Small Modular Reactors (SMRs) and the Future of 24/7 Carbon-Free Commercial Power

In November 2023, Google announced Power Purchase Agreements with Kairos Power for 500 MW of nuclear electricity from small modular reactors — with deliveries expected between 2030 and 2035. In September 2023, Microsoft entered a 20-year SMR agreement with Constellation Energy for power from the Three Mile Island nuclear plant restart. Amazon has structured SMR agreements across multiple vendors.

These aren't marginal deals by companies hedging their bets. They represent a fundamental conviction, emerging from the world's most sophisticated energy procurement teams, that Small Modular Reactors represent the most credible path to genuinely 24/7 carbon-free electricity at commercial scale.

For most commercial businesses — even large ones — the practical relevance of SMR technology is currently indirect. No SMR is producing commercial power in the United States today, and most projects won't deliver electricity until 2029-2035. But the strategic questions SMR development raises are immediately relevant: what does 24/7 carbon-free electricity mean for your sustainability commitments? How does SMR-backed power compare to the renewable energy instruments you can buy today? And if the world's largest electricity consumers are structuring their 2030+ energy strategy around nuclear, what should your business be doing now?

This guide answers those questions with the rigor the topic deserves — neither dismissing SMRs as science fiction nor overstating their near-term commercial availability. The goal is to help business energy buyers make informed decisions about current procurement and future strategy in the context of a genuinely transforming power supply landscape.

What an SMR Is and Why Hyperscalers and C&I Buyers Are Signing PPAs

Defining Small Modular Reactors

A Small Modular Reactor is a nuclear fission power plant with electrical output capacity below approximately 300 MW (versus 1,000-1,600 MW for conventional large-scale nuclear). The "modular" aspect refers to factory manufacturing of the reactor components, enabling standardized production and on-site assembly rather than bespoke construction of each plant.

Key SMR advantages over conventional nuclear:

Lower capital per project: While cost per kW may be higher, the smaller absolute investment reduces financial risk per project
Factory manufacturing: Standardized production should improve quality control and reduce construction cost over time
Flexible siting: Smaller footprint enables placement closer to load centers
Passive safety systems: Most SMR designs incorporate passive safety features that don't require operator action or external power to maintain safe shutdown

Key SMR vendors in active US development (2026):

Kairos Power (KP-FHR): Fluoride salt-cooled high-temperature reactor; 140 MW; DOE-backed; Google PPA in place; Hermes demonstration plant in Tennessee targeting 2028
TerraPower (Natrium): Sodium-cooled fast reactor with molten salt energy storage; 345 MW with 500 MW peak burst capacity; Wyoming project with DOE co-funding; targeting late 2020s
X-energy (Xe-100): High-temperature gas-cooled pebble bed reactor; 80 MW modules deployed in 4-unit clusters (320 MW); Amazon has major investment; DOE funded
Last Energy (PWR-20): 20 MW pressurized water microreactor; focused on factory manufacturing and rapid deployment; early-stage industrial customer agreements
NuScale Power (VOYGR): Pressurized water SMR; cancelled the Utah AMPA project in 2023 (cost overruns) but continuing development; setback demonstrates real cost risks

Why Hyperscalers Are the Vanguard

The hyperscale cloud and AI companies (Google, Microsoft, Amazon, Meta) have become the most financially sophisticated commercial energy buyers in history. Their procurement decisions reflect three factors that distinguish their position from typical commercial businesses:

Scale of demand: Each major hyperscaler requires gigawatts of new power supply; SMR PPAs in the hundreds of MW are a natural portfolio item
24/7 CFE commitment: All four major hyperscalers have committed to 24/7 carbon-free energy — matching their electricity consumption to clean generation on an hourly basis. Wind and solar, which are intermittent, cannot satisfy this requirement without massive storage. SMRs, with 90%+ capacity factors, provide what wind and solar cannot.
Long time horizons: These companies plan infrastructure 10-20 years forward; SMR contracts for 2030 delivery align naturally with their investment horizons

2026-2030 SMR Project Pipeline and Earliest Commercial PPA Dates

The honest assessment of the SMR commercial pipeline is: significant progress, but real delays remain likely. Anyone telling you SMR power is certain to be commercially available by 2028 is being optimistic. Anyone telling you it's a dead end is ignoring concrete project milestones.

