Steel, concrete, construction sites, components, and fuel generate emissions before commissioning. However, a nuclear power plant produces large quantities of electricity for decades at a high capacity factor; this is why lifecycle emissions per kWh are low. Construction contributes, but not enough to make nuclear comparable to gas or coal in IPCC/UNECE assessments.
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38.
Does building a nuclear power plant produce enormous emissions?
It generates emissions, but spread over a large amount of electricity produced.
