You're asking a bit of a tricky question! Nuclear fusion *is* possible, and we've even managed to achieve it in controlled environments (though it's still a big challenge).

However, the amount of kWh (kilowatt-hours) produced by fusion depends heavily on various factors, like:

* The specific fusion reaction: Different fusion reactions release varying amounts of energy. For example, the most common reaction studied is deuterium-tritium fusion, which releases a huge amount of energy.

* The scale of the fusion reactor: A small-scale experiment will produce far less energy than a full-scale fusion power plant.

* Efficiency of the reactor: How much of the energy released by the fusion reaction is actually converted into usable electricity? This efficiency varies significantly.

Here's why it's hard to give a specific number:

* We don't have a commercial-scale fusion power plant yet: The current research is focused on demonstrating the feasibility of sustained fusion and achieving net energy gain (producing more energy than it takes to start the reaction).

* Theoretical estimates vary: While we can calculate the energy released from a specific fusion reaction, the actual output of a power plant would depend on many complex factors.

Instead of a specific number, let's consider what we know about fusion energy:

* Potential for massive energy production: Fusion reactions release immense amounts of energy, far more than traditional nuclear fission.

* Clean and abundant fuel: The fuel for fusion (deuterium and tritium) is abundant in seawater, making it a potentially inexhaustible energy source.

* No greenhouse gas emissions: Fusion doesn't produce greenhouse gases, making it a very clean energy option.

In short, while we don't have a precise figure for kWh produced by fusion, it holds immense potential for a clean and abundant energy future.