Nuclear Power for Data Centers: A Practical Feasibility Guide

The nuclear-data center narrative reached peak hype in 2024 with Microsoft's Three Mile Island deal and a wave of hyperscaler announcements. What actually works, what's speculative, and what operators need to understand before pursuing nuclear power—this guide addresses all of it.

The Core Appeal: Why Operators Want Nuclear

Data centers have three power requirements that are difficult to satisfy simultaneously with conventional power:

24/7 carbon-free power: Required by RE100 pledges and Scope 2 emissions commitments
Large block power: 100–500 MW continuous load, not available from variable renewables alone
Long-term price certainty: 10–20 year contracts with fixed or indexed pricing

Nuclear satisfies all three. A 24/7 carbon-free nuclear PPA is structurally superior to a wind/solar + battery package for emissions accounting and operationally simpler for load management.

The problem is access and timeline.

Three Pathways to Nuclear Power

Pathway 1: PPA with an Existing Nuclear Plant

The realistic near-term option.

There are 93 operating commercial nuclear reactors at 55 plants in the US generating approximately 100 GW of capacity. Most are long-running plants with extended operating licenses and relatively low operating costs.

How existing nuclear PPAs work:

Large load customer (data center) contracts for 24/7 delivered energy from a specific plant
Energy is typically "firmed" through the grid rather than physically delivered
Prices range from $55–$90/MWh depending on plant, term, and contract structure
Terms of 10–20 years are standard

Active markets:

PJM (Pennsylvania, New Jersey, Illinois, Ohio): Highest concentration of operable nuclear
MISO (Illinois, Michigan, Minnesota): Exelon/Constellation fleet
ERCOT (Texas): Comanche Peak, South Texas Project

What the Microsoft/Three Mile Island deal shows: Constellation restarted TMI Unit 1 specifically to meet Microsoft's demand. This is exceptional—most nuclear PPAs don't involve plant restarts. But it demonstrates that hyperscale demand is now large enough to influence utility asset decisions.

Limitations:

Geographic arbitrage required: Your data center must be in or near the same ISO as the nuclear plant
Credit requirements: Nuclear counterparties require strong offtaker credit (investment grade or collateral)
Volume constraints: Each plant has limited "uncontracted" capacity available for new offtakers

Pathway 2: Small Modular Reactor (SMR) Co-Location

The aspirational 2030+ option.

SMRs are nuclear reactors with generating capacity under 300 MW, designed for modular factory construction and on-site deployment. The technology is real—NuScale, TerraPower, X-energy, Kairos Power have reactors in various stages of design certification and development.

Timeline reality check:

| Developer | Technology | NRC Status | First Commercial Operation | |-----------|-----------|------------|---------------------------| | NuScale | Light Water SMR | Design certified 2022 | 2030+ (Utah project cancelled 2023) | | TerraPower | Natrium (sodium) | Construction permit filed | 2030 (Wyoming, limited) | | X-energy | Xe-100 (HTGR) | Pre-application | 2030+ | | Kairos Power | KP-FHR | Construction permit 2024 | 2031 (Georgia) | | Oklo | Aurora | License app filed | 2027+ |

The honest assessment: No SMR is commercially operating in the US today. The earliest realistic commercial operation for a data center-adjacent SMR is 2028–2030, and this assumes no regulatory or construction delays—a generous assumption given nuclear's history.

However, the contractual landscape is moving: Google, Amazon, Microsoft, and Oracle have all signed SMR reservation agreements or letters of intent. These create pipeline visibility for developers even if operations remain years away.

For planning purposes: SMRs should be in your 5–10 year portfolio roadmap, not your 2025–2027 project planning.

Pathway 3: On-Site Nuclear (Very Long-Term)

Conceptually interesting, practically distant.

The vision of a data center with an on-site nuclear microreactor (1–50 MW scale) from Oklo, Last Energy, or similar companies exists as a real regulatory and technical pathway. NRC Part 50 and Part 52 licensing, however, takes 5–10 years even for proven designs.

For planning purposes: this is a 2035+ consideration.

Regulatory Requirements: What Operators Actually Need to Know

Even for a straightforward nuclear PPA (not co-location), there are regulatory considerations:

For PPA/Power Purchase:

No NRC involvement: Power purchase agreements don't require nuclear licensing. You're buying electrons from the grid.
FERC jurisdiction: If your PPA involves transmission, FERC regulations apply. Standard for any power contract.
State PUC: Some states require approval for large customer power contracts. Check state-specific requirements.

For Co-Location or On-Site SMR:

NRC licensing: This is the dominant requirement. Construction and Operating Licenses (COL) or Combined License (COLA) processes take 3–7 years.
Environmental review: NEPA review required. Can run 3–5 years.
State and local: Nuclear facilities require state approval and local land use permits.

The regulatory timeline is not negotiable. Any SMR that claims 2026 commercial operation without an NRC license in hand is not being credible.

Pricing Reality: What Does Nuclear Power Actually Cost?

Existing nuclear PPA pricing (2025 market):

Short-term (2–5 year): $65–$85/MWh
Medium-term (5–10 year): $60–$80/MWh
Long-term (10–20 year): $55–$75/MWh

Comparison with alternatives:

Utility bundled rate (coal/gas grid mix): $45–$75/MWh depending on region
Wind PPA (not 24/7): $30–$50/MWh + firming costs of $15–$30/MWh
Solar PPA (not 24/7): $25–$45/MWh + firming costs of $20–$35/MWh
Wind/Solar + long-duration storage (24/7 firmed): $70–$110/MWh

Nuclear's pricing advantage: At $55–$75/MWh for 24/7 carbon-free power, nuclear is competitive with or below a properly firmed renewable portfolio. The advantage widens as data centers grow and the marginal cost of firming variable renewables increases.

The Grid Interconnection Issue Still Applies

Even for data centers pursuing nuclear PPAs, the grid interconnection problem doesn't disappear.

Your data center still needs to physically connect to the grid to receive power—including nuclear power. The nuclear PPA and the data center interconnection are separate processes.

One exception: True on-site co-location where the nuclear facility and data center share a substation and the connection is direct (behind-the-meter). This is the future state for SMR co-location. It doesn't apply to existing plant PPAs.

Practical implication: Nuclear power procurement strategy must be coordinated with, not substituted for, grid interconnection strategy.

What Operators Should Actually Do Now

Step 1: Audit your existing power contracts and grid positions Do you have long-term fixed-price power contracts? Where are you exposed to market pricing? Nuclear becomes more compelling as market power prices increase.

Step 2: Screen for existing nuclear PPA availability in your target markets Constellation, Exelon, NextEra, and Duke all have nuclear capacity. Request RFPs for 24/7 nuclear delivery in markets where you have or plan data center presence.

Step 3: Engage with SMR developers Even if commercial operation is 5+ years away, reservation agreements and letters of intent position you in the development pipeline. The operators with reservations will have first access to commercial capacity.

Step 4: Model the 24/7 carbon accounting Many large operators have RE100 or Scope 2 commitments that require 24/7 carbon matching, not annual average matching. Nuclear is one of the few realistic solutions at scale. Quantify the premium you'd pay for genuine 24/7 carbon-free power.

Step 5: Don't wait on SMRs for your 2025–2027 capacity needs Build your near-term pipeline with existing utility power and/or existing nuclear PPAs where available. SMRs are a portfolio hedge, not a current solution.

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