Nuclear power plants use the nuclear fission reaction to produce electricity. What is the advantage of producing electricity by fusion reaction ?

Explanation

**Step-by-Step Solution:**

1. **Understanding Nuclear Fusion**: Nuclear fusion is the process where two light atomic nuclei combine to form a heavier nucleus, releasing a significant amount of energy in the process. This is the same reaction that powers the sun.

2. **Energy Output**: One of the main advantages of nuclear fusion over nuclear fission is that it produces a much larger amount of energy per unit mass of fuel. For example, fusion reactions can release millions of times more energy than chemical reactions and significantly more than fission reactions.

3. **Fuel Availability**: The fuels used in fusion reactions, such as isotopes of hydrogen (deuterium and tritium), are abundant and can be sourced from water and lithium. This makes fusion a more sustainable energy source compared to the limited supply of uranium and plutonium used in fission.

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