Resolved: New nuclear power plants should be a substantial part of new electricity generation capacity built for decarbonization through 2050. (demo debate, citations are illustrative)

The IPCC AR5 harmonized lifecycle assessment reports a median of 12 gCO2-equivalent per kWh for nuclear against 11 to 12 for wind, and the UNECE 2021 lifecycle assessment reports 5.1 to 6.4 gCO2e per kWh for nuclear, the lowest of the technologies assessed.

If nuclear lifecycle emissions are at or below the level of the lowest-emission renewables, nuclear generation can substitute for fossil generation without a material emissions penalty.

• T1IPCC AR5 WGIII Annex III, harmonized lifecycle estimates (2014)
• T2UNECE, Life Cycle Assessment of Electricity Generation Options (2021)

Candidate raises the evidence base from a single T3 study to a T1 meta-assessment plus a T2 official assessment; assertion tightened accordingly.

1. v2Standing · m.chen
2. v1Superseded by v2 · j.okafor

The US Energy Information Administration publishes annual capacity factors by source; nuclear leads all generation sources and has remained above 92 percent throughout the cited period.

A source with the highest sustained capacity factor supplies firm output, which complements variable renewables in a decarbonized grid.

• T2US EIA, Electric Power Monthly, Table 6.07.B (capacity factors)

Official statistics (T2); assertion scoped to the measured jurisdiction and period.

A peer-reviewed analysis of land-use intensity of electricity, including fuel-cycle land, reports nuclear near 0.3 square meters per MWh, roughly an order of magnitude below utility-scale solar and wind footprints.

Lower land intensity per unit of low-carbon energy reduces siting conflict and ecosystem disturbance, which bears on how much low-carbon capacity can feasibly be built.

• T3Lovering et al. (2022), Land-use intensity of electricity production, PLOS ONE

Peer-reviewed T3 with fuel-cycle boundary stated in grounds.

Lazard reports unsubsidized nuclear LCOE of 141 to 220 dollars per MWh against 29 to 92 for utility solar and 27 to 73 for onshore wind; the IEA and NEA joint report shows the same ordering; a 2026 peer-reviewed cross-country analysis reports the gap widening through 2025.

If each unit of capital buys more low-carbon energy elsewhere and the gap is widening, directing marginal decarbonization capital to nuclear yields less total abatement over the planning horizon.

• T2Peer-reviewed cross-country LCOE analysis (2026), Nature Energy (illustrative)
• T4Lazard, LCOE+ analysis (2024)
• T3IEA/NEA, Projected Costs of Generating Electricity (2020)

Appeal-cycle version adds the admitted T2 source to the existing citations; the evidence base rises from 3.5 to 5.0.

1. v2Standing · n.rivera
2. v1Superseded by v2 · n.rivera

A peer-reviewed dataset of 401 electricity infrastructure projects found nuclear reactors had the highest frequency and magnitude of cost overruns, averaging above 100 percent; Flamanville 3, Vogtle 3 and 4, and Olkiluoto 3 each exceeded initial budgets by more than a factor of two and initial schedules by close to a decade.

A generation option with a documented record of large delivery overruns carries planning risk that discounts its nominal cost and schedule projections.

• T3Sovacool, Gilbert & Nugent (2014), Energy Research & Social Science

Repair version replaces the failed T5 source with the peer-reviewed dataset named in the upheld challenge; assertion rescoped to what that dataset supports.

1. v2Standing · s.patel
2. v1Knocked down · s.patel

The Onkalo repository in Finland, the most advanced project, entered trial operation only in 2025; other national programs remain in siting or licensing stages according to the IAEA status reporting.

A strategy that depends on expanding a technology whose waste pathway is not yet operating at scale carries an unpriced long-term liability.

• T3IAEA, Status and Trends in Spent Fuel and Radioactive Waste Management (2022)

Institutional T3 source; assertion scoped with "at full scale".