Solar PowerNot publicly disclosed

    Starcloud

  • Cost of Space Solar Panels~$500-1,000/W (current)

    IEEE Spectrum, industry estimates

  • Degradation Rate~1-2% per year (radiation)

    Industry standard

Earth (Surface)

  • Solar Irradiance (constant)~1,000 W/m² peak (sea level, clear day)

    Wikipedia, PVEducation

  • Atmospheric Absorption Loss~25% absorbed/scattered

    Wikipedia Solar Irradiance

  • Effective Average Irradiance~200-300 W/m² (location-dependent average)

    NASA GSFC, S&P Global

  • Capacity Factor23.5% (US national average)

    McCalip Analysis, SatNews

  • Night/Weather Downtime50-75% (night + weather + seasons)

    Orbital mechanics

  • Annual Energy Output (per m²)~1,400 kWh/m²/year (good locations)

    Calculated from irradiance × capacity factor

  • Google's 8x Productivity ClaimBaseline 1x

    Google Research Blog

  • ISS Original Solar Arrays-

    NASA Solar Power Technologies

  • ISS iROSA Arrays (Redwire)-

    Wikipedia ROSA, Redwire

  • Advanced Thin-Film (target)-

    ScienceDirect

  • ISS Total Solar Power-

    NASA ISS Facts

  • Starcloud Solar Power-

    Starcloud

  • Cost of Space Solar Panels~$0.20-0.50/W (terrestrial)

    IEEE Spectrum, industry estimates

  • Degradation Rate~0.5% per year (weather/UV)

    Industry standard

The Cooling Challenge

ISS rejects 70 kW via 422 m² radiators. A 1 GW orbital DC at 40% efficiency would need ~834,000 m² of radiator area. Liquid droplet radiators offer 7x improvement.

ISS Active Thermal Control (EATCS)

70 kW heat rejection

External Active Thermal Control System using ammonia loops + radiators

Wikipedia EATCS, NASA

ISS Total Radiator Area

422 m²

14 radiator panels on station truss

Wikipedia EATCS

ISS Radiator Power Density

~166 W/m²

70 kW / 422 m² = 166 W/m²

Calculated

Space Ambient Temperature

~2.7 K (-270.5°C)

Cosmic microwave background; near absolute zero

Physics standard

Heat Rejection Method in Space

Radiation only (Stefan-Boltzmann law)

No convection or conduction possible in vacuum

Thermodynamics

1 MW GPU Cluster Waste Heat

~600-700 kW (at 60-70% efficiency)

Must be radiated; cannot use air or liquid to outside

Industry estimate

Radiator Area for 1 MW

~2,500 m²

At ~400 W/m² (optimistic advanced radiators)

Space Computer Blog

1 GW DC Waste Heat (40% efficiency)

600 MW

60% of total power becomes waste heat

Medium Analysis

Radiator Area for 1 GW (600 MW)

~834,000 m²

At ~166 W/m² ISS-class radiators (834,000 m² ≈ 83 hectares)

Medium Analysis

Radiator Mass for 1 GW

~2,250 tonnes

At typical ~2.7 kg/m² radiator mass

Medium Analysis

Launch Cost for 1 GW Radiators

~$450M (at $200/kg)

