Nuclear power is a way of making electricity by using energy that comes from tiny things called atoms. Some people think that nuclear power is a good thing because it can make electricity without causing pollution like burning things like coal and oil does. But other people think that nuclear power is a bad thing because if something goes wrong, it can cause very big problems, like what happened in a place called Chernobyl a long time ago.
When people talk about contesting the future of nuclear power, they mean that there are different opinions about whether we should keep using nuclear power or not. Some people think that we should keep using it because it can help us make electricity and limit pollution. Other people think that we shouldn't use it anymore because it's too dangerous and can have really bad consequences if something goes wrong, like harm to people and the environment.
So, basically, there are different opinions about using nuclear power in the future, and people are arguing about whether it's safe and worth the risk or not.