Active US SMR Projects and Timelines

Kairos Power — Tennessee Demo (Hermes I & II)

Status: Nuclear Regulatory Commission (NRC) construction permit issued 2023 — a historic first for an SMR design
Hermes I: 35 MWt demonstration unit; construction underway; expected operation 2028
Hermes II: Commercial scale plant following; 2030 target
Google PPA: 500 MW from follow-on commercial fleet; 2030-2035 delivery

TerraPower — Wyoming (Natrium)

Status: Site preparation and early construction underway; NRC construction permit application in process
Expected commercial operation: 2030-2031
Partner: PacifiCorp utility; Wyoming state support; DOE $2.3B commitment

X-energy — Dow Chemical partnership

Status: DOE ARDP (Advanced Reactor Demonstration Program) award; site in Texas
Dow will be anchor industrial customer using SMR for process heat and electricity
Expected commercial operation: Late 2020s (2028-2030)

NRC Licensing Progress The NRC has issued its first SMR construction permit (Kairos) and is actively reviewing several additional design certifications. Licensing timelines remain the largest variable in deployment schedules.

Realistic PPA Availability for Non-Hyperscale Businesses

For a mid-market commercial business looking to procure SMR-backed electricity:

Before 2030: Not realistic. No commercial SMR plants operating in the US.
2030-2033: Limited availability through green tariff programs from utilities that have SMR off-take agreements; direct commercial PPAs primarily available to large load customers
2033-2035+: Broader commercial PPA market likely to develop as multiple plants come online and the off-take market matures

SMR-Backed Clean Energy PPAs vs Traditional VPPAs and RECs

Understanding where SMR-backed power fits in the spectrum of renewable energy procurement instruments helps frame the strategic decision for commercial buyers.

The Quality Spectrum of Clean Energy Claims

Instrument	Hourly Matching	Technology	Carbon Claim Quality	Availability
Bundled RECs	No	Variable RE	Low (annual)	Immediate
VPPA	No	Variable RE	Medium (annual)	Immediate
Green Tariff	Depends	Mixed	Medium	Immediate
Dedicated solar/wind PPA	No	Variable RE	Medium (annual)	Immediate
24/7 CFE matching (storage-backed)	Yes	Variable + storage	High	Emerging
SMR-backed PPA	Yes	Firm nuclear	Very high	2030+

The core limitation of all wind and solar instruments (RECs, VPPAs, PPAs) is their temporal mismatch: the renewable generation happens when the wind blows and sun shines, not necessarily when your facility consumes electricity. Purchasing a REC produced at midnight doesn't clean up your electricity consumption at 3 PM — but that's how market-based accounting has historically allowed it to be counted.

Google's 24/7 Carbon-Free Energy initiative, the Energy Tag (ETG) standard, and emerging SBTi guidance are all pushing toward hourly matching — verifying that clean generation occurs in the same hour as consumption. Wind and solar alone can't provide this; storage-backed renewables can provide it partially; nuclear provides it completely, 90%+ of hours.

VPPAs vs SMR PPAs: The Right Tool for the Right Timeline

Virtual power purchase agreements (VPPAs) are the right instrument for most commercial businesses seeking to reduce Scope 2 emissions today:

Available immediately
Lower cost premium than storage-backed CFE
Provide renewable attribute certificates that satisfy most current reporting frameworks
Financially liquid (can sell surplus RECs if generation exceeds need)

SMR PPAs are the right instrument for businesses that:

Need to make 2030+ energy commitments with confidence
Are committing to 24/7 CFE at the highest quality standard
Have the scale and sophistication to structure long-term fixed-price agreements
Can absorb the counterparty risk of developers still in pre-commercial stages

For Scope 2 emissions reporting purposes, VPPAs with high-quality attribute certificates satisfy current requirements. SMR-backed power would provide genuinely superior hourly attributes when available.

Should Your Business Wait for SMRs or Procure Renewables Now?