Just for radiator mass to orbit

Calculated

Advanced Liquid Droplet Radiators

10x lighter than solid radiators

Research-stage technology; sprays droplets to radiate heat

Wikipedia LDR, ScienceDirect

Starcloud Approach

Distributed micro-satellites

Each small satellite has modest thermal load; avoids mega-radiator problem

Starcloud strategy

Google Suncatcher Approach

81-satellite cluster

Distributes computing and thermal load across many small spacecraft

Google Research

Launch Provider Comparison

10 vehicles compared: Falcon 9, Falcon Heavy, Starship, Electron, Neutron, New Glenn, Vulcan, Ariane 6, Long March 5, and Long March 9.
VehicleOperatorPayload to LEO (kg)Total CostCost per kgReusabilityStatus
Starship (50-70 flights)SpaceX150,000~$2-3M$13-20Full reuse targetProjected (2030s)
Starship (20 flights)SpaceX150,000~$5M$32.50High reuseProjected
Starship (6 flights)SpaceX150,000~$12-14M$78-94Partial reuseProjected
Starship (single-use)SpaceX150,000-200,000~$90M (est.)$250-600Expendable configTesting; V3/Block 3 debut May 2026 (payload deployed, booster lost)
Falcon 9 (internal/marginal)SpaceX22,800~$14.3M (internal)$629Booster reuse (high-flight)Active (Starlink deploys)
Falcon HeavySpaceX63,800~$97M$1,400Side booster reuseActive
Long March 9 (projected)CASC (China)150,000~$225M (est.)~$1,500Partially reusable (planned)First flight 2033
New GlennBlue Origin45,000~$68M$1,511Reusable first stageFirst launch Jan 2025
Falcon 9 (customer)SpaceX22,800~$67M (list price)$2,600Booster reuse (20+ flights)Active (workhorse)
Long March 5CASC (China)25,000~$75M~$3,000ExpendableActive
Neutron (projected)Rocket Lab13,000$50-55M~$4,000Reusable first stageIn development (2026)
Ariane 6 (A64)ArianeGroup21,600~$115M (target)~$5,324ExpendableActive
Ariane 6 (A62)ArianeGroup10,350~$80M (target)~$7,729ExpendableActive (first launch Jul 2024)
Ariane 5ArianeGroup21,000~$178M$8,476ExpendableRetired 2023
Vulcan CentaurULA10,800$110M$10,185Expendable (SMART reuse planned)Active (first launch Jan 2024)
Atlas V (401)ULA10,986~$130M$11,837ExpendableActive (retiring)
Delta IV HeavyULA28,790~$350M$12,157ExpendableRetired 2024
ElectronRocket Lab200-300$7.5M$25,000Expendable (Neutron: reusable)Active
Space ShuttleNASA27,500~$1.5B per mission$54,500Partial (orbiter + SRBs)Retired 2011

Orbital DC Viability Threshold: $200/kg

Target for orbital DC viability. Vehicles below this cost enable economically viable space data centers.

US Data Center Electricity Use (Terrestrial Analog)

LBNL historical estimates: 58 TWh (2014) to 176 TWh (2023). 2028 bars are LBNL scenarios (325 to 580 TWh), not a single-point forecast. Measured analog for the grid constraint orbital proposals cite. Not an orbital TAM.

Big-Four Hyperscaler Capex (Measured)

Cash capex from SEC filings, 2019 to 2025. Combined 2025 cash capex exceeded $370B. Finance leases are excluded, so totals run below company guidance. Ground-side spending analog, not orbital revenue.

PUE Analog: Survey vs Hyperscale vs Theoretical Orbit

Uptime Institute 2024 survey average PUE 1.56 and Google 2023 fleet PUE 1.10 are measured. The 1.0 orbital bar is a theoretical floor (no convective HVAC). No commercial orbital DC has published a PUE.
MeasuredTheoretical

Datacenter GPU Thermal Design Power

NVIDIA datasheet TDP: A100 SXM 400 W, H100/H200 SXM 700 W, B200 SXM 1,000 W. Specified heat, not in-orbit draw. Every watt in vacuum must be radiated. Starcloud-1 flew an H100-class GPU.

US Industrial Electricity Price (EIA, Measured)

Average industrial retail tariff, 2014 to 2025. Rose from 6.67 cents/kWh in 2020 to 8.62 cents in 2025. Ground-side energy-cost analog. Orbital sites would not pay this tariff.

PJM Capacity Prices (Power Scarcity Analog)

PJM base residual auction RTO clearing prices. 2025/26 and 2026/27 cleared near the cap after a decade of low prices. Measured signal of data center load outrunning Northern Virginia supply. Not an orbital price.

US Interconnection Queues (Siting Delay Analog)

Berkeley Lab Queued Up: about 2,600 GW waiting at end-2023, more than double the installed US fleet. Typical waits are years. Most queued megawatts never get built. Terrestrial siting analog.

Terrestrial DC Equipment Lead Times

DOE and industry quoted ranges as of 2025: large transformers 24 to 48 months, heavy-duty turbines 36 to 60 months. Shape of the ground-side delay, not a forecast of orbital hardware lead times.

ISS Solar Power (Only MW-Class Orbital Analog)

NASA STMD: six iROSA wings raised combined ISS generation to more than 250 kW. Each wing is more than 28 kW at beginning of life (Redwire/NASA) or more than 20 kW in NASA's 2023 blog. Measured flight analog, not an orbital DC nameplate.
ItemValueKind
Unshaded remainder of original ISS arraysAbout 95 kW combinedmeasured
Each iROSA wing (NASA 2023 blog)>20 kWmeasured
Each iROSA wing (BOL)>28 kW BOLmeasured
Six iROSA wings (Redwire)>120 kW combined BOLmeasured
ISS combined generation with six iROSA>250 kWmeasured
Two additional iROSA (requested)About 15 kW more once installedplanned
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Orbital Data Center Economics: Market Data | Sterling