Sure they own nuclear but they also own a great deal of hydroelectric. Their finances are very healthy because they essentially got 50 billion in assets from privatization of public assets including a great deal of very low maintenance hydroelectric generation and significant nuclear again without any upfront cost.
Things don’t look nearly as rosy when you consider they’re generating $1.20 billion in net profits off of 60 billion in assets - 10 billion in debt. Essentially without that massive initial subsidy they would be losing money hand over fist.