This is the most practically important question for commercial energy buyers, and the answer is clear: do not wait.

The Cost of Waiting

Corporate sustainability targets — SBTi, RE100, net-zero commitments — operate on timelines that don't accommodate a 5-7 year wait for SMR availability. A company committed to 100% renewable electricity by 2030 cannot structure a credible path that begins with "wait for SMRs."

Beyond sustainability timelines, the financial case for renewable energy procurement now is strong. Current VPPA pricing in PJM and MISO markets often delivers electricity economics at or below utility reference rates. Waiting for SMR availability means 5-7 years of foregone savings.

The Right Two-Stage Strategy

Stage 1 (Now - 2029): Procure renewable energy using available instruments — VPPAs, green tariffs, direct solar PPAs — to maximize immediate Scope 2 reductions and potentially generate economic savings. Structure contracts for 5-7 year terms that expire around the time SMR commercial availability begins.

Stage 2 (2029-2035+): As SMR-backed utility green tariff products and eventually direct commercial PPAs become available, evaluate replacing or supplementing Stage 1 instruments with SMR-backed power to achieve 24/7 hourly matching and the highest-quality clean energy claim.

Exploring renewable electricity options for businesses available today — bundled RECs, VPPAs, green tariffs, on-site solar — gives commercial buyers the full menu of what's achievable before SMR availability.

Conclusion

Small Modular Reactors represent a genuine and potentially transformative addition to the clean energy toolkit for commercial buyers — but on a timeline measured in years, not months. The first commercial US SMR plants are likely to deliver power in 2030-2033, with a broader commercial PPA market developing afterward.

For commercial businesses today, the strategic imperative is to act now on available renewable energy instruments — VPPAs, green tariffs, on-site solar — to meet current sustainability commitments and capture available economics, while structuring contracts with expirations that allow for transition to SMR-backed products as they become commercially available.

The businesses that win on clean energy economics will be those that procure intelligently today AND position themselves to access next-generation technologies as they mature. Commercial Energy Advisors can help your business navigate both the immediate procurement landscape and the strategic framework for the decade ahead.

Call 833-264-7776 or contact us today for a comprehensive clean energy procurement strategy review.

Frequently Asked Questions

What is a Small Modular Reactor (SMR)?

An SMR is a nuclear fission power plant generating less than approximately 300 MW — significantly smaller than conventional 1,000-1,600 MW nuclear plants — with components that are factory-manufactured for modular on-site assembly. Key advantages include lower per-project capital cost, standardized construction, and passive safety features.

When will commercial SMR power be available in the United States?

The most advanced US SMR projects (Kairos Power, TerraPower) are targeting commercial operation in 2030-2032. A broader commercial PPA market for non-hyperscale businesses is unlikely before 2033-2035.

Why can't solar and wind alone provide 24/7 carbon-free electricity?

Wind and solar are intermittent — they generate electricity when weather conditions allow, not necessarily when customers consume electricity. Without paired storage (which adds significant cost), there will always be hours when renewable generation is unavailable. SMRs, with 90%+ capacity factors, generate electricity continuously regardless of weather.

Can my business sign an SMR PPA today?

Direct SMR PPAs are currently available only to major hyperscale cloud/AI companies with gigawatt-scale demand and sophisticated procurement teams. For most commercial businesses, SMR-backed electricity will become accessible through utility green tariff programs after the first commercial plants begin operating — likely 2030-2033.

Are VPPAs or RECs good enough for Scope 2 reporting while SMRs mature?

Yes. VPPAs and bundled RECs satisfy GHG Protocol market-based accounting requirements and current CDP, SBTi, and SEC disclosure standards for Scope 2 emissions. As 24/7 CFE matching requirements mature (post-2025 SBTi guidance), higher-quality instruments will become necessary — SMRs will eventually provide a superior answer.

What are the risks of the SMR development pipeline?

The NuScale cancellation in 2023 demonstrated real cost risks: the Utah AMPA project was cancelled when projected costs exceeded $9,400/kW. Other risks include licensing delays, construction delays for first-of-a-kind technology, supply chain constraints for specialized nuclear components, and utility regulatory approval requirements.

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