Nuclear power is included in carbon-free energy but it obviously has severe disadvantages when compared to renewable sources.

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Carbon-free energy is defined as "energy generation that produces no direct carbon dioxide emissions during operation",
However, compared with renewable energy, nuclear power has severe differences in scope 2 and 3 emissions.

- For nuclear power, fuel rods are necessary for operation which are produced with high energy input. These fuel rods are "consumed" during operation.
- In contrast to green energy, nuclear power also requires water to cool down the fuel rods during operation. Since water consumption is also considered for data centers, it should be also for energy sources.
- Nuclear power has a long term impact on the environment due to nuclear waste and radiation which also causes carbon emissions for transport and storage. Other impacts include human health and the risk of nuclear accidents resulting in long-term contamination and waste of/useless land.
- Finally, nuclear power plants have very long lead times which also result in high emissions before the plant operates.

There may be additional substantial differences.

All in all, nuclear power may be a green energy in operation at first sight but its specific characteristics should be considered and it shouldn't be in the same category as renewable energy. There should be at least a distinction between these energy sources for more elaborated considerations.