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Repair common Windows errors and clear accumulated junk for a smoother, more stable PC - no reinstall needed.Free scan · no reinstallNeither nuclear power nor natural gas is the universal winner. A 2025 U.S. benchmark estimates a higher levelized cost for new nuclear than for new gas combined-cycle generation, while 2024 data show existing nuclear plants ran more often than either combined-cycle or peaking gas plants. For emissions, gas produces direct carbon dioxide when burned; a full lifecycle comparison requires more than plant-level combustion figures.
At a glance: what the figures compare
The numbers below are not all measures of the same thing. The cost estimates concern new generation; capacity factors describe how much existing utility-scale plants generated relative to their maximum possible output. Neither capacity factor nor levelized cost alone settles which resource is the better choice for a particular grid or project.
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| Measure | Nuclear | Natural gas | What it means |
|---|---|---|---|
| Illustrative new-build cost, 2025 | $200/MWh for U.S. nuclear (Lazard LCOE v18 historical estimate; based on an inflation-adjusted result from an earlier edition) | $78/MWh for U.S. gas combined cycle (Lazard LCOE v18 historical estimate) | Levelized cost estimates for new generation, not the cost of operating an existing plant or a guaranteed project price. |
| Annual utility-scale capacity factor, 2024 | 90.8% (U.S. Energy Information Administration) | 42.6% for combined cycle; 13.9% for gas turbines (U.S. Energy Information Administration) | Observed generation as a share of what the fleet could have produced at continuous full output; utilization is affected by dispatch as well as plant availability. |
| Direct power-plant CO2 | Reactors do not burn carbon fuel to generate electricity. | Combustion releases CO2. | This describes the generation process, not the full lifecycle greenhouse-gas footprint of either technology. |
Which is cheaper: new nuclear or new gas?
In Lazard’s 2025 historical comparison, new U.S. gas combined cycle has the lower illustrative levelized cost: $78/MWh, compared with $200/MWh for nuclear. These are estimates, not quotes for a plant a utility can build today. Lazard’s nuclear figure has an important limitation: because publicly observable new-build nuclear cost data are scarce, it carried forward its v14.0 result with an inflation adjustment, using then-estimated costs for Vogtle as its basis.
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Levelized cost of energy (LCOE) estimates the revenue a generator would need over its cost-recovery period to build and operate. It is useful for comparing modeled projects under stated assumptions, but it does not by itself measure the value a plant provides to the grid or capture every factor that shapes a real investment.
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The U.S. Energy Information Administration’s Annual Energy Outlook 2026 cost paper, released April 8, 2026, evaluates LCOE alongside levelized avoided cost of electricity (LACE) for technologies modeled to enter service in 2031 under its Counterfactual Baseline. It includes weighted and unweighted regional estimates and ranges across 25 U.S. supply regions. LACE estimates revenue available to a generator over its cost-recovery period. EIA cautions that policy, technology and geographic conditions affect actual and modeled build decisions beyond what a single cost measure captures.
New construction is not the same as operating an existing plant
The Lazard figures compare new-build estimates. They should not be treated as the marginal cost of electricity from a plant that has already been built. Existing-plant economics involve operating and maintenance expenses, fuel costs and other plant-specific factors; EIA tracks those separately from new-build projections. Comparing the full cost of a proposed nuclear plant with only the fuel expense of an existing gas plant answers two different questions.
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For a particular project, the result can change with region, financing and cost of capital, construction duration, fuel prices, technology and the year a plant is expected to enter service. Grid value and system needs also matter. The 2025 Lazard figures are therefore a useful benchmark, not a universal verdict on the cost of electricity.
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Which is more reliable?
Nuclear plants had a higher 2024 annual capacity factor than U.S. gas plants in EIA data: 90.8%, versus 42.6% for combined-cycle plants and 13.9% for gas turbines. That shows nuclear generation was used more intensively over the year. It does not, by itself, prove that a nuclear plant is always more reliable or that gas units are less technically dependable.
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Why gas capacity factors differ
Combined-cycle plants and gas turbines serve different roles. Combined-cycle plants use gas to generate electricity through a turbine and then use exhaust heat to produce additional power. Gas turbines may be deployed to meet peak demand and run for fewer hours. Because annual capacity factor reflects dispatch as well as availability, a low fleet figure can result from a plant being called on infrequently rather than from frequent failure.
Capacity factor is not an outage or firm-capacity measure
Capacity factor does not directly report forced-outage rates, the duration of unplanned outages, accredited capacity or performance during extreme weather. Nuclear’s high utilization supports its role as steady bulk generation, but it does not guarantee that every unit will be available at every peak. A strict reliability comparison needs a common dataset and measures suited to the question—such as outage performance and accredited capacity—not capacity factor alone.
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Which is cleaner: nuclear or natural gas?
The answer depends on what “cleaner” means. At the point of generation, burning natural gas releases carbon dioxide; a nuclear reactor does not burn carbon fuel to produce electricity. Those direct-combustion facts do not establish a complete lifecycle greenhouse-gas comparison.
Direct emissions are not lifecycle emissions
EIA’s fuel-emissions factors describe gases released when fuels are burned, and its published greenhouse-gas factors cover energy-related CO2. Those figures do not, by themselves, account for upstream methane leakage from gas production and transport, plant construction, uranium mining and enrichment, fuel processing or waste management. A like-for-like lifecycle comparison needs consistent boundaries across those stages. The figures presented here do not settle that comparison, so they should not be read as lifecycle CO2-equivalent totals.
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- INSTALLS IN CIRCUIT PANEL of most homes with clamp-on sensors. Supports Single phase, Single-split phase, and 2-wire systems. 3-wire systems; 3-phase, 4-wire Wye systems with earthed (TN or TT) neutral (no-Delta) are supported with an additional 200A sensor (sold separately).
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Recent U.S. gas emissions changes are not per-kWh rates
In 2024, U.S. power-sector CO2 emissions were nearly flat overall, while CO2 emissions from natural-gas-fired generation increased 4% (31 million metric tons) and gas generation increased 3% (59 TWh), according to EIA. These are year-over-year changes in aggregate emissions and generation, not emissions-intensity measurements per kilowatt-hour.
How to apply the comparison to a real project
For a utility, policymaker or investor comparing generation options, the relevant question is not just which technology has the lower headline LCOE. Consider what is being built, what it will replace, when it must be available and what the grid needs from it.
- Separate new builds from existing plants. Compare the full costs of proposed projects with the relevant operating costs of existing units, rather than mixing the two.
- Match the measure to the decision. Use LCOE as one estimate of a new generator’s cost and consider LACE and broader system needs when assessing its grid value.
- Distinguish gas technologies and their roles. A combined-cycle plant’s utilization is not interchangeable with that of a peaking gas turbine.
- Define reliability precisely. Decide whether the issue is annual utilization, outage performance, capacity available during peak demand or resilience during extreme conditions.
- Set an emissions boundary. State whether a comparison covers direct plant CO2 or lifecycle greenhouse gases, and use consistent boundaries for both options.
- Test local assumptions. Region, financing, construction timing, fuel prices and policy can materially change project economics.
Gas can provide dispatchable generation, while nuclear can supply high-utilization firm generation without direct combustion CO2 during electricity production. Which option fits better depends on project economics, delivery timing, fuel exposure and the grid’s needs; the headline figures do not decide that question on their own.
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